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Amplifier Circuit patents



      
           
This page is updated frequently with new Amplifier Circuit-related patent applications. Subscribe to the Amplifier Circuit RSS feed to automatically get the update: related Amplifier RSS feeds. RSS updates for this page: Amplifier Circuit RSS RSS


Signal processing device, and driving method and program thereof

Semiconductor Energy Laboratory

Signal processing device, and driving method and program thereof

Novel sense amplifier scheme

Taiwan Semiconductor Manufacturing Limited

Novel sense amplifier scheme

Novel sense amplifier scheme

Texas Instruments

Low noise capacitive sensor with integrated bandpass filter

Date/App# patent app List of recent Amplifier Circuit-related patents
02/26/15
20150055733
 High frequency circuit and high frequency module including the same patent thumbnailnew patent High frequency circuit and high frequency module including the same
A front-end circuit includes a power amplifier circuit, a low noise amplifier circuit, a connection switching circuit, a bypass circuit and an attenuation unit. The connection switching circuit switches connections in response to a control signal.
Sharp Kabushiki Kaisha
02/26/15
20150055426
 Novel sense amplifier scheme patent thumbnailnew patent Novel sense amplifier scheme
A sense amplifier circuit comprising a pair of cross-coupled inverters and a data line charging circuit is disclosed. The cross-coupled inverters comprise a first inverter and a second inverter.
Taiwan Semiconductor Manufacturing Company Limited
02/26/15
20150054772
 Low noise capacitive sensor with integrated bandpass filter patent thumbnailnew patent Low noise capacitive sensor with integrated bandpass filter
A bandpass sense amplifier circuit (fig. 2a) is disclosed.
Texas Instruments Incorporated
02/26/15
20150054553
 Pulse width modulation circuit and voltage-feedback class-d amplifier circuit patent thumbnailnew patent Pulse width modulation circuit and voltage-feedback class-d amplifier circuit
The frequency characteristic of a voltage-feedback class-d amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a pwm carrier to a comparison circuit for performing pwm modulation of an input signal.
Renesas Electronics Corporation
02/26/15
20150054550
 Signal processing device, and driving method and program thereof patent thumbnailnew patent Signal processing device, and driving method and program thereof
A power switch 307a is provided between a bias generation circuit 301 and a high potential power source, or a power switch 307b is provided between the bias generation circuit 301 and a low potential power source. A bias potential vb output from the bias generation circuit 301 is held by a potential holding circuit 300.
Semiconductor Energy Laboratory Co., Ltd.
02/19/15
20150049841
 Linearization of intermodulation bands for concurrent dual-band power amplifiers patent thumbnailLinearization of intermodulation bands for concurrent dual-band power amplifiers
Systems and methods are disclosed for digital predistortion for a concurrent multi-band transmitter that compensates for both in-band and out-of-band intermodulation products according to a memory polynomial based baseband model. In one embodiment, a concurrent multi-band transmitter includes a digital predistortion subsystem, power amplifier circuitry, and an adaptation subsystem.
Telefonaktiebolaget L M Ericsson (publ)
02/19/15
20150049565
 Apparatuses and methods for reducing current leakage in a memory patent thumbnailApparatuses and methods for reducing current leakage in a memory
Apparatuses, sense amplifier circuits, and methods for operating a sense amplifier circuit in a memory are described. An example apparatus includes a sense amplifier circuit configured to be coupled to a digit line and configured to, during a memory access operation, drive the digit line to a voltage that indicates the logical value of the charge stored by a memory cell coupled to the digit line.
Micron Technology, Inc.
02/19/15
20150048899
 Combiner circuit for a class-e outphasing power amplifier patent thumbnailCombiner circuit for a class-e outphasing power amplifier
Lumped-element based class-e chireix combiners are disclosed that are equivalents of a quarter-wave transmission line combiner. The proposed class-e equivalent power amplifier circuits that are used can be derived from a parallel tuned class-e implementation.
Nxp B.v.
02/19/15
20150048889
 Ultra-wideband low-noise amplifier circuit with low power consumption patent thumbnailUltra-wideband low-noise amplifier circuit with low power consumption
An ultra-wideband low-noise amplifier circuit with low power consumption includes a cascode amplifier circuit module and an output combining circuit module. The cascode amplifier circuit module receives an input signal, and outputs a first output signal and a second output signal.
National Chi Nan University
02/19/15
20150048887
 Amplifier circuit patent thumbnailAmplifier circuit
An amplifier circuit is configured in such a manner that the withstand voltage between the terminals of a fet 2 (withstand voltage b) is higher than the withstand voltage between the terminals of a fet 1 (withstand voltage a), and that the gate width of the fet 1 (wg1) is narrower than the gate width of the fet 2 (wg2). This makes it possible to increase the gain while maintaining high output power.
Mitsubishi Electric Corporation
02/19/15
20150048884

Amplifier circuits


Differential amplifier circuits for ldmos-based amplifiers are disclosed. The differential amplifier circuits comprise a high resistivity substrate and separate dc and ac ground connections.
Nxp B.v.
02/19/15
20150048820

Fluxgate magnetic sensor readout apparatus


Compact, low power fluxgate magnetic sensor readout circuits and apparatus are presented in which demodulator or rectifier circuit to modulates a sense signal from the fluxgate sense coil, and the demodulated signal is provided to an amplifier circuit with a transconductance or other amplifier and one or more feedback capacitors connected between the amplifier input and amplifier output to integrate the amplifier output current and provide a voltage output signal indicating the magnetic field sensed by the fluxgate sensor.. .
Texas Instruments Deutschland Gmbh
02/12/15
20150043743

High fidelity blast hearing protection


An improved hearing protection device intended to be inserted into an external auditory meatus of a user, having a housing structure, a passive tuning element, and a passive, nonlinear acoustic filter. The tuning element and the acoustic filter may be supported in series by the housing structure.
Applied Research Associates, Inc.
02/12/15
20150042566

Bipolar junction transistor pixel circuit, driving method thereof, and image sensor


A bipolar junction transistor (bjt) pixel circuit, an image sensor and a driving method thereof are provided. The bjt pixel circuit includes a bjt, a photodetector, a feedback amplifier circuit, a shutter circuit, and a current generating unit.
Pixart Imaging Inc.
02/12/15
20150042406

Peak-to-average ratio detector


An amplifier circuit with a peak-to-average ratio detector is described. Detection of the peak-to-average ratio value can be used to tune one or more parameters that affect linearity of one or more amplifiers in the amplifier circuit to improve amplifier performance..
Peregrine Semiconductor Corporation
02/12/15
20150042403

High-voltage voltage-switched class-s amplifier


A voltage-switched class-s amplifier circuit includes an output stage configured to receive at least one control signal and operative to generate an output signal as a function of the at least one control signal. The amplifier circuit further includes a driver circuit coupled with the output stage.
Lsi Corporation
02/05/15
20150035706

Antenna having flexible feed structure with components


Electronic devices may include antenna structures. The antenna structures may form an antenna having first and second feeds at different locations.
Apple Inc.
02/05/15
20150035607

Power amplifier module


Improvement in linearity is achieved at low costs in a power amplifier module employing an envelope tracking system. The power amplifier module includes a first power amplifier circuit that amplifies a radio frequency signal and that outputs a first amplified signal, a second power amplifier circuit that amplifies the first amplified signal on the basis of a source voltage varying depending on amplitude of the radio frequency signal and that outputs a second amplified signal, and a matching circuit that includes first and second capacitors connected in series between the first and second power amplifier circuit and an inductor connected between a node between the first and second capacitors and a ground and that decreases a gain of the first power amplifier circuit as the source voltage of the second power amplifier circuit increases..
Murata Manufacturing Co., Ltd.
02/05/15
20150035598

Common-mode feedback differential amplifier


The present invention discloses a common-mode feedback differential amplifier circuit, a common-mode feedback differential amplification method, and an integrated circuit. In an example, a common-mode feedback (cmfb) loop conducts voltage division on a first common-mode signal to generate a second common-mode signal and a third common-mode signal, a differential amplifier sets a voltage of the signal with the higher voltage between the second common-mode signal and the third common-mode signal equal to a voltage of a first input terminal or a second input terminal, and the cmfb loop controls the differential amplifier to output an output signal with the minimum voltage equal to the voltage of the first common-mode signal..
Fairchild Semiconductor Corporation
02/05/15
20150035593

Input power detecting arrangement and method


An amplifier circuit with an input power detector and a related method are described. With the input power detector and related control network, the arrangement enables and/or disables a number of unit cells in power amplifiers..
Peregrine Semiconductor Corporation
01/29/15
20150030184

Audio amplifier and power supply voltage switching method


An audio amplifier is provided with: an amplifier circuit; a power supply circuit that generates a plurality of power supply voltages; a power supply relay that selects one of the power supply voltages as the power supply voltage supplied to the amplifier circuit; a switching condition determiner that determines whether the switching condition of the power supply relay is satisfied; a silent section detector that detects a silent section of the audio signal which is equal to or greater than the operation time of the power supply relay; and a switching instruction unit for providing the power supply relay with an instruction for switching the power supply voltage during the silent section when the switching condition is satisfied and the silent section is detected.. .
Yamaha Corporation
01/29/15
20150029251

Fluid ejection device and fluid ejection printer with a power amplifier stopping section


A fluid ejection device includes: a modulator adapted to pulse-modulate a drive waveform signal forming a basis of a drive signal of an actuator to obtain a modulated signal; a digital power amplifier circuit adapted to power-amplify the modulated signal to obtain a power-amplified modulated signal; a low pass filter adapted to smooth the power-amplified modulated signal to obtain the drive signal; and a power amplification stopping section operating when holding a voltage of the actuator constant.. .
Seiko Epson Corporation
01/29/15
20150028958

Differential oscillator


A differential oscillator includes a resonator, a differential amplifier circuit, and a filter. The filter is disposed in parallel to the resonator and the differential amplifier circuit.
Nihon Dempa Kogyo Co., Ltd.
01/29/15
20150028952

Programmable multi-gain current amplifier


The programmable multi-gain current amplifier circuitry includes a pair of mos transistors setting the voltage at x terminal to zero using negative feedback formed by a third mos transistor. Input resistance is in the range of few tens of ohms.
King Fahd University Of Petroleum And Minerals
01/29/15
20150028951

Operational amplifier circuits


An implementation of an operational amplifier circuit includes a first stage amplifier circuit, a second stage amplifier circuit and a first feedforward circuit. The first stage amplifier circuit is coupled to a first input node for receiving a first input signal and amplifying the first input signal to generate a first amplified signal.
Mediatek Inc.
01/29/15
20150028926

Digitally controlled oscillator device and high frequency signal processing device


The present invention provides a digitally controlled oscillator device capable of realizing a reduction in dnl. The digitally controlled oscillator device includes, for example, an amplifier circuit block, coil elements and a plurality of unitary capacitor units coupled in parallel between oscillation output nodes.
Renesas Mobile Corporation
01/15/15
20150015339

Power amplifier architectures with input power protection circuits


An rf power amplifier circuit and input power limiter circuits are disclosed. A power detector generates a voltage output proportional to a power level of an input signal.
Rfaxis, Inc.
01/15/15
20150015333

Differential measurements with a large common mode input voltage


An apparatus comprises a differential amplifier circuit and a current source. The differential amplifier circuit is configured to receive a voltage at an input, wherein the differential amplifier circuit generates an output voltage having a magnitude proportional to the received voltage over a voltage range to be measured at a specified output common mode voltage.
Fairchild Semiconductor Corporation
01/15/15
20150015307

Comparator and amplifier


A comparator has a differential pair circuit and a current control circuit. The differential pair circuit has first and second comparator transistors, and is arranged to compare a first input and a second input according to a clock signal to generate a result indicating whether a difference of the first and second inputs exceeds an internal offset.
Mediatek Inc.
01/15/15
20150015270

Relative angle detection apparatus and electric power steering apparatus


A relative angle detection apparatus includes a first magnetometric sensor and a first voltage amplifier that output a signal corresponding to a relative rotation angle between a first rotation shaft and a second rotation shaft; a first amplifier circuit that amplifies the output signal of the first voltage amplifier; a second magnetometric sensor and a second voltage amplifier that output a signal that corresponds to the relative rotation angle; a second amplifier circuit that amplifies the output signal of the second voltage amplifier; a first resistor that is provided between the first amplifier circuit and a power supply terminal, or between the first amplifier circuit and a gnd terminal; and a second resistor that is provided between the second amplifier circuit and the power supply terminal, or between the second amplifier circuit and the gnd terminal.. .
Showa Corporation
01/08/15
20150008984

Circulator power amplifier circuit and design method therefor


The present invention provides a circulator power amplifier circuit and a connection method thereof. Wherein, the circulator power amplifier circuit includes a power amplifier, a circulator, a power load and a load.
Zte Corporation
01/08/15
20150008981

Repair operational amplifier circuit and operating method thereof


A repair operational amplifier circuit including a repair operational amplifier and a slew rate enhancing module. The repair operational amplifier includes an input terminal and an output terminal.
Raydium Semiconductor Corporation
01/08/15
20150008969

Semiconductor integrated circuit


According to one embodiment, a semiconductor integrated circuit includes a clock signal transmission path configured to transmit a clock signal and a data transmission path configured to transmit data. The clock signal transmission path has a first and a second clock signal transmission line configured to transmit a clock signal and a complementary clock signal.
Kabushiki Kaisha Toshiba
01/01/15
20150002061

Motor driving curcuit and permanent magnet synchronous motor


A motor driving circuit includes a magnetic-pole-position detecting unit that detects a rotating position of a rotor of a permanent magnet synchronous motor, a voltage output unit that converts a direct-current voltage and generates a driving voltage for the permanent magnet synchronous motor, a voltage control unit that controls the voltage output unit on the basis of a comparison result of a modulation wave and a carrier wave, a voltage-phase adjusting unit that determines, using a differential amplifier circuit that receives a rotating speed control signal and an offset signal, a phase of the modulation wave generated by the voltage control unit and causes the voltage control unit to generate the modulation wave in the determined phase, and an offset generating unit that generates the offset signal.. .
Mitsubishi Electric Corporation
12/25/14
20140375390

Power amplifier with improved low bias mode linearity


Power amplifier circuitry includes a power amplifier including an input node and an output node, biasing circuitry, a selectable impedance network, and an input capacitor. The input capacitor is coupled to the input node of the power amplifier.
Rf Micro Devices, Inc.
12/25/14
20140375386

Low-noise amplifier circuit


The low-noise amplifier circuit exhibits reduced noise.. .
St-ericsson Sa
12/25/14
20140375385

Differential amplifier circuit


Aspects of the invention include a differential amplifier circuit with a differential amplifier operated with a first power supply voltage applied thereto to amplify a differential voltage between paired input voltages, an inverting amplifier operated with a second power supply voltage applied thereto to carry out inverting amplification of the output of the differential amplifier and output the amplified output to the outside, and a voltage step-up circuit producing the first power supply voltage higher than the second power supply voltage from the second power supply voltage and applying the produced first power supply voltage to the differential amplifier. This satisfies at one time the requirement for producing the high power supply voltage necessary for the differential amplifier and the requirement for securing the power supply current necessary for the inverting amplifier on the basis of the externally supplied second power supply voltage..
Fuji Electric Co., Ltd.
12/18/14
20140369111

Semiconductor memory device and driving the same


In a conventional dram, when the capacitance of a capacitor is reduced, an error of reading data easily occurs. A plurality of cells are connected to one bit line mbl_m.
Semiconductor Energy Laboratory Co., Ltd.
12/18/14
20140368369

Delta-sigma modulator with high input impedance


Measurement circuits having a delta-sigma modulator are disclosed. One example measurement circuit includes a low pass filter coupled to receive an input voltage, a switched-capacitor integrator circuit, and a switched comparator circuit.
Power Integrations, Inc.
12/18/14
20140368279

Direct biasing a gate electrode of a radio frequency power amplifier through a driver stage


A radio frequency (rf) circuit includes an amplifier circuit comprising at least one transistor amplifier having first, second, and third terminals. The rf circuit additionally includes a driver circuit comprising an enhancement-mode transistor and a depletion-mode transistor coupled in a cascade configuration having an upper portion and a lower portion, the driver circuit having an output coupled to an input of the amplifier circuit such that the driver circuit is capable of providing pulsed signals as well as a direct-current (dc) bias current to at least one terminal of a transistor amplifier of the amplifier circuit.
Auriga Measurement Systems, Llc
12/18/14
20140368271

Amplifier circuit with overshoot suppression


An amplifier circuit with overshoot suppress scheme including an input amplifier, an output amplifier, and a diode is provided. A first and a second input ends of the output amplifier are coupled to an output of the input amplifier.
Novatek Microelectronics Corp.
12/18/14
20140368268

Load tuning circuit for pulse-width / pulse-position modulation amplifier and related techniques


A pulse width modulated/pulse modulated pwm/ppm power amplification circuit includes a load modulation circuit coupled between an output of the amplification circuit and a load. In one embodiment, the load modulation circuit comprises a plurality of capacitor elements switchably coupled such that in response to a control signal provided the load modulation circuit presents one of a plurality of different capacitance values at a terminal thereof.
Auriga Measurement Systems, Llc
12/18/14
20140367557

Optical receiver module


An optical detector module includes a carrier, a photodetector secured to a top surface of the carrier and having a light detecting portion, an anode terminal, and a cathode terminal, an amplifier circuit secured to the top surface of the carrier and having a first edge, an input terminal, and a gnd terminal. The input terminal and the gnd terminal are located along the first edge.
Mitsubishi Electric Corporation
12/04/14
20140354360

High frequency module and portable terminal using same


When the frequency bandwidth of a high frequency signal to be amplified is changed, the linearity of a high frequency module deteriorates. A high frequency module has an amplifier circuit including an amplification transistor and a variable impedance circuit, and an output matching network.
12/04/14
20140354261

Method, circuit and integrated circuit for detecting resonance frequency


A method, circuit, and integrated circuit for detecting resonance frequency is disclosed in which a first operational amplifier circuit receives an input signal and provides an output signal for a resonance circuit to store energy, a zero crossing comparator circuit samples a discharge current of the resonance circuit and transforms the sampled current into a sampled voltage and outputs a square signal to a digital signal processor based on the sampled voltage, and the digital signal processor obtains a resonance frequency based on the square signal.. .
12/04/14
20140354249

Voltage regulator


Provided is a voltage regulator having satisfactory transient response characteristics. The voltage regulator includes: a first amplifier for detecting that undershoot occurs in an output voltage; a second amplifier for detecting that overshoot occurs in the output voltage; a first constant current circuit for increasing a bias current of an error amplifier circuit by a first amount for a first time period in response to a signal determined based on one of an output signal of the first amplifier and an output signal of the second amplifier; a second constant current circuit for increasing the bias current of the error amplifier circuit by a second amount larger than the first amount for a second time period shorter than the first time period in response to a signal determined based on the output signal of the first amplifier; and a first switch circuit for pulling up a gate of an output transistor in response to a signal determined based on the output signal of the second amplifier..
11/27/14
20140347204

High speed dynamic comparator


A comparator circuit (fig. 4) is disclosed.
11/27/14
20140347124

Power amplifier control circuits


Circuits for reducing power consumption in power amplifier circuits are disclosed. In certain embodiments, a circuit for power control in the transmitter includes a coupling circuit, a first power amplifier circuit and a second power amplifier circuit.
11/27/14
20140347022

Voltage regulator


Provided is a voltage regulator capable of accurately adjusting a tail current of a differential amplifier circuit without adding a test terminal. The voltage regulator includes: a constant current circuit for causing the tail current of the differential amplifier circuit to flow; a protection circuit; a current output circuit for outputting a current of the constant current circuit to a test terminal for measuring characteristics of the protection circuit; a switch circuit for stopping a function of the protection circuit; and a fuse provided between the test terminal and the current output circuit..
11/20/14
20140341261

Transmitter


Embodiments of the present invention provide a transmitter including a plurality of amplifier circuits, a plurality of antennas adapted to have different main transmit directions and a transformation unit. The transformation unit includes a plurality of inputs connected to the plurality of amplifier circuits and a plurality of outputs connected to the plurality of antennas.
11/20/14
20140340385

Digital-to-analog converter circuit and display driver


Provided first and second reference voltage set wherein the first reference voltage set includes a part or all of reference voltages of the second reference voltage set, and a decoder including first and second sub-decoder sections that select q reference voltages from first and second reference voltage sets according to upper bits of the input digital signal and transfer the so selected reference voltages to the first to qth nodes, and third and fourth sub-decoder sections that select first and second voltages from the q reference voltages transferred to the first to qth nodes according to lower bits of the input digital signal and transfer the so selected voltages to the first to pth nodes. The first and third sub-decoder sections are made up of first conductivity type transistors, whilst the second and fourth sub-decoder sections are made up of second conductivity type transistors.
11/20/14
20140340147

Amplifier circuit and amplification method


A true ground amplifier circuit in which a voltage sensor senses the output voltage and generates a binary output which indicates whether the output is above or below a threshold. A variable gain feedback system generates a feedback signal for combination with the digital input, thereby to provide offset cancellation.
11/20/14
20140340145

Signal processing circuit, resolver digital converter, and multipath nested mirror amplifier


A signal processing circuit includes a chopper amplifier that has a differential amplifier circuit that amplifies differential input signals vsp(t) and vsm(t), and an adder circuit that generates an addition signal vfil(t) by addition of the chopper output signal vsub(t) that the chopper amplifier generates. Differential signals inputted into the differential amplifier circuit are interchanged for every first phase period and second phase period, and the adder circuit generates the addition signal by addition of the chopper output signal in the first phase period and in the second phase period..
11/20/14
20140339432

Amplifier circuit and image sensor using amplifier


There is a problem that in an image sensor including an amplifier in each pixel, when a thin-film semiconductor is used as a transistor constituting the amplifier, voltage continues to be applied between source and gate of the transistor and thereby a threshold voltage value of the transistor varies, resulting in a variation of signal voltage. To solve the problem, a thin-film transistor formed with an oxide semiconductor is used as the transistor constituting the amplifier, and during a period other than a period of outputting an output of the amplifier, source potential of the transistor is controlled to be equal to drain potential thereof..
11/13/14
20140334240

Semiconductor integrated circuit device


An output signal characteristic of a differential amplifier circuit is improved. When an input data signal becomes ‘low’, current flowing through a first transistor will decrease and potential at a connection (a node) between a first resistor and a second resistor will increase.
11/13/14
20140334238

Low power memory device


A method of operation within a memory device is disclosed. The method comprises receiving address information and corresponding enable information in association with a memory access request.
11/13/14
20140333384

Circuits and methods related to low-noise amplifiers having improved linearity


Disclosed are circuits and methods related to low-noise amplifiers (lnas) having improved linearity. In some embodiments, a radio-frequency (rf) amplifier circuit can include a first amplifying transistor configured to amplify an rf signal.
11/13/14
20140333292

Self-shielded di/dt transformer for a meter


A sensor includes a core, first and second windings, an integrating amplifier circuit and a dc balancing circuit. The first and second windings are wrapped around the core.
11/06/14
20140327483

Complementary metal oxide semiconductor power amplifier


An rf power amplifier circuit is disclosed. A driver amplifier stage includes a first set of a plurality of amplifier transistors in a cascode configuration, a driver amplifier stage input, and a driver amplifier stage output.
10/30/14
20140323838

Electrocardiographic waveform measuring apparatus


An electrocardiographic waveform measuring apparatus mounted in a seat with a seat skin element includes: a sensor electrode at a seat interior side of the seat to be covered with the seat skin element; an insulating elastic element at the seat interior side of the sensor electrode in the seat opposite to the seat skin element to face the sensor electrode; a guard electrode at the seat interior side of the insulating elastic element in the seat opposite to the sensor electrode to be opposed to the sensor electrode through the insulating elastic element; and a housing case at the seat interior side of the insulating elastic element in the seat opposite to the sensor electrode to be opposite to the insulating elastic element. The housing case accommodates a sensor circuit with an amplifier circuit, to which a potential signal of the sensor electrode is initially input..
10/30/14
20140320213

Radio frequency power amplifier circuit and method


An amplifier circuit is disclosed for providing a radio frequency output signal having a variable signal envelope, comprising a main amplifier device and an auxiliary amplifier and a combiner network for combining an output signal from said first amplifier device and a second output signal from said second amplifier device to provide a combined output signal of variable signal envelope to a load, and a signal processing circuit comprising an input and a non-linear processing section to provide at least said second radio frequency output signal with a signal envelope that has a non-linear dependency from an amplitude characteristic of the input signal such that the degree of non-linearity of the non-linear dependency varies dependent on the amount of change per time unit of the amplitude characteristic of the input signal. Further, a method of power amplifying a radio frequency signal having a variable signal envelope is disclosed..
10/30/14
20140320151

Tamper detection arrangement


A tamper detection arrangement for use within an integrated circuit (1), the arrangement comprising: at least one input capacitor (4) having a first capacitance value; a feedback capacitor (5) having a second capacitance value; a sensing arrangement comprising an amplifier circuit having the at least one input capacitor as an input and the at least one feedback capacitor in a feedback loop across the amplifier operable to detect a change in the capacitance values between the at least one input capacitor and the feedback capacitor; and a protective shield to protect a sensitive area (2) of the integrated circuit from tampering, the shield being provided by the at least one input capacitor (4).. .
10/30/14
20140320033

Dimmable screw-in compact fluorescent lamp having integral electronic ballast circuit


A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of a lamp tube in response to a phase-control voltage received from a dimmer switch. The ballast circuit generates a lamp current through the lamp tube having a substantially constant envelope such that flicker in the lamp tube and electromagnetic interference (emi) noise on an ac voltage supply are minimized.


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Amplifier Circuit topics: Amplifier Circuit, Semiconductor, Differential Amplifier Circuit, Differential Amplifier, Memory Cells, Semiconductor Device, Memory Cell, Semiconductor Substrate, Photodiode, Signal Processing, Memory Effect, Electronic Device, Electrical Signal, Storage Device, Communications

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