|| List of recent Amplifier Circuit-related patents
| Semiconductor memory device and method for 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.
| 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.
| 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.
| 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.
| 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.
| 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.
|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.
|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.. .
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..
|High speed dynamic comparator|
A comparator circuit (fig. 4) is disclosed.
|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.
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..
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.
|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.
|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.
|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..
|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..
|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.
|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.
|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.
|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.
|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.
|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..
|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..
|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).. .
|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.
A high-frequency module includes a wiring substrate including an electrode pattern layer and a via electrode, a plurality of amplifier circuits that are configured to respectively amplify signals in different frequency bands received at the input terminal, and a plurality of matching circuits and a plurality of filter circuits that are provided in correspondence with the respective amplifier circuits and that are connected sequentially to output sides of the respective amplifier circuits. A plurality of signal paths that extend from the output sides of the respective amplifier circuits to the antenna terminal through the corresponding matching circuits and the filter circuits are provided.
|High-frequency amplifier circuit, semiconductor device, and magnetic recording and reproducing device|
A high-frequency amplifier circuit includes a balanced-unbalanced converter converting a single-ended signal into differential signals. The output of a first amplifier amplifying the single-ended signal is connected to the signal terminal on the unbalanced side of the balanced-unbalanced converter.
|Differential amplifier circuit|
A differential amplifier circuit includes a differential amplification unit suitable for amplifying difference between signals of an input terminal and a complementary input terminal, receiving the same voltage level through the input terminal and the complementary input terminal at a measurement period, and receiving an input signal and a complementary input signal through the input terminal and the complementary input terminal, respectively, at an operation period, an offset control unit suitable for generating offset information using an output of the differential amplification unit at the measurement period, and an offset compensation unit suitable for compensating for an offset of the differential amplification unit in response to the offset information.. .
|Operational amplifier circuit|
An operational amplifier circuit including a main circuit, a compensation capacitor, a power circuit, and a set of switches is disclosed. The main circuit has an output terminal.
|Integrated rf front end with stacked transistor switch|
A monolithic integrated circuit (ic), and method of manufacturing same, that includes all rf front end or transceiver elements for a portable communication device, including a power amplifier (pa), a matching, coupling and filtering network, and an antenna switch to couple the conditioned pa signal to an antenna. An output signal sensor senses at least a voltage amplitude of the signal switched by the antenna switch, and signals a pa control circuit to limit pa output power in response to excessive values of sensed output.
|Circuits and methods for compensating for miller capacitance|
Amplifier circuits and methods of cancelling the miller effects in amplifiers are disclosed herein. An embodiment of an amplifier circuit includes an input and an output.
|Apparatus and method for transimpedance amplifiers with wide input current ranges|
Improved preamplifier circuits for converting single-ended input current signals to differential output voltage signals, including first and second transimpedance amplifiers with input transistors operating according to bias currents from a biasing circuit, output transistors and adjustable feedback impedances modified using an automatic gain control circuit, as well as a reference circuit controlling the bias currents according to an on-board reference current and the single-ended input or the differential output voltage signals from the transimpedance amplifiers.. .
|Power amplifier circuit based on a cascode structure|
A power amplifier circuit based on a cascode structure and to be powered by a power source voltage, e.g. A battery, said circuit comprising—a first transistor having a grid, source and drain terminal; said first transistor being connected in a common source mode;—a second grid source transistor having grid, source and drain terminal, said second transistor being connected in common grid mode;—a biasing circuit for biasing said first transistor and said second transistor.
|Amplifiers with boosted or deboosted source degeneration inductance|
Amplifiers with boosted or deboosted source degeneration inductance are disclosed. In an exemplary design, an apparatus includes an amplifier circuit and a feedback circuit.
|Operational amplifier circuit|
Aspects of the invention include an operational amplifier circuit having a construction of a rail-to rail input folded circuit and includes an n-mos differential pair composed of a pair of n-channel type mos-fets connected to a pair of voltage input terminals, and a p-mos differential pair composed of a pair of p-channel type mos-fets connected to the pair of voltage input terminals. In some aspects, a comparator determines whether an common mode input voltage to the n-mos differential pair and the p-mos differential pair is higher than a half of a power supply voltage or not, and either one of the n-mos differential pair and the p-mos differential pair is selectively operated according to the comparison result.
|Operational amplifier circuit|
In aspects of the invention, an operational amplifier circuit includes: an n-mos auxiliary current source connected in parallel to the n-mos differential pair, the n-mos auxiliary current source turning on when the n-mos differential pair turns off caused by a decreased common mode input voltage given to the pair of voltage input terminals, drawing a current from the active load for the p-mos differential pair. Aspects of the invention also include a p-mos auxiliary current source connected in parallel to the p-mos differential pair, the p-mos auxiliary current source turning on when the p-mos differential pair turns off caused by an increased common mode input voltage given to the pair of voltage input terminals, delivering a current to the active load for the-n-mos differential pair..
|Signal processing device|
A level shifter converting a binary signal having a first potential and a second potential into a signal having the first potential and a third potential, and a signal processing circuit using the level shifter are provided. The first potential is higher than the second potential.
|Power amplifier and communication device|
A power amplifier, includes: a first and a second amplifier circuits that are controlled so that one of them do not amplify a signal when another one of them amplifies the signal; a first impedance conversion circuit, coupled between the first amplifier circuit and the output terminal, that converts an output impedance of the first amplifier circuit; a second impedance conversion circuit, coupled between the second amplifier circuit and a wiring coupling the first impedance conversion circuit and the output terminal, that converts an output impedance of the second amplifier circuit; and a connection circuit that, when the first amplifier circuit amplifies the signal, forms a path which bypasses the second impedance conversion circuit between a reference potential and the wiring coupling the first impedance conversion circuit and the output terminal, by coupling a wiring coupling the first amplifier circuit and the output terminal, with the reference potential.. .
|Sense amplifier circuit and semiconductor device|
A single-ended sense amplifier circuit of the invention comprises first and second mos transistors and first and second precharge circuits. The first mos transistor drives the bit line to a predetermined voltage and switches connection between the bit line and a sense node and the second mos transistor whose gate is connected to the sense node amplifies the signal via the first mos transistor.
|Folded cascode amplifier circuit|
A folded cascode amplifier circuit includes: an input stage having a pair of transistors and configured to output a positive phase intermediate signal and an opposite phase intermediate signal; a cascode amplification stage having pairs of transistors connected in multiple stages, to which the positive phase intermediate signal and the opposite phase intermediate signal are supplied, and which is configured to output a positive phase output signal and an opposite phase output signal, which are differential signals; a first capacitor connected between a signal line of the positive phase intermediate signal and a signal line of the opposite phase output signal; and a second capacitor connected between a signal line of the opposite phase intermediate signal and a signal line of the positive phase output signal.. .
|Method and system for a feedback transimpedance amplifier with sub-40khz low-frequency cutoff|
A system for a feedback amplifier with sub-40khz low-frequency cutoff is disclosed and may include amplifying electrical signals received via coupling capacitors utilizing an amplifier having feedback paths comprising source followers and feedback resistors. Gate terminals of the source followers may be coupled to output terminals of the amplifier circuit.
|Radio communication device, transmission circuit and buffer circuit|
According to one embodiment, a buffer circuit has a capacitor comprising a first terminal and a second terminal, an input signal being inputted to the first terminal, a first inverting amplifier circuit configured to invert and amplify a signal of the second terminal of the capacitor, a second inverting amplifier circuit configure to invert and amplify an output signal of the first inverting amplifier circuit, and a mos (metal oxide semiconductor) transistor comprising a third terminal, a fourth terminal and a gate, the third terminal being connected to the second terminal of the capacitor, the fourth terminal being connected to a connection node of the first and the second inverting amplifier circuits, an inversion signal of the input signal being inputted to the gate.. .
|Non-volatile semiconductor memory device|
According to one embodiment, a non-volatile semiconductor memory device which is provided with a memory cell array, bit lines, word lines, and a sense amplifier circuit is presented. The memory cell array includes memory cells.
|Non-volatile semiconductor memory device|
A non-volatile semiconductor memory device includes a memory cell configured to allow electrical writing and erasing, a bit line configured to transmit a potential corresponding to data stored in the memory cell in a column direction, a sense amplifier circuit configured to detect a potential of the bit line, and a bit line coupling circuit coupled between the bit line and the sense amplifier circuit. The bit line coupling circuit includes a first bit line coupling transistor in an outer layout area of the bit line coupling circuit and a second bit line coupling transistor in an inner layout area of the bit line coupling circuit.
|Piezoelectric element drive circuit|
A piezoelectric element drive circuit includes an h bridge circuit, an lpf-attached differential amplifier circuit, an amplifier circuit, and an inverter circuit. First and second drive signals output from the h bridge circuit and having opposite phases are applied to a piezoelectric element.
|Feedback mechanism for boost-on-demand amplifiers|
A method and an amplifier for amplifying audio signals include a signal processor for processing incoming audio samples in preparation for amplification by an electronic amplifier circuit. A voltage is received from a power supply.
A method and an amplifier for amplifying audio signals receive and process an incoming audio sample in preparation for amplification by an electronic amplifier circuit. A boost supply circuit receives a voltage from a power supply.
|Buffer amplifier circuit|
Amplifier circuits implemented with a buffer amplifier with a voltage gain substantially equal to one. In one example, a continuous-time amplifier is implemented by applying the input source across the input and the output terminals of the buffer amplifier.
|Apparatus and method for asymmetrically driven partial outphasing power amplifier|
Apparatus and method embodiments are provided for improving power efficiency in an outphasing amplifier with a non-isolating combiner. The embodiments include reducing the driving power to two power amplifiers (pas) of the amplifier circuit in the low input signal power region in an asymmetric manner between the two pas.
|Split amplifiers with improved linearity|
Split amplifiers with configurable gain and linearization circuitry are disclosed. In an exemplary design, an apparatus includes first and second amplifier circuits and a linearization circuit, which may be part of an amplifier.
|High-frequency, broadband amplifier circuit|
According to one embodiment, a high-frequency, broadband amplifier circuit includes two drive elements, a matching circuit, a balun circuit, a power supply, and a power supply circuit. The matching circuit includes two pattern circuits.
|Ionized gas detector and ionized gas detecting method|
An ionized gas detector includes at least a pair of ion detecting electrodes that detect ions of the ionized measuring-subject gas, an electrode-voltage applying unit that applies a given voltage to the ion detecting electrodes, the electrode-voltage applying unit being configured to be capable of reversing its voltage polarity, a charge amplifier circuit having a charge capacitor that accumulates electric charges generated by voltage application by the electrode-voltage applying unit, an ion current calculating unit that calculates the value of an ion current of ions of the measuring-subject gas, based on a time-dependent change of the volume of electric charges accumulated in the charge capacitor of the charge amplifier circuit, and a concentration determining unit that determines the concentration of the measuring-subject gas, based on an ion current value calculated by the ion current calculating unit.. .
|Single supply amplifier with swing to ground|
An amplifier circuit has a voltage input terminal, for receiving vin, and a voltage output terminal, for outputting vout. A feedback circuit controls vout to match vin.
|Asymmetrical slow wave structures to eliminate backward wave oscillations in wideband traveling wave tubes|
In various embodiments, a traveling wave amplifier circuit is disclosed. The traveling wave amplifier circuit is configured to receive an rf wave and an electron beam.
An amplifier circuit includes: a first filter that receives input of amplitude information of an input signal, and performs filtering so that a gain of a frequency component higher than a first cutoff frequency becomes greater than a gain of a frequency component lower than the first cutoff frequency; a power supply circuit that has a low-pass filter characteristic that a gain of a frequency component lower than a second cutoff frequency is greater than a gain of a frequency component higher than the second cutoff frequency, and receives input of amplitude information outputted from the first filter and generates a power supply voltage corresponding to the amplitude information outputted from the first filter; and an amplifier that receives supply of the power supply voltage generated by the power supply circuit, and amplifies a signal based on the input signal.. .
|Electronic ballast circuit for lamps|
An electronic ballast circuit includes a power factor correction circuit, a control and amplifier circuit, a ballast controller circuit and a ballast driver circuit. The ballast driver circuit includes a resonant circuit that connects to a lamp and a strike voltage limiter circuit that regulates the behavior of the resonant circuit.
|Analog-to-digital converter and solid-state imaging device|
An adc includes a comparator and first and second amplifier circuits including a fully-differential operational amplifier. The comparator converts an analog signal output from the operational amplifier into digital data.
|Level conversion circuit, multi-value output differential amplifier, and display unit|
A level conversion circuit includes: a multi-value output differential amplifier circuit including an inverting input section, an output section, and two or more non-inverting input sections; and an offset cancelling circuit configured to store, on each of a plurality of capacitors, an offset voltage that arises on each of the two or more non-inverting input sections of the multi-value output differential amplifier circuit, and subtract the offset voltages from an output voltage of the output section.. .
|Adaptive biasing technique for audio circuitry|
A circuit comprising a peak detector configured to receive a positive voltage input, a negative voltage input and a reference current source input and to output a peak signal data value. A fast attack current source control coupled to the peak detector and configured to generate a current source control signal as a function of the peak signal data value.