 Patent Application Title |
Patent App Num. |
Date |
| Driving circuit of display element and image display apparatus | 20130127812 | 20130523 |
 A new driving circuit is provided. The driving circuit according to the present invention comprises a first period for setting a current to be supplied to a display element, a second period for setting a gray-scale of the display element, and a third period for supplying a driving current to the display element. The present invention, in the driving circuit of the display element, is provided with a current source circuit for supplying a constant current to the display element and a control circuit for controlling the time to supply a constant current to the display element from the current source circuit.
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| Solid-state imaging apparatus and method for driving solid-state imaging apparatus | 20130119235 | 20130516 |
 A solid-state imaging apparatus includes: a plurality of pixels each configured to output a signal generated by a photoelectric conversion via a source follower circuit; an output line connected to the plurality of pixels; a current source circuit portion for supplying a current to the output line; and a first amplifier unit configured to clamp a signal from the output line of the pixel at a reset state to a clamping capacitor, and to amplify thereafter the signal from the output line of the pixel at a non-reset state, wherein the current source circuit portion changes from a state of supplying no current to the output line to a state of supplying the current to the output line before a timing of terminating the clamping of... |
| Reference current source circuit and system | 20130106392 | 20130502 |
 A reference current source circuit includes a reference voltage generating module, a voltage buffer, an equivalent resistance, a filter capacitor, a current mirror module and a reference current outputting terminal. The voltage buffer includes an operational amplifier and a first FET. The current mirror module includes a second FET and a third FET. The equivalent resistor includes an oscillator, a fourth FET, a fifth FET and a capacitor connected to the fourth FET and the fifth FET. The oscillator is for generating a clock signal whose frequency is related to a charging and discharging capacitor in the oscillator to control charging and discharging of the capacitor in the equivalent resistance. The reference current outputting terminal is for outputting a reference current only related to a capacitance... |
| Current source circuit with high order temperature compensation and current source system thereof | 20130099769 | 20130425 |
 A current source circuit with high order temperature compensation, includes a reference voltage terminal, a first power module, a second power module, a control module, a current source output module and a bias current source module. The control module includes a first field-effect tube (FET), a second FET, and a third FET. The bias current source module includes a first bias current source and a second bias current source. The current source output module includes a fourth FET, a fifth FET, and an output terminal. The first power module includes a first comparator, a sixth FET, a first resistor and a second resistor. The second power module includes a second comparator, a seventh FET, a third resistor, and a fourth resistor. A current source system with... |
| Semiconductor device, display device and electronic device | 20130092990 | 20130418 |
 When writing a signal current from a current source to a current source circuit, noise occurs in some cases in a wiring through which a current flows, which may cause a potential of the wiring to be outside the normal range. As the potential does not turn back within the normal range easily at this time, writing to the current source circuit is delayed. According to the invention, when the potential becomes outside the normal range due to noise occurring in a wiring through which a current flows when writing a signal current from a current source to a current source circuit, a current is supplied from other than the current source, thereby the potential of the wiring can turn back within the normal range rapidly.
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| Output circuit, data driver, and display device | 20130088473 | 20130411 |
| An output circuit is capable of supporting a high-speed operation, suppressing power consumption, and controlling its area. The output circuit has a differential input stage, an output amplification stage, and an amplification boost circuit, in which the amplification boost circuit has a differential pair of a second conductivity type and load element pair, and includes a first current source circuit for controlling current supply to an input node of a second current mirror circuit of the differential input stage and boost the charging operation of the output amplification stage according to a voltage difference between input and output voltages, and a second current source circuit for controlling current supply to an output node of a first current mirror circuit of the differential input stage and boost... |
| Signal line driving circuit and light emitting device | 20130032867 | 20130207 |
| The invention relates to a signal line driving circuit having a first and a second current source circuits, a shift register, and a constant current source for video signal, in which the first current source circuit is disposed in a first latch and the second current source circuit is disposed in a second latch. The first current source circuit includes capacitive means for converting the current supplied from the constant current source for video signal into a voltage, according to a sampling pulse supplied from the shift register, and supplying means for supplying the current corresponding to the converted voltage.
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| Clock and data recovery system, phase adjusting method, and phasedetector | 20120293226 | 20121122 |
| Disclosed is a phase discriminator, including: a first XOR gate connected to a trigger and a delay unit, a second XOR gate connected to the trigger and a latch, wherein the first XOR gate is a current mode logic XOR gate, the first XOR gate comprises a first offset current source circuit outputting a first adjustable offset circuit for controlling amplitude of the error signal output by the first XOR gate; and/or, the second XOR gate is a current mode logic XOR gate, the second XOR gate comprises a second offset current source circuit outputting a second adjustable offset circuit for controlling amplitude of reference signal output by the second XOR gate. Also disclosed are a clock and data recovery system and a phase adjustment method.... |
| Power control for linear and class ab power amplifiers | 20120293264 | 20121122 |
| Aspects of a system for improving efficiency over power control for linear and class AB power amplifiers may include a current source circuit that enables determination of a bias current level for a PA circuit within an IC die based on an amplitude of an input modulation signal. The PA circuit may enable generation of an output signal based on a differential input signal and the input modulation signal to the current source circuit. A generated bias voltage may be applied to a transformer external to the IC die, but internal to an IC package containing the IC die and/or a circuit board containing the IC package. One or more amplifier bias voltage levels may be applied to the PA circuit wherein the amplifier bias voltage... |
| Power amplifiers with improved efficiency over power control | 20120293266 | 20121122 |
| Aspects of a system for improving efficiency over power control for linear and class AB power amplifiers may include a current source circuit that enables determination of a bias current level for a PA circuit within an IC die based on an amplitude of an input modulation signal. The PA circuit may enable generation of an output signal based on a differential input signal and the input modulation signal to the current source circuit. A generated bias voltage may be applied to a transformer external to the IC die, but internal to an IC package containing the IC die and/or a circuit board containing the IC package. One or more amplifier bias voltage levels may be applied to the PA circuit wherein the amplifier bias voltage... |
| Semiconductor device | 20120286697 | 20121115 |
| A voltage at each terminal of a transistor is adjusted by a feedback circuit using an amplifier circuit. A current Idata is input from a current source circuit to the transistor, and a gate-source voltage is set by the feedback circuit so that the transistor can flow the current Idata. The feedback circuit controls the transistor to operate in a saturation region. Thus, a gate voltage required for flowing the current Idata is set. With the use of the set transistor, a current can be supplied to a load (EL pixel and signal line) with accuracy. Note that a desired gate voltage can be set quickly since the amplifier circuit is utilized.
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| Current source circuit | 20120249187 | 20121004 |
| According to one embodiment, a current source circuit comprises a first circuit, a second circuit, and a current synthesizing circuit. The first circuit generates a first current having a positive temperature characteristic. The second circuit includes a feedback circuit configured to receive a first voltage having a negative temperature characteristic, and output a second voltage equal to the first voltage, and generates a second current having the negative temperature characteristic based on the second voltage. The current synthesizing circuit generates a constant current having an arbitrary temperature characteristic by adding the first and second currents.
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| Signal line driver circuit and light emitting device and driving method therefor | 20120235974 | 20120920 |
| The variation of characteristics of transistors occurs. The present invention is a signal line drive circuit having a plurality of current source circuit corresponding to a plurality of wirings, a first and a second shift registers, a latch circuit, the foregoing plurality of current source circuits have capacity means and supplying means, respectively, characterized in that the foregoing capacity means converts a supplied current into a voltage according to a sampling pulse supplied from the foregoing first shift register, the foregoing supplying means supplies a current corresponding to the foregoing converted voltage according to a video signal, and the foregoing latch circuit operates according to a sampling pulse supplied from the foregoing second shift register.
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| Power-on reset circuit and electronic device having the same | 20120229183 | 20120913 |
| A power-on reset circuit includes a current source circuit supplying a current that varies according to a temperature to a first node, a first transistor connected between the first node and a ground voltage and having a gate connected with a power supply voltage, and an output circuit connected with the first node and outputting a power-on reset signal in response to a signal applied to the first node.
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| Current driving circuit | 20120212261 | 20120823 |
| A current driving circuit includes a constant current source circuit delivering a driving current to a load, and an output voltage difference amplifier circuit detecting a voltage change produced at a load driving end during a preset time period and delivering a current or a voltage corresponding to the voltage change to the load during a time period different from the preset time period. During first time period, capacitance circuit compares potential during a preceding time period to that during the current time period, and causes a potential at the load driving end during the current time period to store in any of capacitance elements depending on result of comparison. The amplifier circuit buffering an average value of the potential values stored in the capacitance elements... |
| Differential logic circuit, frequency divider, and frequency synthesizer | 20120169372 | 20120705 |
| A differential logic circuit including a current source circuit which is connected to a current control terminal and generates a current, the current value is controlled by a signal received from the current control terminal, a differential unit which, based on the current from the current source circuit, inputs a plurality of logic signals, performs a logic operation, and outputs a result of the logic operation from a pair of differential signal output terminals thereof, a load circuit which is connected to the pair of differential signal output terminals, and a load control circuit which monitors a change of the current value and controls a load of the load circuit based on a result of the monitoring.
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| Reference voltage generating apparatus and method | 20120161744 | 20120628 |
| A method and apparatus for generating a low reference voltage having low power consumption characteristics is provided. A reference voltage generating apparatus includes a constant current source circuit which generates a reference current. A load circuit is connected to the constant current source circuit and generates a voltage which is proportional to the reference current. A current branch circuit removes a portion of temperature-invariant current components included in the reference current from a connection terminal of the constant current source circuit and the load circuit to a ground terminal through a current branch which is different from a current branch of the load circuit.
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| Driving transistor control circuit | 20120112802 | 20120510 |
| A control circuit controls a driving transistor connected in series with an electrical load between a power supply voltage and a ground. The control circuit includes a pull-up resistor connected at one end to a power supply voltage side of the driving transistor, a current detection resistor for detecting an electric current flowing from the driving transistor to the ground, a current mirror circuit including a starting transistor connected between the pull-up transistor and the current detection resistor. The current mirror circuit supplies a mirror current of the electric current. The control circuit further includes a current source circuit for supplying a driving current to a control terminal of the driving transistor in accordance with the mirror current to turn ON the driving transistor in response... |
| Semiconductor device | 20120086061 | 20120412 |
| A semiconductor device with a transistor for supplying a current to a pixel comprising an EL element, that can supply an accurate current without the influence of variations even when a small signal current, is provided. A precharge voltage is supplied in advance for the current supply to a pixel and subsequently, the signal writing is completed quickly. The precharge voltage is outputted from a circuit for supplying voltage and current that supplies a current to a current source circuit for supplying a current to the pixel. As the precharge voltage, a gate voltage of a transistor for supplying a current to the current source circuit is supplied to the pixel. Optimum precharge voltage can be supplied in the case where W/L of a transistor in... |
| Vol up-shifting level shifters | 20120050930 | 20120301 |
| A representative level-shifter comprises a dynamically biased current source circuit that receives a first voltage, a first and a second unidirectional current-conducting devices, a first and a second pull-down devices, and a pull-up device. The first and second unidirectional current-conducting devices are coupled to the dynamically biased current source circuit. A voltage output of the level-shifter is located at a first node that is located between the current-constant circuit and the second unidirectional current-conducting device. The first and second pull-down devices are coupled to the first and second unidirectional current-conducting devices, respectively. The pull-up device receives a second voltage and is coupled to the dynamically biased current source circuit and the first unidirectional current-conducting device. The pull-up device is configured to dynamically bias the dynamically biased... |
| Constant current source and solid imaging apparatus using the same | 20120038343 | 20120216 |
| A constant current source has a first current source circuit for outputting a first current; a second current source circuit for outputting a second current according to a reference voltage; a current comparison circuit for comparing magnitudes of the first and second currents; and a current adjustment unit for adjusting a current value of the first current output from the first current source circuit in accordance with a comparison result of the current comparison circuit.
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| Control circuit of liquid crystal display device, liquid crystal display device, and electronic device including liquid crystal display device | 20120038618 | 20120216 |
| A current that flows through a common source amplifier circuit provided in a current amplifier circuit of an operational amplifier in displaying a moving image is made to be different from that in displaying a still image. Specifically, in one embodiment of the present invention, current source circuits which are provided in the current amplifier circuit in the operational amplifier operate by switching the current source circuit used for displaying a moving image and the current source circuit used for displaying a still image. The current amplitude in the common source amplifier circuit is controlled by switching the current source circuits, whereby low power consumption in the power supply circuit is achieved. The switching of the current source circuit in the operational amplifier is performed by... |
| Reference current source circuit including added bias voltage generator circuit | 20120025801 | 20120202 |
| A MOS resistor generates an output current based on a voltage induced across a drain and a source thereof. A gate bias voltage generator circuit generates a gate bias voltage so as to operate the MOS resistor in a strong-inversion linear region, and applies the gate bias voltage to a gate of the MOS resistor. A drain bias voltage generator circuit generates a drain bias voltage, and applies the drain bias voltage to the drain of the MOS resistor. An added bias voltage generator circuit generates an added bias voltage, which has a predetermined temperature coefficient and includes a predetermined offset voltage, so that the output current becomes constant against temperature changes. The drain bias voltage generator circuit adds the added bias voltage to the drain... |
| Apparatus and method for magnetic control of an electron beam | 20120027165 | 20120202 |
| An apparatus and method for magnetic control of an electron beam includes a control circuit having a first low voltage source and a second low voltage source. The control circuit also includes a first switching device coupled in series with the first low voltage source and configured to create a first current path with the first low voltage source when in a closed position and a second switching device coupled in series with the second low voltage source and configured to create a second current path with the second low voltage source when in a closed position. The control circuit further includes a capacitor coupled in parallel with an electron beam manipulation coil and positioned along the first and second current paths and a current source... |
