| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 161 | COMPENSATION PARAMETER AND PREDISTORTION SIGNAL | US15650541 | 2017-07-14 | US20170317699A1 | 2017-11-02 | Junming Li |
| A controller can include a signal generator configured to provide an input signal to a modulator. The controller can be configured to generate a modulator compensation parameter in response to a modulated feedback signal corresponding to an output of the modulator. The controller can also be configured to generate a power amplifier predistortion signal in response to an amplified feedback signal corresponding to an output of a power amplifier coupled to the modulator. | ||||||
| 162 | High performance digital to analog converter | US15448813 | 2017-03-03 | US09728261B2 | 2017-08-08 | Antonino Conte; Maria Giaquinta |
| A digital-to-analog converter (DAC) may include a conversion block providing a first analog value. The DAC may also include an amplification block for receiving the first analog value and providing a second analog value amplified by an amplification factor. The amplification block may include a first input terminal for receiving the first analog value, a second input terminal, and an output terminal for providing the second analog value. The amplification block may also include a first capacitive element and a second capacitive element. The first and second capacitive elements may determine the amplification factor. The amplification block may further include a control unit for recovering a charge at a first terminal of the second capacitive element, and based thereon, the second analog value. | ||||||
| 163 | HEADPHONE DRIVER, A SOUND SYSTEM THAT INCORPORATES THE HEADPHONE DRIVER AND A COMPUTING SYSTEM THAT INCORPORATES THE HEADPHONE DRIVER | US15332275 | 2016-10-24 | US20170201827A1 | 2017-07-13 | SANG HYUB KANG; SUN WOO KWON; HYUN SUN SHIM; MYUNG JIN LEE |
| A headphone driver, a sound processor that incorporates the headphone driver and a computing system that incorporates the headphone driver are provided. The headphone driver includes an amplifier having an input terminal and an output terminal, an R-2R ladder network provided with an input signal and connected to the input terminal of the amplifier, and a feedback resistor group connected to the input terminal and to the output terminal of the amplifier. The R-2R ladder network includes a plurality of resistor branches and a first attenuator that is connected between the plurality of resistor branches. | ||||||
| 164 | HIGH PERFORMANCE DIGITAL TO ANALOG CONVERTER | US15448813 | 2017-03-03 | US20170178731A1 | 2017-06-22 | Antonino Conte; Maria Giaquinta |
| A digital-to-analog converter (DAC) may include a conversion block providing a first analog value. The DAC may also include an amplification block for receiving the first analog value and providing a second analog value amplified by an amplification factor. The amplification block may include a first input terminal for receiving the first analog value, a second input terminal, and an output terminal for providing the second analog value. The amplification block may also include a first capacitive element and a second capacitive element. The first and second capacitive elements may determine the amplification factor. The amplification block may further include a control unit for recovering a charge at a first terminal of the second capacitive element, and based thereon, the second analog value. | ||||||
| 165 | High linearity structure for amplifier | US14812867 | 2015-07-29 | US09641128B2 | 2017-05-02 | Chien-Chung Yang; Vijayakumar Dhanasekaran |
| An apparatus includes an input amplifier stage and a switch that has a first terminal at a virtual ground input of the input amplifier stage. | ||||||
| 166 | METHODS AND APPARATUS FOR REDUCING TRANSIENT GLITCHES IN AUDIO AMPLIFIERS | US15186273 | 2016-06-17 | US20170063309A1 | 2017-03-02 | Kshitij YADAV; Vijayakumar DHANASEKARAN |
| An audio amplifier, including: at least a two stage amplifier configured to receive an input signal and output an amplified output signal, the at least a two stage amplifier including at least one stage amplifier and an output stage amplifier; and an auxiliary stage amplifier having an input coupled to an output of the at least one stage amplifier and an input of the output stage amplifier. | ||||||
| 167 | DIFFERENTIAL VOLTAGE REFERENCE BUFFER WITH RESISTOR CHOPPING | US14830584 | 2015-08-19 | US20170054415A1 | 2017-02-23 | Dongyang Tang; Vijayakumar Dhanasekaran |
| A voltage reference buffer circuit, including: an amplifier having input terminals and output terminals; a plurality of current sources coupled to the input terminals of the amplifier, the plurality of current sources including a plurality of degeneration resistors coupled to a first plurality of voltage supplies; and a degeneration resistor chopping module comprising a first and second plurality of switches coupled to the plurality of degeneration resistors. | ||||||
| 168 | HIGH LINEARITY STRUCTURE FOR AMPLIFIER | US14812867 | 2015-07-29 | US20170033744A1 | 2017-02-02 | Chien-Chung Yang; Vijayakumar Dhanasekaran |
| An apparatus includes an input amplifier stage and a switch that has a first terminal at a virtual ground input of the input amplifier stage. | ||||||
| 169 | BAND OPTIMISED RF SWITCH LOW NOISE AMPLIFIER | US15094534 | 2016-04-08 | US20160301369A1 | 2016-10-13 | EUGENE HEANEY; JOHN O'SULLIVAN |
| An RF switching circuit is described. The RF switching circuit comprises an RF switch having multiple RF inputs and two or more switch outputs; a low noise amplifier (LNA) having two or more amplification branches, each amplification branch being associated with a corresponding switch output; and a bypass switching mechanism configured for selectively bypassing the amplification branches. | ||||||
| 170 | Zero Drift, Limitless and Adjustable Reference Voltage Generation | US15094459 | 2016-04-08 | US20160299519A1 | 2016-10-13 | Dan Vinge Madsen; Stig Alnøe Lindemann |
| A circuit for generation of a reference voltage for an electronic system, which circuit comprises at least one digital buffer (U21, U31, U32, U41, U51), a low pass filter (R21, C21; R31, C31; R41, C41; R51, C51) and an operational amplifier (OA21, OA31, OA41, OA51)), which circuit is adapted to revive an input in the form of a bandgap reference voltage into the digital buffer, which digital buffer is adapted to receive a digital input from a Pulse Width Modulated (PWM) signal, which digital buffer is adapted to generate an output signal adapted to be fed to the low pass filter, which output signal after filtration is adapted to be fed to a positive input terminal of the operational amplifier, which operational amplifier comprises a feedback circuit, which feedback circuit comprises at least one capacitor (C22, C32, C44, C54) adapted to be connected from an output terminal of the operational amplifier towards a negative input terminal of the operational amplifier so as to form an integrator, wherein the feedback circuit further comprises at least one chopped signal path (R22, S21; R33, R34, S32; R33, R35, C35, S31), which chopped signal is adapted to be modulated by the output signal of the digital buffer. | ||||||
| 171 | COMPENSATION PARAMETER AND PREDISTORTION SIGNAL | US14625742 | 2014-10-17 | US20160248454A1 | 2016-08-25 | Junming LI |
| A controller can include a signal generator configured to provide an input signal to a modulator. The controller can be configured to generate a modulator compensation parameter in response to a modulated feedback signal corresponding to an output of the modulator. The controller can also be configured to generate a power amplifier predistortion signal in response to an amplified feedback signal corresponding to an output of a power amplifier coupled to the modulator. | ||||||
| 172 | Buffer amplifier circuit | US14723044 | 2015-05-27 | US09356565B2 | 2016-05-31 | Hae-Seung Lee |
| 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. In another example, a discrete-time amplifier is implemented. During the sampling phase at least one input voltage is sampled, and during the transfer phase at least one capacitor is coupled across the input and the output terminals of a buffer amplifier to effectuate an amplification. | ||||||
| 173 | Broadband single-ended input to differential output low-noise amplifier | US14107478 | 2013-12-16 | US09263998B2 | 2016-02-16 | Hung-Chuan Pai |
| A low-noise amplifier accepts a single-ended input signal at an input port and provides a differential output signal at an output port. Each of a pair of transistors in the amplifier has a pair of input terminals and a pair of output terminals that share a common terminal. A feedback circuit is electrically connected between the non-common output terminal and the non-common input terminal of a closed-loop one of the transistors and is electrically disconnected from any two terminals of an open-loop one of the transistors. The input port has a signal-carrying input terminal electrically connected to the non-common input terminal of both of the transistors and a ground terminal. The output port has a positive terminal electrically connected to the common terminal of the open-loop transistor and a negative terminal electrically connected to non-common output terminal of the closed-loop transistor. | ||||||
| 174 | REFERENCE AMPLIFIER COUPLED TO A VOLTAGE DIVIDER CIRCUIT TO PROVIDE FEEDBACK FOR AN AMPLIFIER | US14334442 | 2014-07-17 | US20160020736A1 | 2016-01-21 | Vijayakumar Dhanasekaran |
| An apparatus includes a voltage divider circuit and a reference amplifier coupled to the voltage divider circuit. The reference amplifier is configured to provide a feedback voltage to input circuitry of an amplifier. | ||||||
| 175 | Amplifier for a wireless receiver | US13983641 | 2012-02-07 | US09077302B2 | 2015-07-07 | Grégory Wagner; Rayan Mina |
| Amplifier (6) for a wireless receiver, the amplifier comprising a voltage amplifier module having a voltage gain switchable between a first voltage gain value and a second voltage gain value higher than the first gain value, and a resistance module having a resistance switchable between a first resistance value and a second resistance value higher than the first resistance value, an output of the voltage amplifier module being connected to an input of the resistance module, the amplifier further comprising a set of switches configured to set the voltage gain value and the resistance value, the amplifier being operable in:—a nominal mode of operation in which the voltage gain value is set to the second voltage gain value, the resistance value being set to the second resistance value, and—a high linearity mode of operation in which the voltage gain value is set to the first voltage gain value to improve linearity of the amplifier, the resistance value being set to the first resistance value to have the same ratio of the voltage gain value to the resistance value as in the nominal mode of operation. | ||||||
| 176 | Low-noise low-distortion signal acquisition circuit and method with reduced area utilization | US14260885 | 2014-04-24 | US09076554B1 | 2015-07-07 | Alfio Zanchi; Shinichi Hisano |
| A sample and hold amplifier includes an input node for receiving an input current signal, a non-linear sampling capacitor circuit having an input coupled to the input node, an operational amplifier having a negative input coupled to an output of the non-linear sampling capacitor circuit, a positive input coupled to ground, and an output for providing a sample and hold voltage signal, and a linear capacitor coupled between the negative input and the output of the operational amplifier. The non-linear sampling capacitor includes a non-linear capacitor coupled between an intermediate node and ground, a first switch coupled between the input and the intermediate node configured to switch according to a first phase signal, and a second switch coupled between the output and the intermediate node configured to switch according to a second phase signal. | ||||||
| 177 | BROADBAND SINGLE-ENDED INPUT TO DIFFERENTIAL OUTPUT LOW-NOISE AMPLIFIER | US14107478 | 2013-12-16 | US20150171803A1 | 2015-06-18 | Hung-Chuan Pai |
| A low-noise amplifier accepts a single-ended input signal at an input port and provides a differential output signal at an output port. Each of a pair of transistors in the amplifier has a pair of input terminals and a pair of output terminals that share a common terminal. A feedback circuit is electrically connected between the non-common output terminal and the non-common input terminal of a closed-loop one of the transistors and is electrically disconnected from any two terminals of an open-loop one of the transistors. The input port has a signal-carrying input terminal electrically connected to the non-common input terminal of both of the transistors and a ground terminal. The output port has a positive terminal electrically connected to the common terminal of the open-loop transistor and a negative terminal electrically connected to non-common output terminal of the closed-loop transistor. | ||||||
| 178 | Integrated amplifier for driving acoustic transducers | US13808604 | 2011-08-02 | US09054646B2 | 2015-06-09 | Germano Nicollini; Federico Guanziroli; Massimo Orio; Carlo Pinna |
| The invention relates to an electronic integrated amplifier for driving an acoustic transducer. The amplifier comprises two differential input terminals to receive an input signal and a first and a second output terminal to provide an output signal to the transducer. In addition, the amplifier comprises an operational amplifier having an input end including differential inputs and an output end operatively associated with the first and second output terminals. A pair of input resistors connect the two differential input terminals to two intermediate terminals, respectively. A pair of feedback resistors connect the first and second output terminals to the two intermediate terminals, respectively. The integrated amplifier also comprises means for high-pass filtering the input signal. Such filtering means is characterized in that it comprises an input element interposed between said intermediate terminals and the input end of the operational amplifier, and a feedback element connected between the input end and the output end of the same operational amplifier. | ||||||
| 179 | TRANSCONDUCTANCE CIRCUIT AND A CURRENT DIGITAL TO ANALOG CONVERTER USING SUCH TRANSCONDUCTANCE CIRCUITS | US14185701 | 2014-02-20 | US20140340150A1 | 2014-11-20 | Dennis A. Dempsey; Sean Brennan; Colin Lyden; John Jude O'Donnell |
| An example transconductance circuit is provided in accordance with one embodiment. The transconductance circuit can comprise: an output node; at least one transistor; a variable resistance; and a differential amplifier; wherein the at least one transistor and the variable resistance are in series connection with the output node, an output of the differential amplifier is connected to a control node of the at least one transistor, a first input of the amplifier is responsive to an input signal, and a second input of the amplifier is responsive to a voltage across the variable resistance. Such a circuit may overcome noise problems in transconductance circuits which operate over a wide range of input signals with a fixed resistor in series with the at least one transistor. | ||||||
| 180 | AMPLIFIERS WITH BOOSTED OR DEBOOSTED SOURCE DEGENERATION INDUCTANCE | US13857031 | 2013-04-04 | US20140300417A1 | 2014-10-09 | Rui Xu; Li-Chung Chang |
| Amplifiers with boosted or deboosted source degeneration inductance are disclosed. In an exemplary design, an apparatus includes an amplifier circuit and a feedback circuit. The amplifier circuit receives an input signal and provides an output signal and includes a source degeneration inductor. The feedback circuit is coupled between a node of the amplifier circuit and the source degeneration inductor. The feedback circuit provides feedback to vary an input impedance of an amplifier including the amplifier circuit and the feedback circuit. The feedback circuit may be programmable and may be enabled to provide feedback or disabled to provide no feedback. Alternatively, the feedback circuit may always be enabled to provide feedback. In either case, the feedback circuit may have a variable gain to provide a variable input impedance for the amplifier. | ||||||
QQ群二维码
意见反馈
意见反馈