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公开(公告)号：US11258250B2
公开(公告)日：2022-02-22
申请号：US16209898
申请日：2018-12-04
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Balakishan Challa , Lorenzo Crespi
Abstract: Systems and methods are provided for improved stability of driver amplifiers. In one example, a system includes an NMOSFET power device operable to generate a current signal at a drain terminal. The system further includes a current comparison amplifier operable to amplify a difference signal comprising a difference between a replica current signal of the NMOSFET power device and a reference current signal to drive a current comparison amplifier voltage output signal. The system further includes a PMOSFET clamp device comprising a source terminal coupled to a gate terminal of the NMOSFET power device operable to limit a voltage at the gate terminal of the NMOSFET power device responsive to the current comparison amplifier voltage output signal.
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公开(公告)号：US09831884B2
公开(公告)日：2017-11-28
申请号：US15476826
申请日：2017-03-31
Applicant: Synaptics Incorporated
Inventor： Dan Shen , Lorenzo Crespi
Abstract: Noise and distortion reduction in a signal processed through analog circuitry includes providing noise reduction circuitry to reduce signal noise generated by at least one analog circuit element. The noise reduction circuitry is adaptively configured to adjust a rate to apply noise reduction to the signal without introducing unwanted distortion. Distortion reduction circuitry is adaptively configured to adjust a rate to apply distortion reduction to the signal without introducing unwanted noise. The signal is processed through the analog circuitry using the adaptively configured noise reduction circuitry and adaptively configured distortion reduction circuitry to reduce both noise and distortion in the signal.
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公开(公告)号：US11041890B2
公开(公告)日：2021-06-22
申请号：US15789907
申请日：2017-10-20
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Lorenzo Crespi
Abstract: Systems and methods according to one or more embodiments are provided for sensing a current at an output of a switching amplifier. In one example, a system includes a first transistor switch coupled to a load configured to conduct a current in the load responsive to a first pulse width modulated control signal coupled to a gate terminal of the first transistor switch. The system further includes a second transistor switch configured to conduct the current in the load responsive to a second pulse width modulated control signal coupled to a gate terminal of the second transistor switch. A shielding switch is coupled between the load and a current sensing circuit, wherein the shielding switch is configured to provide a small signal voltage to the current sensing circuit in response to the second pulse width modulated control signal, the current sensing circuit is configured to sense the current traveling through the load responsive to the small signal voltage.
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公开(公告)号：US20200176978A1
公开(公告)日：2020-06-04
申请号：US16209898
申请日：2018-12-04
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Balakishan Challa , Lorenzo Crespi
IPC: H02H9/02
Abstract: Systems and methods are provided for improved stability of driver amplifiers. In one example, a system includes an NMOSFET power device operable to generate a current signal at a drain terminal. The system further includes a current comparison amplifier operable to amplify a difference signal comprising a difference between a replica current signal of the NMOSFET power device and a reference current signal to drive a current comparison amplifier voltage output signal. The system further includes a PMOSFET clamp device comprising a source terminal coupled to a gate terminal of the NMOSFET power device operable to limit a voltage at the gate terminal of the NMOSFET power device responsive to the current comparison amplifier voltage output signal.
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公开(公告)号：US10085089B1
公开(公告)日：2018-09-25
申请号：US15817091
申请日：2017-11-17
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Lorenzo Crespi , Davide Cartasegna
CPC classification number: H04R3/007 , G11C27/024 , G11C27/026 , H01L29/7816 , H03F1/523 , H03F3/185 , H03F3/2173 , H03F2200/03 , H03F2200/462 , H03F2200/474
Abstract: Systems and methods according to one or more embodiments are provided for sensing a current at an output of a switching amplifier. In one example, a system includes a first transistor switch coupled to a load configured to conduct a current in the load responsive to a first pulse width modulated control signal and a second transistor switch coupled to the load configured to conduct the current in the load responsive to a second pulse width modulated control signal. The system further includes a sample and hold circuit coupled between the load and a current sensing circuit configured to sample a voltage at the second transistor switch for a pre-determined sample time period in response to a midpoint of a second pulse width modulated control signal time period, and configured to provide the sampled voltage to the current sensing circuit.
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Patent Agency Ranking
公开(公告)号：US20180183320A1
公开(公告)日：2018-06-28
申请号：US15853602
申请日：2017-12-22
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Lorenzo Crespi
Abstract: Methods and systems for implementing a closed loop DC-DC converter utilize a compensator to stabilize the output voltage of the DC-DC converter while improving the loop gain in the band of interest. A compensator may be implemented by an operational amplifier and a feedback circuit. The operational amplifier may be configured to receive a fraction of sensed output voltage at the non-inverting terminal and compare the sensed output voltage with the voltage received at the inverting terminal to generate an error signal which is used to determine the duty cycle of a pulse-width modulated signal.
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公开(公告)号：US11522507B2
公开(公告)日：2022-12-06
申请号：US17213084
申请日：2021-03-25
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Jinbao Lan , Yunfu Zhang , Lorenzo Crespi
Abstract: Various techniques are provided to reduce common mode disturbance associated with an amplifier, such as a class D amplifier. In one example, an amplifier includes a power stage configured to generate first and second PWM signals. The amplifier further includes an integration stage comprising input nodes configured to receive an input differential analog signal. The integration stage is configured to generate an output differential analog signal in response to the PWM signals and the input differential analog signal. The amplifier further includes an active compensation circuit configured to provide a compensation signal to the integration stage to reduce disturbances at the input nodes associated with the PWM signals switching between a common mode and a differential mode. Additional devices, systems, and methods are also provided.
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公开(公告)号：US10833083B2
公开(公告)日：2020-11-10
申请号：US15946688
申请日：2018-04-05
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen
IPC: H01L29/06 , H01L27/092 , H01L29/10 , H01L21/8238 , H03F3/217 , H03F3/185 , H02M3/155
Abstract: Systems and methods according to one or more embodiments are provided for improved reliability and efficiency of high side power stage output drivers used in switching amplifiers. In one example, a system includes a power device structure comprising an nwell structure formed within a semiconductor p substrate and a pwell structure formed within the nwell structure. The system further includes one or more NMOS electronic power devices formed on the pwell structure and a pwell guardring formed on the pwell structure configured to surround the one or more NMOS electronic power devices. The system further includes an nwell guardring formed on the nwell structure configured to surround the pwell structure and a p+ guardring formed on the nwell structure configured to surround the nwell guardring.
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公开(公告)号：US10333473B1
公开(公告)日：2019-06-25
申请号：US15963972
申请日：2018-04-26
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Balakishan Challa , Lorenzo Crespi
Abstract: Systems and methods are provided for improved stability of audio amplifiers that incorporate external speaker connectivity. In one example, a system includes an audio amplifier circuit comprising two or more amplifier stages and a stability resistor and configured to receive an audio input signal, the audio amplifier circuit configured for at least two modes of operation, a first mode having a high input transconductance and the stability resistor is coupled to an output of the audio amplifier circuit, and a second mode having a lower input transconductance and the stability resistor is decoupled from the output of the audio amplifier circuit. The system further includes an amplitude detection circuit configured to provide a signal mode detection signal, an amplifier switching circuit configured to adjust a variable input transconductance of at least one of the amplifier stages, and a load switching circuit configured to couple and decouple the stability resistor at the output of the audio amplifier circuit.
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公开(公告)号：US10211848B1
公开(公告)日：2019-02-19
申请号：US15937764
申请日：2018-03-27
Applicant: SYNAPTICS INCORPORATED
Inventor： Dan Shen , Lorenzo Crespi
IPC: H03M3/00
Abstract: Systems and methods according to one or more embodiments are provided for improving noise performance in a delta sigma modulator comprising an adder, quantizer and nth order filter. The adder is operable to receive an input signal and a feedback signal, and output a modified input signal. The quantizer is operable to receive the modified input signal and output a quantized output signal, the quantized output signal having a corresponding quantization error. The nth order filter is operable to receive a quantization error value and generate the feedback signal, the nth order filter comprising a first memory element having a first error value, a second memory element having a second error value, and a gravity component operable to converge the first error value and the second error value when the input signal is approximately zero.
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