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公开(公告)号：US11190168B2
公开(公告)日：2021-11-30
申请号：US16784392
申请日：2020-02-07
Inventor： Jing Bai , Tejasvi Das , Xin Zhao , Lei Zhu , Xiaofan Fei
IPC: H03K17/687 , H03K3/01 , H03K19/0185 , H03K19/0175 , H04R3/00
Abstract: A driver system may include a first n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a first terminal of a supply voltage and configured to drive the output when the first n-type field-effect transistor is activated, a second n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a second terminal of the supply voltage and configured to drive the output when the second n-type field-effect transistor is activated, a high-side capacitor coupled to the output of the driver system, and a low-side capacitor coupled to the second terminal of the supply voltage, wherein the high-side capacitor and the low-side capacitor are configured to track and correct for mismatches between a first resistance of the first n-type field-effect transistor and a second resistance of the second n-type field-effect transistor.
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公开(公告)号：US11070203B2
公开(公告)日：2021-07-20
申请号：US16162960
申请日：2018-10-17
Inventor： Jing Bai , Tejasvi Das , Xin Zhao , Lei Zhu , Xiaofan Fei
IPC: H03K17/687 , G06F3/01 , H03K17/06 , H03K19/0175 , H03K19/0185 , H03F3/217 , H03F3/183 , H04R3/12
Abstract: A driver system may include a first n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a first terminal of a supply voltage and configured to drive the output when the first n-type field-effect transistor is activated, a second n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a second terminal of the supply voltage and configured to drive the output when the second n-type field-effect transistor is activated, a high-side capacitor coupled to the output of the driver system, and a low-side capacitor coupled to the second terminal of the supply voltage, wherein the high-side capacitor and the low-side capacitor are configured to track and correct for mismatches between a first resistance of the first n-type field-effect transistor and a second resistance of the second n-type field-effect transistor.
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Patent Agency Ranking
公开(公告)号：US10658988B1
公开(公告)日：2020-05-19
申请号：US15943125
申请日：2018-04-02
Inventor： Miao Song , Xiaofan Franky Fei , Xin Zhao , Tejasvi Das , Lei Zhu , Jing Bai , Alan Mark Morton
Abstract: A signal processing system may include a modulation stage configured to generate a modulated input signal, an open-loop switched mode driver coupled to the modulation stage and configured to generate an output signal from the modulated input signal, a voltage regulator configured to generate a supply voltage that supplies electrical energy to the open-loop switched mode driver, and a control subsystem configured to, when a magnitude of the modulated input signal falls below a threshold magnitude, control the voltage regulator to control the supply voltage such that the output signal varies non-linearly with the modulated input signal for magnitudes of the modulated input signal below the threshold magnitude.
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公开(公告)号：US10763811B2
公开(公告)日：2020-09-01
申请号：US16181762
申请日：2018-11-06
Inventor： Lei Zhu , Tejasvi Das , John L. Melanson , Wai-shun Wilson Shum , Jing Bai , Xin Zhao , Xiaofan Fei
Abstract: A system may include a digital modulator configured to modulate an input signal received at an input of the digital modulator to generate a modulated input signal at an output of the digital modulator, a digital gain element having a digital gain and coupled to the digital modulator, an open-loop Class-D amplifier coupled to an output of the digital modulator and configured to amplify the modulated input signal, wherein the open-loop Class-D amplifier is powered from a variable power supply having a variable supply voltage which is variable in response to one or more characteristics of the input signal, and a control circuit configured to control the digital gain to approximately cancel changes in an analog gain of the open-loop Class-D amplifier due to variation in the variable supply voltage in response to the one or more characteristics of the input signal.
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公开(公告)号：US10663531B2
公开(公告)日：2020-05-26
申请号：US16156069
申请日：2018-10-10
Inventor： Lei Zhu , Jing Bai , Xiaofan Fei , Xin Zhao
Abstract: An apparatus detects a short of a class-D amplifier. A pulse detector detects an output PWM pulse exceeds a predetermined width and a controller differentiates whether the pulse width exceeding is caused by a short or by a large digital input signal occurring during normal operation based on an expected level of the digital input signal to a level of the digital input signal when the pulse width exceeds the predetermined width. The expected level is dynamically obtained in response to one or more previous PWM pulses exceeding the predetermined width during the normal operation and may be selected based on an amount the pulse exceeds the predetermined width. A lookup table of predetermined levels, selected based on impedance of a load, provides the expected level if the expected level has not yet been dynamically obtained when the pulse width exceeds.
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公开(公告)号：US11539331B2
公开(公告)日：2022-12-27
申请号：US17348982
申请日：2021-06-16
Inventor： Amar Vellanki , Xin Zhao , Jing Bai , John L. Melanson , Ku He , Wai-Shun Shum , Xiaofan Fei , Alan M. Morton
Abstract: An amplification system with an output driver stage for providing an output signal to acoustic output transducers such as speakers or haptic output devices removes signal distortion caused by output stage non-linearities by pre-distorting an input signal. The system includes the output driver stage, an input stage for receiving the input signal, and a processing block that receives the input signal and provides an output signal to the output driver stage. The processing block includes a pre-distortion circuit that applies a pre-distortion function to the input signal to generate the output signal if a signal level of the input signal is greater than a threshold amplitude, and if the signal level is less than or equal to the threshold amplitude, generates the output signal from the input signal by bypassing the pre-distortion circuit.
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公开(公告)号：US20220329212A1
公开(公告)日：2022-10-13
申请号：US17348982
申请日：2021-06-16
Inventor： Amar Vellanki , Xin Zhao , Jing Bai , John L. Melanson , Ku He , Wai-Shun Shum , Xiaofan Fei , Alan M. Morton
Abstract: An amplification system with an output driver stage for providing an output signal to acoustic output transducers such as speakers or haptic output devices removes signal distortion caused by output stage non-linearities by pre-distorting an input signal. The system includes the output driver stage, an input stage for receiving the input signal, and a processing block that receives the input signal and provides an output signal to the output driver stage. The processing block includes a pre-distortion circuit that applies a pre-distortion function to the input signal to generate the output signal if a signal level of the input signal is greater than a threshold amplitude, and if the signal level is less than or equal to the threshold amplitude, generates the output signal from the input signal by bypassing the pre-distortion circuit.
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