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公开(公告)号：US10944366B2
公开(公告)日：2021-03-09
申请号：US16291971
申请日：2019-03-04
Applicant: STMicroelectronics (Shenzhen) R&D Co., Ltd.
Inventor： Ru Feng Du , XiangSheng Li
Abstract: In an embodiment, a class-AB amplifier includes: an output stage that includes a pair of half-bridges configured to be coupled to a load; and a current sensing circuit coupled to a first half-bridge of the pair of half-bridges. The current sensing circuit includes a resistive element and is configured to sense a load current flowing through the load by: mirroring a current flowing through a first transistor of the first half-bridge to generate a mirrored current, flowing the mirrored current through the resistive element, and sensing the load current based on a voltage of the resistive element.
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公开(公告)号：US10917086B2
公开(公告)日：2021-02-09
申请号：US16410857
申请日：2019-05-13
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： Jian Wen , Hong Xia Li , Mei Yang
IPC: H03K17/687 , H03F3/45 , G01R31/30
Abstract: In an embodiment, a power switch controller for driving a back-to-back power switch includes: an amplifier having a supply terminal configured to receive a supply voltage, an output configured to be coupled to a gate terminal of the back-to-back power switch, a first input configured to be coupled a source terminal of the back-to-back power switch, and a second input coupled to the output of the amplifier. The amplifier is configured to generate an output voltage at the output of the amplifier, the output voltage being an offset voltage higher than a voltage at the first input of the amplifier.
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公开(公告)号：US10911092B2
公开(公告)日：2021-02-02
申请号：US16677422
申请日：2019-11-07
Inventor： Songfeng Zhao , Jean Pierre Proot
Abstract: A digital-to-analog converter (DAC) and a method for operating the DAC are disclosed. The DAC receives, over a first channel, a control signal that is transmitted in accordance with a binary protocol. The DAC also receives, over a second channel different than the first channel, data that is transmitted in accordance with a multilevel communication protocol that is different than the binary protocol. The DAC determines a plurality of first and second voltages based on the received data and identifies, based on the control signal, a time when data transmission or reception is switched between first and second antennas. In response to identifying, based on the control signal, the time when data transmission or reception is switched, the DAC outputs the determined plurality of first voltages to a first antenna tuning circuit or the determined plurality of second voltages to a second antenna tuning circuit.
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公开(公告)号：US10325584B2
公开(公告)日：2019-06-18
申请号：US14863228
申请日：2015-09-23
Inventor： Luca Molinari , Xi Chun Ma , Sandro Dalle Feste , Martino Zerbini
IPC: H04R1/10 , G10K11/178
Abstract: An active noise cancelling device including a sensor configured to convert acoustic signals into first audio signals and a speaker acoustically coupled to the sensor A control stage is configured to control the speaker based on the first audio signals to cause the speaker to produce cancelling acoustic waves that tend to suppress acoustic noise components in the acoustic signals. The control stage includes sigma-delta modulator digital filters.
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公开(公告)号：US20190141811A1
公开(公告)日：2019-05-09
申请号：US16238103
申请日：2019-01-02
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Tao Tao HUANG , Yi Jun DUAN
Abstract: A driving apparatus configured to drive a light emitting device includes a driving current source module operable to supply current to the light emitting device via a node during operation. A protection module coupled to the node and the driving current source module selectively injects current to the node during operation. The driving current source module is controlled based on a detection result of a voltage on the node.
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Patent Agency Ranking
公开(公告)号：US10101762B2
公开(公告)日：2018-10-16
申请号：US15702917
申请日：2017-09-13
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Meng Wang , Xue Lian Zhou
Abstract: An electronic device includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.
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公开(公告)号：US10050595B2
公开(公告)日：2018-08-14
申请号：US15723622
申请日：2017-10-03
Inventor： XiangSheng Li , Cristiano Meroni , Mei Yang , Xian Feng Xiong
Abstract: A circuit can be used in a speaker system. The circuit includes an amplifier with an output configured to be coupled to a speaker. An offset comparator has an input coupled the output of the amplifier and is configured to provide an offset control signal. A digital circuit has a first input coupled to an output of the offset comparator, a second input configured to receive an amplifier control signal, a third input configured to receive a play control signal, and an output configured to provide a forced mute signal that can be used to control the amplifier.
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168.发明申请公开(公告)号：US20180004241A1
公开(公告)日：2018-01-04
申请号：US15702917
申请日：2017-09-13
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Meng Wang , Xue Lian Zhou
CPC classification number: G05F3/262 , H02M1/08 , H02M3/158 , H02M2001/0032 , Y02B70/16
Abstract: An electronic device includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.
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公开(公告)号：US09800221B2
公开(公告)日：2017-10-24
申请号：US15356269
申请日：2016-11-18
Inventor： XiangSheng Li , Cristiano Meroni , Mei Yang , Xian Feng Xiong
CPC classification number: H03G3/348 , H03F1/52 , H03F3/183 , H03F3/21 , H03F2200/321 , H03F2200/375 , H03F2200/471 , H03F2200/78 , H03G11/00 , H04R1/00 , H04R3/007 , H04R2201/028 , H04R2499/13
Abstract: A circuit can be used in a speaker system. The circuit includes an amplifier with an output configured to be coupled to a speaker. An offset comparator has an input coupled the output of the amplifier and is configured to provide an offset control signal. A digital circuit has a first input coupled to an output of the offset comparator, a second input configured to receive an amplifier control signal, a third input configured to receive a play control signal, and an output configured to provide a forced mute signal that can be used to control the amplifier.
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公开(公告)号：US20170299638A1
公开(公告)日：2017-10-19
申请号：US15641088
申请日：2017-07-03
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Yijun Duan
IPC: G01R19/12 , G01R19/165 , H05B33/08
CPC classification number: G01R19/12 , G01R19/16557 , H05B33/0845 , H05B33/0887
Abstract: A bidirectional voltage differentiator circuit comprises start-up circuitry, sensing circuitry, and output circuitry coupled to logic circuitry. The start-up circuitry acts to start-up the sensing circuitry when the circuit is powered on, and accelerates the response of the sensing circuitry thereafter. The sensing circuitry senses variation in an input voltage applied to an input node. Responsive to the voltage variation sensed by the sensing circuitry, the output circuitry produces a state change at a first or second output node. The logic circuitry receives the states of the output nodes and produces a logic output signal to indicate the occurrence of the variation sensed in the input voltage. The voltage sensing circuit is operable to sense variation of the input voltage regardless of whether the voltage is rising or falling and without regard to the DC value of the input voltage.
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