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    Power on reset (POR) circuit with current offset to generate reset signal
    11.
    发明授权
    Power on reset (POR) circuit with current offset to generate reset signal 有权

    公开(公告)号：US10073484B2

    公开(公告)日：2018-09-11

    申请号：US15671657

    申请日：2017-08-08

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

    Inventor： Yong Feng Liu

    IPC: G05F3/26

    CPC classification number: G05F3/267

    Abstract: A Schmitt trigger circuit having an input coupled to a current summing junction. A trickle current source generates a trickle current applied to the current summing junction. A bandgap current source generates a bandgap current applied to the current summing junction (wherein the bandgap current is fixed when a supply voltage exceeds a threshold). A variable current source generates a variable current applied to the current summing junction (wherein the variable current varies dependent on the supply voltage). At the current summing junction, the variable current is offset against the trickle and bandgap currents with respect to generating a voltage that is sensed at the Schmitt trigger circuit input.

    High efficiency class D amplifier with reduced generation of EMI
    13.
    发明授权
    High efficiency class D amplifier with reduced generation of EMI 有权

    公开(公告)号：US09866187B2

    公开(公告)日：2018-01-09

    申请号：US14715879

    申请日：2015-05-19

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

    Inventor： Qi Yu Liu ,  Hong Wu Lin

    IPC: H03F3/38 ,  H03F3/183 ,  H03F3/45 ,  H03F3/217

    CPC classification number: H03F3/183 ,  H03F3/217 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/45475 ,  H03F2200/03 ,  H03F2203/45138

    Abstract: A class-D amplifier includes a signal processing block. The signal processing block generates a first processed signal representing a difference between a first differential signal and a second differential signal, when a duty cycle of the first differential signal is greater than that of the second differential signal. The signal processing block generates the first processed signal representing a reference DC level, when the duty cycle of the first differential signal is less than that of the second differential signal. A second processed signal representing a difference between the second differential signal and the first differential signal is generated when the duty cycle of the second differential signal is greater than that of the first differential signal, and the second processed signal representing the reference DC level is generated when the duty cycle of the second differential signal is less than that of the first differential signal.

    METHOD AND APPARATUS FOR MEASURING AVERAGE INDUCTOR CURRENT DELIVERED TO A LOAD
    16.
    发明申请
    METHOD AND APPARATUS FOR MEASURING AVERAGE INDUCTOR CURRENT DELIVERED TO A LOAD 有权

    公开(公告)号：US20170146571A1

    公开(公告)日：2017-05-25

    申请号：US14955207

    申请日：2015-12-01

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

    Inventor： Meng Wang ,  Xue Lian Zhou

    IPC: G01R15/18

    CPC classification number: G01R15/18 ,  G01R15/16 ,  G01R19/16538

    Abstract: Current flowing through an inductor in response to a pulse width modulation (PWM) control signal is sensed to generate a sensed current. The sensed current is processed over one or more PWM cycles of the PWM control signal to generate an output signal indicative of average inductor current. This processing may include charging and discharging a capacitor at different rates dependent on the sense current, with the detection of capacitor discharge triggering a sampling of a voltage dependent on the sensed current that is indicative of average inductor current. The processing may include using the sensed to current to generate a first charge voltage associated with minimum inductor current and a second charge voltage associated with maximum inductor current, and then averaging the first and second charge voltages to generate an output signal indicative of average inductor current.

    Negative charge pump with soft start
    17.
    发明授权
    Negative charge pump with soft start 有权

    公开(公告)号：US09653990B1

    公开(公告)日：2017-05-16

    申请号：US14955116

    申请日：2015-12-01

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

    Inventor： Meng Wang ,  Xue Lian Zhou

    IPC: H02M3/07

    CPC classification number: H02M3/07 ,  H02M2003/071

    Abstract: A charge pump circuit is coupled between a positive supply node and a ground node. The charge pump circuit operates in response to clock signals output from a clock generator to produce a negative voltage at a negative voltage output node. A soft-start circuit for the charge pump circuit includes a comparison circuit configured to compare a varying intermediate voltage sensed between a rising supply voltage and the negative voltage to a ramp voltage during a start-up period of the charge pump circuit. The clock generator is selectively enabled to generate the clock signals in response to the comparison to provide for pulse-skipping.

    POWER ON RESET (POR) CIRCUIT
    18.
    发明申请
    POWER ON RESET (POR) CIRCUIT 有权

    公开(公告)号：US20170102727A1

    公开(公告)日：2017-04-13

    申请号：US14887739

    申请日：2015-10-20

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

    Inventor： Yong Feng Liu

    IPC: G05F3/26

    CPC classification number: G05F3/267

    Abstract: A Schmitt trigger circuit having an input coupled to a current summing junction. A trickle current source generates a trickle current applied to the current summing junction. A bandgap current source generates a bandgap current applied to the current summing junction (wherein the bandgap current is fixed when a supply voltage exceeds a threshold). A variable current source generates a variable current applied to the current summing junction (wherein the variable current varies dependent on the supply voltage). At the current summing junction, the variable current is offset against the trickle and bandgap currents with respect to generating a voltage that is sensed at the Schmitt trigger circuit input.

    Methods and circuits to reduce pop noise in an audio device
    19.
    发明授权
    Methods and circuits to reduce pop noise in an audio device 有权
    减少音频设备弹奏噪音的方法和电路

    公开(公告)号：US09577579B2

    公开(公告)日：2017-02-21

    申请号：US15057552

    申请日：2016-03-01

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

    Inventor： Ru Feng Du ,  Qi Yu Liu

    IPC: H03F1/02 ,  H03F3/217 ,  H03F3/21 ,  H03F3/185 ,  H03G3/34 ,  H04R3/00 ,  H03F1/30 ,  H03F3/183

    CPC classification number: H03F1/3205 ,  H03F1/0205 ,  H03F1/305 ,  H03F3/183 ,  H03F3/185 ,  H03F3/187 ,  H03F3/211 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/45179 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2203/21106 ,  H03F2203/45151 ,  H03F2203/45156 ,  H03G3/345 ,  H03G3/348 ,  H04R3/002

    Abstract: A class D amplifier receives and amplifies a differential analog signal which is then differentially integrated. Two pulse width modulators generate pulse signals corresponding to the differentially integrated analog signal and two power units generate output pulse signals. The outputs the power units are coupled to input terminals of integrators via a resistor feedback network. An analog output unit converts the pulse signals to an output analog signal. The differential integration circuitry implements a soft transition between mute/un-mute. In mute, the integrator output is fixed. During the soft transition, the PWM outputs change slowly from a fixed 50% duty cycle to a final value to ensure that no pop noise is present in the output as a result of mode change.

    Abstract translation: D类放大器接收并放大差分模拟信号，然后差分模拟信号被差分地积分。 两个脉冲宽度调制器产生对应于差分集成模拟信号的脉冲信号，两个功率单元产生输出脉冲信号。 功率单元的输出通过电阻反馈网络耦合到积分器的输入端。 模拟输出单元将脉冲信号转换为输出模拟信号。 差分积分电路实现静音/非静音之间的软转换。 静音时，积分器输出是固定的。 在软转换期间，PWM输出从固定的50％占空比缓慢变化到最终值，以确保由于模式更改导致输出中没有弹出噪声。

    SWITCHING CONVERTER TO OPERATE IN PULSE WIDTH MODULATION MODE OR PULSE SKIPPING MODE
    20.
    发明申请
    SWITCHING CONVERTER TO OPERATE IN PULSE WIDTH MODULATION MODE OR PULSE SKIPPING MODE 审中-公开
    切换转换器在脉冲宽度调制模式或脉冲跳闸模式下工作

    公开(公告)号：US20160334828A1

    公开(公告)日：2016-11-17

    申请号：US15218605

    申请日：2016-07-25

    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd

    Inventor： Meng Wang ,  Xue Lian Zhou

    IPC: G05F3/26 ,  H02M1/08

    CPC classification number: G05F3/262 ,  H02M1/08 ,  H02M3/158 ,  H02M2001/0032 ,  Y02B70/16

    Abstract: An electronic device disclosed herein 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.

    Abstract translation: 本文公开的电子设备包括电流比较器，用于基于在输出分支中流动的电流与在输入分支中流动的电流之间的差产生输出电流。 一对晶体管耦合到电流比较器的输出端。 第一放大器具有耦合到所述一对晶体管和参考电压的输入，所述第一放大器被配置为从所述一对晶体管上的电压中减去所述参考电压并输出差分电压。 第二放大器具有耦合到差分电压和参考电压的输入，第二放大器被配置为从参考电压中减去差分电压并输出脉冲跳跃模式参考信号。

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