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    CLASS-D AMPLIFIER
    2.
    发明申请
    CLASS-D AMPLIFIER 有权
    CLASS-D放大器

    公开(公告)号：US20160294326A1

    公开(公告)日：2016-10-06

    申请号：US14676411

    申请日：2015-04-01

    Applicant: NXP B.V.

    Inventor： Fré Jorrit Jorritsma ,  Mattheus Johan Koerts ,  Fred Mostert

    IPC: H03F1/02 ,  H03F3/21 ,  H03F3/217 ,  H03F3/185

    CPC classification number: H03F1/0205 ,  H03F3/181 ,  H03F3/185 ,  H03F3/211 ,  H03F3/217 ,  H03F3/2173 ,  H03F3/2175 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/351 ,  H03F2203/21142

    Abstract: One example discloses a class-D amplifier apparatus, comprising: an amplifier circuit, having a set of input terminals, a set of output terminals, a quiescent circuit configuration, and an active circuit configuration; an amplifier control device, coupled to the amplifier circuit; wherein the amplifier control device is configured to place the amplifier circuit in the quiescent circuit configuration before measuring a voltage between the set of output terminals; wherein the amplifier control device is configured to add the output terminals voltage from the set of input terminals before placing the amplifier circuit in the active circuit configuration.

    Abstract translation: 一个例子公开了一种D类放大器装置，包括：放大器电路，具有一组输入端子，一组输出端子，静态电路配置和有源电路配置; 放大器控制装置，耦合到放大器电路; 其中所述放大器控制装置被配置为在测量所述一组输出端子之间的电压之前将所述放大器电路放置在所述静态电路配置中; 其中所述放大器控制装置被配置为在将所述放大器电路置于所述有源电路配置之前，将所述输入端子组的输出端子电压相加。

    Class-D amplifier
    4.
    发明授权
    Class-D amplifier 有权
    D类放大器

    公开(公告)号：US09503023B2

    公开(公告)日：2016-11-22

    申请号：US14676411

    申请日：2015-04-01

    Applicant: NXP B.V.

    Inventor： Fré Jorrit Jorritsma ,  Mattheus Johan Koerts ,  Fred Mostert

    IPC: H03F3/217 ,  H03F1/04 ,  H03F1/02 ,  H03F3/185 ,  H03F3/21

    CPC classification number: H03F1/0205 ,  H03F3/181 ,  H03F3/185 ,  H03F3/211 ,  H03F3/217 ,  H03F3/2173 ,  H03F3/2175 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/351 ,  H03F2203/21142

    Abstract: One example discloses a class-D amplifier apparatus, comprising: an amplifier circuit, having a set of input terminals, a set of output terminals, a quiescent circuit configuration, and an active circuit configuration; an amplifier control device, coupled to the amplifier circuit; wherein the amplifier control device is configured to place the amplifier circuit in the quiescent circuit configuration before measuring a voltage between the set of output terminals; wherein the amplifier control device is configured to add the output terminals voltage from the set of input terminals before placing the amplifier circuit in the active circuit configuration.

    Abstract translation: 一个例子公开了一种D类放大器装置，包括：放大器电路，具有一组输入端子，一组输出端子，静态电路配置和有源电路配置; 放大器控制装置，耦合到放大器电路; 其中所述放大器控制装置被配置为在测量所述一组输出端子之间的电压之前将所述放大器电路放置在所述静态电路配置中; 其中所述放大器控制装置被配置为在将所述放大器电路置于所述有源电路配置之前，将所述输入端子组的输出端子电压相加。

    INTEGRATED CIRCUIT CHARGE PUMP WITH FAILURE PROTECTION
    5.
    发明申请
    INTEGRATED CIRCUIT CHARGE PUMP WITH FAILURE PROTECTION 有权
    具有故障保护的集成电路充电泵

    公开(公告)号：US20160211739A1

    公开(公告)日：2016-07-21

    申请号：US14597538

    申请日：2015-01-15

    Applicant: NXP B.V.

    Inventor： Derk Jan Hissink ,  Jacobus Govert Sneep ,  Fred Mostert ,  Hendrikus van Iersel

    IPC: H02M1/32 ,  H03F3/217 ,  H02M3/07

    CPC classification number: H02M3/073 ,  H02M1/32 ,  H02M1/36 ,  H02M3/07 ,  H03F1/523 ,  H03F3/185 ,  H03F3/2173 ,  H03F2200/03 ,  H03K2217/0081

    Abstract: Disclosed is a charge pump protection device including a power supply voltage, a charge pump to produce an output voltage higher than the power supply voltage, the charge pump including, a pumping capacitor to store voltage during a charging state and to discharge the voltage during a pumping state thereof, a plurality of switches to regulate the charging and pumping states, a charge pump capacitor to store the output voltage, and at least one current limiter in series with at least one of the plurality of switches to limit current and prevent an electrical failure of the charge pump.

    Abstract translation: 公开了一种包括电源电压的电荷泵保护装置，用于产生高于电源电压的输出电压的电荷泵，电荷泵包括：在充电状态期间存储电压的泵浦电容器，以及在充电状态期间放电 泵送状态，用于调节充电和泵送状态的多个开关，用于存储输出电压的电荷泵电容器，以及与多个开关中的至少一个开关串联的至少一个限流器，以限制电流并防止电气 电荷泵故障。

    Gain calibration controller
    6.
    发明授权
    Gain calibration controller 有权

    公开(公告)号：US09941853B2

    公开(公告)日：2018-04-10

    申请号：US15651146

    申请日：2017-07-17

    Applicant: NXP B.V.

    Inventor： Fred Mostert

    IPC: H03G3/02 ,  H03F3/21 ,  H03F3/217

    CPC classification number: H03G3/02 ,  H03F1/305 ,  H03F3/2173 ,  H03F3/2175 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/321 ,  H03F2200/351 ,  H03G3/04 ,  H03G3/3005 ,  H03G3/3089

    Abstract: A gain calibration controller and gain calibration method is described for calibrating the gain of a class D audio amplifier comprising an adjustable gain stage and a feedback path coupled to an output of a reconstruction filter. The gain calibration controller detects a first output noise level in a first frequency range and a second output noise level in a second higher frequency range, varies the gain of the adjustable gain stage, determines a minimum stable gain value of a stable gain range from a change in at least one of the first and second output noise level in response to varying the gain of the adjustable gain stage, and determines a maximum stable gain value of the stable gain range from a change in at least one of the first and second output noise level in response to varying the gain of the adjustable gain stage.

    LOAD DETECTOR
    7.
    发明申请
    LOAD DETECTOR 审中-公开

    公开(公告)号：US20170350923A1

    公开(公告)日：2017-12-07

    申请号：US15612550

    申请日：2017-06-02

    Applicant: NXP B.V.

    Inventor： Fred Mostert ,  Gertjan van Holland ,  Paul Wielage

    IPC: G01R17/02 ,  H03F3/181

    CPC classification number: G01R17/02 ,  G01R27/16 ,  G01R31/006 ,  G01R31/2825 ,  H03F3/181 ,  H03F3/217 ,  H03F2200/03 ,  H03F2200/165 ,  H03F2200/471 ,  H03M1/12 ,  H03M1/66 ,  H04R3/00 ,  H04R2420/05

    Abstract: A method and apparatus of load detection for an audio amplifier system is described. A load detector includes a first load terminal and a second load terminal; a controller coupled to the first and second load terminals and configured to in a first control loop, vary a first current supplied to a first load terminal dependent on the difference between a first reference signal and the detected first load terminal voltage; and in a second control loop, vary a second current supplied to the second load terminal dependent on the difference between a second reference signal and the detected second load terminal voltage; and to determine a current through a load connected between the first load terminal and the second load terminal from the second current value, and a voltage across the load from the detected voltage difference between the first load terminal voltage and the second load terminal voltage.

    Load detector
    9.
    发明授权
    Load detector 有权

    公开(公告)号：US10698007B2

    公开(公告)日：2020-06-30

    申请号：US15612550

    申请日：2017-06-02

    Applicant: NXP B.V.

    Inventor： Fred Mostert ,  Gertjan van Holland ,  Paul Wielage

    IPC: G01R17/02 ,  H03F3/217 ,  H04R3/00 ,  G01R31/28 ,  H03F3/181 ,  H03M1/12 ,  G01R27/16 ,  H03M1/66 ,  G01R31/00

    Abstract: A method and apparatus of load detection for an audio amplifier system is described. A load detector includes a first load terminal and a second load terminal; a controller coupled to the first and second load terminals and configured to in a first control loop, vary a first current supplied to a first load terminal dependent on the difference between a first reference signal and the detected first load terminal voltage; and in a second control loop, vary a second current supplied to the second load terminal dependent on the difference between a second reference signal and the detected second load terminal voltage; and to determine a current through a load connected between the first load terminal and the second load terminal from the second current value, and a voltage across the load from the detected voltage difference between the first load terminal voltage and the second load terminal voltage.

    Automatic loop gain calibration in amplification circuits
    10.
    发明授权
    Automatic loop gain calibration in amplification circuits 有权

    公开(公告)号：US10243533B1

    公开(公告)日：2019-03-26

    申请号：US15891790

    申请日：2018-02-08

    Applicant: NXP B.V.

    Inventor： Marco Berkhout ,  Fred Mostert ,  Massimo Ciacci ,  Mattheus Johan Koerts ,  Martin Kessel

    IPC: H03G3/30 ,  H03F3/183 ,  H03F3/217 ,  H03G3/02 ,  H04R3/00

    Abstract: Aspects are directed to an amplifier circuit including a signal processing circuit and a calibration circuit. In certain specific embodiments, the signal processing circuit includes a signal combiner and a closed-loop feedback path, and the signal processing circuit is designed to provide a loop transfer function for a derived signal partly representing contributions from an audio input signal, a control or pilot signal having a target frequency range, and a calibration signal. The signal combiner is designed to combine aspects of the control or pilot signal and aspects of the audio input signal, and the calibration circuit is designed to adjust an effective gain of the derived signal in response to whether a unity-gain frequency of a signal in the closed-loop feedback path, as provided via the loop transfer function, is higher or lower than the target frequency range. Consistent therewith and in yet more specific embodiments, such an amplifier circuit can define the target frequency range relative to the transfer function and an associated unity-gain frequency.

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