CLASS-D AMPLIFIER
    1.
    发明公开
    CLASS-D AMPLIFIER 有权
    KLASSE-D-VERSTÄRKER

    公开(公告)号:EP3076546A1

    公开(公告)日:2016-10-05

    申请号:EP16162898.7

    申请日:2016-03-30

    申请人: NXP B.V.

    IPC分类号: H03F3/181 H03F3/217

    摘要: 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.

    摘要翻译: 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,从所述输入端子组中添加所述输出端子电压。

    GAIN CALIBRATION CONTROLLER
    2.
    发明公开
    GAIN CALIBRATION CONTROLLER 审中-公开
    增益校准控制器

    公开(公告)号:EP3276825A1

    公开(公告)日:2018-01-31

    申请号:EP16181477.7

    申请日:2016-07-27

    申请人: NXP B.V.

    发明人: MOSTERT, Fred

    IPC分类号: H03F3/217 H03G3/30 H03F1/30

    摘要: A gain calibration controller (230) and gain calibration method is described for calibrating the gain of a class D audio amplifier (240) comprising an adjustable gain stage (208) and a feedback path coupled to an output of a reconstruction filter (216). 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.

    摘要翻译: 描述了用于校准包括可调增益级(208)和耦合到重建滤波器(216)的输出的反馈路径的D类音频放大器(240)的增益的增益校准控制器(230)和增益校准方法。 增益校准控制器检测第一频率范围内的第一输出噪声电平和第二更高频率范围内的第二输出噪声电平,改变可调节增益级的增益,确定稳定增益范围的最小稳定增益值, 响应于改变可调增益级的增益而改变第一和第二输出噪声电平中的至少一个,并且根据第一和第二输出中的至少一个的改变来确定稳定增益范围的最大稳定增益值 响应于改变可调节增益级的增益的噪声级。

    LOAD DETECTOR
    4.
    发明公开
    LOAD DETECTOR 审中-公开
    负载检测器

    公开(公告)号:EP3252483A1

    公开(公告)日:2017-12-06

    申请号:EP16172582.5

    申请日:2016-06-02

    申请人: NXP B.V.

    摘要: A method and apparatus of load detection for an audio amplifier system is described. A load detector (300) includes a first load terminal (Vp) and a second load terminal (Vn); a controller (302) coupled to the first (Vp) and second (Vn) load terminals and configured to in a first control loop (344, 308, 338), vary a first current (332) supplied to a first load terminal (Vp) dependent on the difference between a first reference signal and the detected first load terminal voltage (312); and in a second control loop (346,306,340), vary a second current (336) supplied to the second load terminal (Vn) dependent on the difference between a second reference signal and the detected second load terminal voltage (324); and to determine a current through a load connected between the first load terminal (Vp) and the second load terminal (Vn) from the second current value (336), and a voltage across the load (344) from the detected voltage difference between the first load terminal voltage (Vp) and the second load terminal voltage (Vn).

    摘要翻译: 描述了用于音频放大器系统的负载检测的方法和设备。 负载检测器(300)包括第一负载端子(Vp)和第二负载端子(Vn); 耦合到第一负载端子(Vp)和第二负载端子(Vn)并且被配置为在第一控制环路(344,308,338)中的控制器(302)改变提供给第一负载端子(Vp)的第一电流(332) )取决于第一参考信号与所检测的第一负载端子电压(312)之间的差值; 并且在第二控制回路(346,306,340)中,根据第二参考信号和所检测的第二负载端子电压(324)之间的差异来改变供应到第二负载端子(Vn)的第二电流(336); 并且根据所检测到的所述第一负载端子(Vp)和所述第二负载端子(Vn)之间的电压差来确定从所述第二电流值(336)通过连接在所述第一负载端子(Vp)和所述第二负载端子 第一负载端电压(Vp)和第二负载端电压(Vn)。