公开(公告)号：US09301046B1

公开(公告)日：2016-03-29

申请号：US14039662

申请日：2013-09-27

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  Xiaofan Fei ,  Miao Song

IPC: H04R3/00

CPC classification number: H04R3/04 ,  H04R1/1041

Abstract: A control circuit coupled to a differential audio output stage may, responsive to a transition in a power supply voltage generated by a power supply, modify at least one of: (i) a first bandwidth associated with the power supply; (ii) a second bandwidth associated with a common-mode voltage generator for generating a desired output common-mode voltage based on the power supply voltage; and (iii) a third bandwidth associated with a common-mode feedback loop of the audio-output stage for setting an actual common-mode voltage at each of the pair of differential output terminals based on the desired output common-mode voltage; such that the second bandwidth is greater than or substantially equal to the first bandwidth during the transition and the third bandwidth is greater than or substantially equal to the second bandwidth during the transition.

Abstract translation: 耦合到差分音频输出级的控制电路可以响应于由电源产生的电源电压的转变来修改以下至少一个：（i）与电源相关联的第一带宽; （ii）与共模电压发生器相关联的第二带宽，用于基于所述电源电压产生期望的输出共模电压; 以及（iii）与所述音频输出级的共模反馈回路相关联的第三带宽，用于基于所述期望的输出共模电压来设置所述一对差分输出端中的每一对的实际共模电压; 使得第二带宽大于或基本上等于转换期间的第一带宽，并且第三带宽在转换期间大于或基本等于第二带宽。