公开(公告)号：US09209762B1

公开(公告)日：2015-12-08

申请号：US14061912

申请日：2013-10-24

Applicant: Cirrus Logic, Inc.

Inventor： Yousof Mortazavi ,  Arash Mashayekhi ,  Mohammad Ranjbar

IPC: H03F3/217 ,  H03F3/185

CPC classification number: H03F3/217 ,  H03F1/305 ,  H03F3/185 ,  H03F3/2171 ,  H03F3/2175

Abstract: In a switched-power amplifier that has controlled power supply rails, e.g., when a volume control is implemented by varying the power supply voltages, a rate-controlled power supply control circuit eliminates audible pops that would otherwise occur when a change in input level causes the power supply rail voltages to change. The control circuit generates control signals that control the regulators providing the power supply rails with a controlled rate of change such that asymmetry between the voltages of the power supply rail outputs during changes of the power supply rails is substantially reduced. The controlled rate of change is less than or equal to the slowest rate of change of the power supply outputs that supply the power supply rails of the switched-power amplifier.

Abstract translation: 在具有受控电源轨的开关功率放大器中，例如，当通过改变电源电压来实现音量控制时，速率控制的电源控制电路消除了当输入电平变化导致的可能出现的声音 电源轨电压发生变化。 所述控制电路产生控制信号，所述控制信号控制所述调节器为所述电源轨提供控制的变化率，使得在所述电源轨的变化期间所述电源轨输出的电压之间的不对称性大大降低。 控制变化率小于或等于提供开关功率放大器的电源轨的电源输出的最慢变化率。

公开(公告)号：US09722620B1

公开(公告)日：2017-08-01

申请号：US15338818

申请日：2016-10-31

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi ,  Yousof Mortazavi ,  John L. Melanson ,  Aaron Brennan

IPC: H03M1/06 ,  G10L19/00

CPC classification number: H03M1/0602 ,  G10L19/00 ,  H03M1/1004 ,  H03M1/1038 ,  H03M1/1042 ,  H03M1/188 ,  H03M1/60

Abstract: The overall performance of a dual-path ADC system may be improved by using a VCO-based ADC for small-amplitude signals and employing non-linear cancelation to remove nonlinearities in signals output by the VCO-based ADC. In particular, VCO-based dual-path ADC systems of this disclosure may be configured to receive a first digital signal from a first ADC and a second digital signal from a second ADC, wherein the second digital signal is more non-linear than the first digital signal. The dual-path systems may also be configured to determine one or more non-linear coefficients of the second digital signal based, at least in part, on processing of the first and second digital signals. The dual-path systems may be further configured to modify the second digital signal based, at least in part, on the determined one or more non-linear coefficients to generate a more linear second digital signal.