公开(公告)号：US09112467B1

公开(公告)日：2015-08-18

申请号：US13652939

申请日：2012-10-16

Applicant: Cirrus Logic, Inc.

Inventor： John Christopher Tucker ,  Daniel John Allen ,  John L. Melanson ,  Ammisetti Prasad

IPC: H03F99/00 ,  H03G3/20 ,  H02M3/07 ,  H03F1/02

CPC classification number: H03G3/004 ,  H02M3/07 ,  H03F1/0227 ,  H03F1/025 ,  H03F3/183 ,  H03F2200/03 ,  H03F2200/211 ,  H03F2200/507 ,  H03G3/20 ,  H03G3/3031

Abstract: An energy-efficient consumer device audio power output stage with gain control provides improved battery life and reduced power dissipation without clipping the audio output signal. A power supply having a selectable operating mode supplies the power supply rails to the power amplified output stage. The operating mode is controlled in conformity with an input audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The gain applied to the audio input signal is reduced for a predetermined time period when a higher output voltage of the power supply is selected, to avoid clipping the audio output signal.

Abstract translation: 具有增益控制功能的节能消费电子设备音频功率输出级能够提高电池寿命，降低功耗，同时不会影响音频输出信号。 具有可选操作模式的电源将电源轨提供给功率放大输出级。 操作模式根据输入音频信号电平进行控制，输入音频信号电平可以根据设备的音量控制设置和/或从确定被放大的信号的幅度的信号电平检测器确定。 当选择电源的较高输出电压时，施加到音频输入信号的增益在预定时间段内减小，以避免削波音频输出信号。

公开(公告)号：US09705458B1

公开(公告)日：2017-07-11

申请号：US14812405

申请日：2015-07-29

Applicant: Cirrus Logic, Inc.

Inventor： John Christopher Tucker ,  Daniel John Allen ,  John L. Melanson ,  Ammisetti Prasad

IPC: H03G3/00 ,  H03G3/30 ,  H03F3/183

CPC classification number: H03G3/004 ,  H02M3/07 ,  H03F1/0227 ,  H03F1/025 ,  H03F3/183 ,  H03F2200/03 ,  H03F2200/211 ,  H03F2200/507 ,  H03G3/20 ,  H03G3/3031

Abstract: An energy-efficient consumer device audio power output stage with gain control provides improved battery life and reduced power dissipation without clipping the audio output signal. A control circuit controls a power supply that supplies the power supply rails to the power amplified output stage. The voltage of the power supply rails is controlled in conformity with an input audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The gain applied to the audio input signal is reduced for a predetermined time period when a higher output voltage of the power supply is selected, to avoid clipping the audio output signal.