Invention Grant
- Patent Title: Amplifier with adjustable ramp up/down gain for minimizing or eliminating pop noise
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Application No.: US14920698Application Date: 2015-10-22
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Publication No.: US09673762B2Publication Date: 2017-06-06
- Inventor: Lingli Zhang , Huan Wang , Yongjie Cheng , Christian Larsen
- Applicant: Cirrus Logic, Inc.
- Applicant Address: US TX Austin
- Assignee: CIRRUS LOGIC, INC.
- Current Assignee: CIRRUS LOGIC, INC.
- Current Assignee Address: US TX Austin
- Agency: Norton Rose Fulbright US LLP
- Main IPC: H03F3/38
- IPC: H03F3/38 ; H03F3/185 ; H03F1/02 ; H03F3/217 ; H03F1/30

Abstract:
A variable ramp up/down gain in a pre-power stage block of an audio amplifier may be used to reduce audible pops and clicks output by the audio amplifier. A controller may adjust the variable ramp up/down gain during operation of the audio amplifier. The variable ramp up/down gain may be implemented as a pulse width modulation (PWM) modulator/generator with a ramp-up and ramp-down gain under control of the controller. The variable ramp up/down gain smooths transitions of the offset between a pre-power stage block and a feedback loop and thus can reduce audible pops and clicks by reducing the offset that is amplified in the power stage block of the audio amplifier.
Public/Granted literature
- US20160118949A1 AMPLIFIER WITH ADJUSTABLE RAMP UP/DOWN GAIN FOR MINIMIZING OR ELIMINATING POP NOISE Public/Granted day:2016-04-28
Information query
IPC分类: