US 11,424,720 B2 · Audio power amplifier for reduced click and pop (CnP)

Abstract

A power amplifier provides reduction of click and pop in audio applications. The power amplifier includes a first amplifier and an auxiliary amplifier. The auxiliary amplifier is used to ramp the power amplifier output from ground to an offset voltage to reduce the “click and pop” sound. The first amplifier and the auxiliary amplifier having a shared feedback loop. An output of the first amplifier and an output of the auxiliary amplifier may be switchably coupled to the shared feedback loop. A wave generator controls a switch to couple the first amplifier output or the auxiliary amplifier output to the shared feedback loop.

Claims14

Dependent claims

A power amplifier comprising:

a first amplifier;
and
an auxiliary amplifier, the first amplifier and the auxiliary amplifier having a shared feedback loop, a first resistance along a first signal path for the first amplifier matching a second resistance along a second signal path for the auxiliary amplifier.

Dependencies are inferred from the claim text.

Facts

Application

16/827,280Filed 23 Mar 2020

Published

US 2021/0297046 A123 Sep 2021

Granted

23 Aug 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

H03F 1/0288
In transistor amplifiers: using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using…
H03F 1/526
Circuit arrangements for protecting such amplifiers: protecting by using redundant amplifiers
H03F 3/187
With semiconductor devices only: in integrated circuits
H03F 3/211
With semiconductor devices only: using a combination of several amplifiers

Audio power amplifier for reduced click and pop (CnP)

Life of this patent

Audio power amplifier for reduced click and pop (CnP)

Life of this patent

Abstract

Claims14