US 12,283,929 B2
Audio amplifier circuitry
David P. Singleton, Edinburgh (GB); Andrew J. Howlett, Edinburgh (GB); and John B. Bowlerwell, Edinburgh (GB)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Nov. 28, 2023, as Appl. No. 18/521,667.
Application 18/521,667 is a continuation of application No. 17/142,904, filed on Jan. 6, 2021, granted, now 11,881,826.
Claims priority of provisional application 62/968,261, filed on Jan. 31, 2020.
Claims priority of application No. 2002541 (GB), filed on Feb. 24, 2020.
Prior Publication US 2024/0097633 A1, Mar. 21, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H03F 3/45 (2006.01)
CPC H03F 3/45659 (2013.01) [H03F 3/45179 (2013.01); H03F 3/45645 (2013.01); H03F 2200/03 (2013.01); H03F 2203/45084 (2013.01); H03F 2203/45402 (2013.01); H03F 2203/45592 (2013.01)] 18 Claims
OG exemplary drawing
 
1. Circuitry comprising:
audio amplifier circuitry for receiving an audio signal to be amplified;
first and second output nodes for outputting first and second differential output signals; and
an output clamp switch coupled between the first and second output nodes, to selectively couple the first and second output nodes to each other;
wherein the circuitry further comprises common mode buffer circuitry configured to selectively output a common mode signal to the first and second output nodes; and
low pass filter circuitry having an input that is configured to receive a common mode voltage and an output coupled to an input of the common mode buffer circuitry.