US 11,909,362 B2
Amplifier circuitry
John Paul Lesso, Edinburgh (GB)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Jun. 8, 2022, as Appl. No. 17/835,326.
Application 17/835,326 is a continuation of application No. 17/061,803, filed on Oct. 2, 2020, granted, now 11,387,793.
Claims priority of provisional application 62/910,592, filed on Oct. 4, 2019.
Claims priority of application No. 2002158 (GB), filed on Feb. 17, 2020.
Prior Publication US 2022/0329219 A1, Oct. 13, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H03F 3/217 (2006.01); H03F 1/34 (2006.01)
CPC H03F 3/217 (2013.01) [H03F 2200/129 (2013.01); H03F 2200/165 (2013.01)] 16 Claims
OG exemplary drawing
 
1. Amplifier circuitry comprising:
a forward signal path for receiving an input signal and outputting an output signal;
a feedback path operable to provide a feedback signal derived from the output signal;
a feedforward path operable to provide a feedforward signal derived from the input signal;
a combiner operable to determine an error signal based on a difference between the feedback signal and the feedforward signal; and
a controller for selectively controlling a loop gain factor;
wherein the amplifier circuit is selectively operable to vary the loop gain factor so as to vary an extent to which the error signal contributes to the forward signal path; and
wherein the feedforward path comprises a compensation module configured to apply a controlled transfer function to the feedforward signal such that an overall transfer function for the amplifier circuit is substantially the same for different values of the loop gain factor.