US 12,323,112 B1
Signal amplifier
Anthony Gribben, Edinburgh (GB)
Assigned to Renesas Design (UK) Limited, Bourne End (GB)
Filed by Dialog Semiconductor (UK) Limited, London (GB)
Filed on Oct. 29, 2021, as Appl. No. 17/514,280.
Int. Cl. H03F 3/217 (2006.01); H04R 3/02 (2006.01); H04R 3/04 (2006.01)
CPC H03F 3/217 (2013.01) [H04R 3/02 (2013.01); H04R 3/04 (2013.01); H03F 3/2173 (2013.01); H03F 2200/03 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A signal amplifier comprising:
a power converter;
an H-bridge circuit;
a modulator circuit adapted to generate a first logic signal to control the H-bridge circuit and a second logic signal to control the power converter, wherein the first logic signal is generated by comparing an input signal with a first waveform; and wherein the second logic signal is generated by comparing the input signal with a second waveform;
wherein the power converter is adapted to provide a first voltage and a second voltage; and
wherein the H-bridge circuit has a first input terminal to receive the first voltage, a second input terminal to receive the second voltage and a pair of output terminals for providing an output modulated voltage to a load,
the H-bridge circuit being adapted to generate the output modulated voltage using a primary modulation when the second logic signal is in a first logic state and using a secondary modulation when the second logic signal is in a second logic state.