Patent ID: 11881826
Assignee: CIRRUS LOGIC INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 21:
22. A circuitry comprising:
audio amplifier circuitry for receiving an audio signal to be amplified; and
first and second output nodes for outputting first and second differential output signals, wherein the circuitry further comprises:
common mode buffer circuitry; and
low pass filter circuitry;

wherein the low pass filter circuitry has an input that is configured to receive a common mode voltage and an output coupled to an input of the common mode buffer circuitry and the common mode buffer circuitry is configured to selectively output a common mode signal to the first and second output nodes; and
wherein the amplifier circuitry comprises:
a dummy output stage;
a dummy feedback path for selectively coupling an output of the dummy output stage to an input of the amplifier unit;
a real output stage; and
a real feedback path for selectively coupling an output of the real output stage to the input of the amplifier unit.