Patent ID: 8787597

Claim:
A system comprising: first and second pin interfaces; a first audio signal driver circuit having its output coupled to the first pin interface, wherein the first audio signal driver circuit is configured to be fed at its input with a first audio input signal; a second audio signal driver circuit having its output coupled to the second pin interface, wherein the second audio signal driver circuit is configured to be fed at its input with a second audio input signal; and a pre-biasing circuit coupled to the input of the first audio signal driver circuit and to the input of the second audio signal driver circuit, wherein the pre-biasing circuit is configured to: provide an offset correction signal to the first audio signal driver circuit during power up of the first audio signal driver circuit when the DC offset at the first pin interface is different from the DC offset at the second pin interface; ramp the offset correction signal to create a ramped correction signal; and provide the ramped correction signal to the second audio signal driver circuit during power up of the second audio signal driver circuit while providing the offset correction signal to the first audio driver circuit.