Patent ID: 9716476
Date: 2017-07-25
CPC Classifications: H03F,H03K

Claim:
1. DC offset compensation circuitry for compensating for DC offset in an audio signal path wherein said compensation circuitry is multiplexed between a first feedback loop for compensating for offset in a first part of the audio signal path and a second feedback loop for compensating for offset in a second part of the audio signal path, wherein said compensation circuitry is configured to operate with said first feedback loop to generate a first DC offset compensation value derived for the first part of the audio signal path and subsequently to operate with said second feedback loop to generate a second DC offset compensation value derived for the second part of the audio signal path, said first and second DC offset compensation values being used to generate a first and second compensation signals respectively that are applied simultaneously at different points of the audio signal path, wherein the compensation circuitry is configured such that the same input to the compensation circuitry from the audio signal path is used in both the first and second feedback loops.