Techniques for DC offset cancellation are described. According to one embodiment, an amplifier has at least one output and first and second supply rails. The amplifier includes offset cancellation logic which is operable in a calibration mode to generate a first offset cancellation signal when the at...http://www.google.de/patents/US7026866?utm_source=gb-gplus-sharePatent US7026866 - DC offset self-calibration system for a switching amplifier
