公开(公告)号：US20180337636A1

公开(公告)日：2018-11-22

申请号：US15984250

申请日：2018-05-18

Applicant: Avnera Corporation

Inventor： Gilbert C. Martinez ,  Amit Kumar ,  Ali Hadiashar ,  Mark Gehring ,  Wai Lee

IPC: H03F1/02 ,  H03F3/183 ,  H03M1/00 ,  H03M3/00 ,  H03G3/30

Abstract: An audio system can include an amplifier having two parallel drivers, one having common source transistors and one having common drain transistors, also called source following. At low signals, the source followers dominate the open-loop gain signal path, while large signals cause the common source transistors to be dominant. At low signal amplitudes, the common source transistor gain is reduced and the common drain transistors provide the load current. At a pre-determined level of signal amplitude, the common source transistors take over and provide the current load. A calibration system for a DAC is also provided. The calibration system measures individual cell performance in the DAC, then stores its digital equivalent in a coefficient storage. Then, a quantizer can refer to the stored coefficients when selecting the appropriate final quantized digital value.