Patent ID: 9190971
Filing Date: 2015-11-17
Classification: G01R,H03G,H03K

Abstract:
1. A signal processing apparatus comprising: a signal path for a signal, the signal path comprising a signal processing stage and a variable gain stage for applying a gain to the signal in the signal path; and an auxiliary stage coupled to an input of the signal processing stage, to receive a signal in the signal path at the input of the signal processing stage, where the auxiliary stage has a threshold, and the auxiliary stage is operative to generate a control signal indicating crossing the threshold in the auxiliary stage by the signal, wherein the threshold is arranged in the auxiliary stage to be equal to a quiescent DC level at an output of the signal processing stage; and wherein the variable gain stage is arranged to receive the control signal and to determine timing of an adjustment to the gain applied to the signal in the signal path in response to the control signal.