Patent ID: 8487661
Filing Date: 2013-07-16
Classification: H03G

Abstract:
1. A zero-crossing gain control system, comprising: a gain control unit, comprising an input end configured to receive an input signal, and an output end configured to provide an output signal, and a control end configured to receive a gain control signal; a zero-crossing monitoring circuit coupled to the output end or the input end of the gain control unit, wherein the zero-crossing monitoring circuit is responsive from either the input signal or the output signal of the gain control unit, and is operable to generate a zero-crossing signal when the output signal or the input signal crosses zero; and a register coupled between the zero-crossing monitoring circuit and the control end of the gain control unit, configured to latch a digital control signal and generates the gain control signal according to the zero-crossing signal and the digital control signal and further comprising: a maximum write time setting circuit, coupled between the zero-crossing monitoring circuit and the register, responsive from the zero-crossing signal and the digital control signal, and is operable to generate a write signal.