Patent ID: 9197167
Filing Date: 2015-11-24
Classification: G06F,H03F

Abstract:
1. An amplifying circuit, comprising: an amplifier, comprising a signal input terminal and a signal output terminal; a first current providing module, for providing a first current to the signal input terminal; a noise sensing module, for sensing a output voltage level from the signal output terminal, for controlling the first current providing module to provide the first current if the output voltage level is less than a first low threshold value, and for controlling the first current providing module not to provide the first current if the output voltage level is larger than the first low threshold value; and a second current providing module, for providing a second current to the signal input terminal; wherein the noise sensing module controls the second current providing module to provide the second current and the first current providing module to provide the first current if the output voltage level is less than a second low threshold value smaller than the first low threshold value, and controls the second current providing module not to provide the second current if the output voltage level is between the first low threshold value and the second low threshold value.