Amplifying circuit and touch control sensing system

摘要

An amplifying circuit, which comprises: an amplifier, comprising a signal input terminal and a signal output terminal; a first current sinking module, for sinking a third current from the signal input terminal; and a noise sensing module, for sensing a output voltage level at the signal output terminal, for controlling the first current sinking module to sink the third current from the signal input terminal if the output voltage level is larger than a first high threshold value, and for controlling the first current sinking module not to sink the third current if the output voltage level is smaller than the first high threshold value.

主权项

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.