Patent ID: 8023667

Claim:
A Micro-Electro-Mechanical Systems (MEMS) capacitive sensing circuit for amplifying and outputting a received detecting signal, comprising: an amplifier with a first input node and a second input node for amplifying and outputting said detecting signal, wherein said first input node and said second input node have different polarity; at least a MEMS capacitive sensing device, coupled to a bias node and said first input node, for generating said detecting signal to said amplifier; at least a matching capacitor, coupled to said bias node and said second input node, wherein a capacity value of said matching capacitor is matching to an inner capacity value of said MEMS capacitive sensing device; a first resistance, coupled to said MEMS capacitive sensing device and said amplifier, for biasing said MEMS capacitive sensing device to a ground node; and a second resistance, coupled to said matching capacitor and said amplifier, for biasing said matching capacitor to said ground node.