Abstract
In this paper, a novel capacitive sensing scheme for fingerprint acquisition is presented. Based on capacitive fingerprint sensing, a novel capacitive sensor structure and readout circuit are proposed to grab the induced capacitance by the finger directly touched to the sensor plate. A test array of 32x32 capacitive fingerprint sensors is implemented in a standard CMOS 0.35-μm technology. Including the sensor array and peripheral digital control circuit, the chip area is 2550x1890μm2.
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