Abstract: A fingerprint sensor in accordance with an exemplary embodiment includes a sensor plate including a plurality of cells, a driving signal generation unit disposed between an external voltage input terminal and the sensor plate to generate a driving signal, an active output voltage feedback unit disposed between one end of a variable capacitor and a voltage output terminal, and a shielding plate provided below the sensor plate and connected to an output terminal of the active output voltage feedback unit to block a noise generated from a circuit disposed below the sensor plate. Here, the fingerprint sensor further includes a driving signal control switch having one end connected to the driving signal generation unit and the other end connected to each of the plurality of cells of the sensor plate to set at least a portion of the plurality of cells of the sensor plate as a sensing cell and at least a portion of cells disposed around the set sensing cells as a driving cell.

Abstract: A fingerprint recognition device for capacitance detection according to an embodiment of the present invention includes: a fingerprint sensor cell array including a plurality of cells connected to a plurality of row lines and a plurality of column lines, a plurality of column line assemblies constituting a specific number of column lines of the fingerprint recognition cell arrays, a variable cycle clock generator operable to operate a pipeline process performed for each column line belonging to the column line set, and a multi-column line selector for selecting one column line among the column lines of the cell array. The variable cycle clock generator may sequentially control an integration operation for each column line belonging to the column line set at different times.

Abstract: A charge transfer circuit for capacitive sensing is disclosed. The charge transfer circuit for capacitive sensing includes a variable capacitor, an X-drive unit, and an active output voltage feedback (AVF) part. The variable capacitor is disposed between the output terminal of an X-drive line and the input terminal of a Y-drive line. The X-drive unit is connected between the input unit of the X-drive line and a voltage input terminal. The active output voltage feedback (AVF) part is connected between the output terminal of the Y-drive line and a voltage output terminal. The output terminal of the AVF part is connected to the output terminal of the Y-drive line.