Resources Contact Us Home
Capacitance detector circuit, capacitance detection method, and fingerprint sensor using the same

Image Number 12 for United States Patent #7075316.

A capacitance detecting circuit of a capacitive sensor having a plurality of column lines and a row line intersecting the column lines detects a change in capacitance at an intersection of a column line and a row line. The circuit includes a PN code generating unit for generating a code having orthogonality in time sequence to output the generated code as a column drive signal, a column line drive unit for driving a predetermined one of the column lines which are selected in response to the code, a capacitance detecting unit, connected to the row line, for detecting a voltage by converting a total sum of changes in capacitance at intersections of the selected column lines into the voltage to output the detected voltage, and a decode processing unit for performing a predetermined calculation on the detected voltage output from the capacitance detecting unit and the code to determine a voltage value responsive to the capacitance change at the intersection.

  Recently Added Patents
Method and apparatus for controlling peak amplifier and doherty power amplifier
Light emitting device and light emitting device package
Printed wiring board with reinforced insulation layer and manufacturing method thereof
Transmission channel for ultrasound applications
Adjustable voltage regulator with dynamic voltage compensation
Method and structure for image local contrast enhancement
Alkaline battery
  Randomly Featured Patents
Handheld electronic device
Steering system for cold environments
Transfer and replication arrangement for magnetic bubble memory devices
Control pod for a microphone and headset
Reflective insulative panel
Pyrazole derivatives as cannabinoid receptor modulators
Heater stack having resistive layer with underlying insulative gap and method for making heater stack
Computer peripheral for scanning
Thermosetting resin composition, resin sheet and resin sheet for insulated substrate
Fibre channel interface apparatus and methods