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
Frequency offset estimation apparatus and method of OFDM system
Transactional consistency scheme
Systems and method for automatic color plane misregistration calibration
Systems and methods for printing images outside a normal color gamut in image forming devices
Method and device for operating a vehicle having a hybrid drive
Liquid composite compositions using non-volatile liquids and nanoparticles and uses thereof
Power supply system for a data storage system and a method of controlling a power supply
  Randomly Featured Patents
Logic circuit for part detector
Slit radiography device provided with absorption elements, and procedure for producing absorption elements
Printer having main and auxiliary pin tractor units
Method and apparatus for visualizing a tomographic volume data record using the gradient magnitude
Laminate security feature
Aberration measuring method
Outdoor portable charcoal gas grill
Laser patterning of encapsulated organic light emitting diodes
Stackable chafer assembly
Detergent composition having a plasma-induced, water soluble coating and process for making same