Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Solar power system with communication network utilizing magnetic fields
Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population
Image forming device
Routing of data including multimedia between electronic devices
Device for installing conducting components in structures
Electric motor
Weighted determination in configuration management systems
  Randomly Featured Patents
Robot control device and robot system
Safety valve assembly
Universal flip-up attachment for helmets
Beauty steaming-bed
Methods, systems, and computer program products for providing an enriched messaging service in a communications network
Automated process equipment
Preparation of N-aryl-substituted 2-aminoalkyl-2-hydroxyalkylamines and N-aryl-substituted piperazines
Coding selection method
Printer for electronic computer
Key support device