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
Luggage wheel housing with wheel
Global codebook for coordinated multi-point processing
Modular microscope construction
Light-reflective anisotropic conductive paste and light-emitting device
Fingerprinting apparatus, system, and method
Semiconductor device, integrated circuit and method of manufacturing an integrated circuit
Lacrosse head
  Randomly Featured Patents
Method of profiling a cell population
Ladder stabilizer
Method of forming an image with photographic likeness on chocolate and product thereof
Chloro-pyridinyloxymethyl esters of thiocyanic acid
Process for the production of ultrafine particles
Amusement machine including a game of chance in combination with a crane game operable in response to a win on the game of chance
Method for preparing aluminum nitride and its sinter
Inductive device including bond wires
Image capturing apparatus
Cable clamp having a base with a tapered hole and a sleeve with a tapered outer wall to clamp a cable in-between