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
Expressive grouping for language integrated queries
PC secure video path
Switching device, switch control method, and storage system
Creating three dimensional graphics data
Error recovery storage along a memory string
Personal warming apparatus
Dynamic lookup service in a distributed system
  Randomly Featured Patents
Stacked microstrip patches
Methods for manipulation of air flow into aquifers
Light guide including optical scattering elements and a method of manufacture
Memory system with nonvolatile memory
1-N-isoserylkanamycins and the production thereof
Remotely replaceable tokamak plasma limiter tiles
Multi-functional electrical stimulation system
Electrical capacitance proximity sensor