The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2003
Filed:
Sep. 07, 2001
Alessandro Mortara, Lausanne, CH;
Peter Masa, Les Hauts Geneveys, CH;
Pascal Heim, Bevaix, CH;
Friedrich Heitger, Bern, CH;
Bishop Innovation Limited, North Ryde, AU;
Abstract
An electronic circuit for measuring the position of a spatially periodic intensity pattern of incident radiation includes an array of detectors ( ); two or more correlator units ( ) each having arrays of capacitors ( ) connected to a buffer ( ); and a phase angle computing unit ( ). The pitch of the array of detectors ( ) is smaller than the pitch of the incident intensity pattern so that the latter is oversampled, yielding high accuracy. The detector outputs ( ) are weighted by respective fixed capacitance values ( ) which vary periodically along arrays of capacitors ( ), and a weighted sum of outputs for each correlator unit ( ) is output at its respective buffer ( ). The capacitance values ( ) of respective correlator units ( ) are mutually offset by a predetermined phase shift. The analog computation using capacitor arrays ( ) is fast and energy efficient, and can be implemented as a VLSI circuit.