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:
Jan. 01, 1991
Filed:
Sep. 09, 1988
Gregory J McBrien, Cromwell, CT (US);
David M Cramp, Bristol, CT (US);
Winthrop H McClure, Farmington, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A sawtooth voltage is applied to an integrated optic phase modulator by means of a high impedance variable current source in response to a charge rate control signal. The phase modulator's capacitance accumulates the charge which manifests a voltage comprising the sawtooth signal. The sawtooth signal is also provided to a comparator which in turn provides a discharge signal upon detecting the sawtooth voltage as being greater than a selected reference signal magnitude. The discharge signal is provided to a means for discharging the accumulated charge from the capacitance of the integrated optic phase modulator. A compensating resistor may be connected between the current source and the phase modulator to automatically correct for sawtooth overshoot. Various data extraction techniques are disclosed, without limiting the invention since others may be used, including counting sawtooth resets, among others, and using a current splitter to store charge separately from the serrodyne modulation circuit and relating separately stored charge to angle or rate.