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:
May. 04, 1993
Filed:
Sep. 23, 1991
Andrew C Graham, Sunnyvale, CA (US);
Robert C Burd, San Jose, CA (US);
TriQuint Semiconductor, Inc., Santa Clara, CA (US);
Abstract
A circuit is which, when used in a voltage controlled oscillator (VCO) circuit, detects a frequency on the output of the VCO and, if this output frequency is above a certain value, the circuit forces the output frequency of the VCO to decrease until it is below the certain value. This acts to keep the output frequency of the VCO below a selected frequency which can be accurately processed by the feedback circuits driven by the VCO. Once the output frequency of the VCO is below the certain value, the circuit stops forcing the output frequency to decrease, and the circuit becomes transparent. At this point, the conventional feedback circuitry driving the VCO takes over the adjustment of the VCO output frequency.