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:
Feb. 16, 1999
Filed:
Apr. 01, 1997
Gary L Wagner, Menlo Park, CA (US);
Louis J Dietz, Mountain View, CA (US);
Trimble Navigation Limited, Sunnyvale, CA (US);
Abstract
A frequency synthesizer comprises a voltage controlled oscillator (VCO) with an output frequency f.sub.out that is dependent on a VCO-control voltage input. A divide-by-k counter is connected to receive the output frequency f.sub.out and to output a pair of in-phase and quadrature phase signals f.sub.k. A vector modulator is connected to receive the in-phase and quadrature phase signals f.sub.k and the output frequency f.sub.out, and outputs a single sideband (SSB) modulated output f.sub.n comprising only one of the sum (f.sub.out +f.sub.k) or difference (f.sub.out -f.sub.k) products. A divide-by-n counter is connected to receive the modulated output f.sub.n and to output a feedback frequency sample f.sub.f. And a phase detector is connected to receive the feedback frequency sample f.sub.f and to compare it with a reference frequency f.sub.r. A phase error output signal is provided for the VCO-control voltage input.