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:
Sep. 27, 1994
Filed:
Aug. 02, 1993
Osamu Ichiyoshi, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A frequency synthesizer is composed of a reference oscillator, the first and the second integrators, a binary adder, a low pass filter and VCO forming a Phase Locked Loop (PLL). The first integrator, driven by the timing of a reference oscillator, integrates an externally supplied value K and generates the input signal. The second integrator, driven by the output signal of the VCO of the PLL, integrates an externally supplied value L. The binary adder detects the difference between the outputs of the first and the second integrators functioning as a phase comparator. The output of the phase comparator is converted into an analog voltage which is filtered to control the VCO to achieve frequency synthesis by the phase lock function of the loop.