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:
Dec. 13, 1988
Filed:
Dec. 15, 1987
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A microwave band frequency synthesizer comprises first and second phase-locking loops. The first phase-locking loop includes a first voltage controlled oscillator, a variable frequency divider and a first multiplier and generates an output signal whose frequency changes at the rate of a unit frequency change width of the oscillator. The second phase-locking loop includes a first fixed frequency divider for frequency-dividing the output signal of the first phase-locking loop to provide a phase comparison reference signal of a frequency higher than that phase-compared in the first phase-locking loop, a second voltage controlled oscillator, a second fixed frequency divider for frequency dividing an output of the second voltage controlled oscillator, a second phase comparator for phase-comparing a frequency-divided an output signal of the second fixed frequency divider and the phase comparison reference signal in order for phase-locking of the second voltage controlled oscillator, and a second multiplier for multiplying the output signal from the second voltage controlled oscillator to provide a microwave band signal.