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. 25, 1976
Filed:
Nov. 18, 1974
William J Tanis, Wayne, NJ (US);
Engelmann Microwave Co., Montville, NJ (US);
Abstract
A frequency synthesizer or portion thereof, that includes only one main phase-locked loop. The phase-lock loop includes a digital divider that can effectively divide in fractions, thus, permitting use of a higher reference frequency than normally required for the same degree of frequency resolution in integer divisor synthesizers. This, in turn, increases the short-term stability and reduces phase-noise. The fractional divider includes a secondary phase-lock loop that tends to introduce an unwanted ramp signal which causes spurious sidebands in the output signal. These spurious sidebands, when objectionable, are effectively suppressed by a circuit that generates a second ramp signal of similar frequency, duration and shape to the unwanted ramp signal but of opposite phase.