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. 15, 1990
Filed:
Jul. 19, 1989
Applicant:
Inventor:
Alan N Schenberg, Kinnelon, NJ (US);
Assignee:
ITT Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 / ; 331 17 ; 328134 ; 328155 ; 307516 ;
Abstract
A phase detector for a phase locked loop (PLL) to be employed in a wideband synthesizer generates a ramp waveform at an output. The ramp waveform has a positive slope during the reference signal; when a sample pulse is received by the circuitry, the slope of the ramp is changed to a negative slope. Hence, the output of the detector will be negative or positive depending upon the difference in phase between the reference and sample frequencies. The ramp voltage is sampled and held by a suitable circuit which provides an error signal for controlling a VCO.