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:
Apr. 09, 1991
Filed:
May. 21, 1990
William A Buchan, Corona del Mar, CA (US);
John J Quintus, Buena Park, CA (US);
Archive Corporation, Costa Mesa, CA (US);
Abstract
A phase locked loop circuit including ramp generating circuitry for generating a dual slope ramp signal having alternating positive and negative slopes that are controlled by the level of the control signal, and sampling circuitry responsive to sample command pulses for providing a sample output representative of the level of the dual ramp signal at the time of sampling. The sample output is provided to a loop which provides the control signal for the ramp generating circuit. Also disclosed is a phase locked loop having ramp generating circuitry for generating a ramp signal, and track and hold circuitry having a plurality of track/hold capacitors that are controlled to track the ramp voltage or hold the ramp signal voltage in response to a sample command signal, such that only a capacitor that is tracking is switched to hold the ramp voltage in response to the sample command signal.