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. 26, 1995
Filed:
Jun. 07, 1995
Applicant:
Inventors:
Tzu-Wang Pan, Irvine, CA (US);
Jenn-Gang Chern, Yorba Linda, CA (US);
Assignee:
Silicon Systems, Inc., Tustin, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
327157 ; 327148 ; 327-7 ; 327551 ; 331 17 ;
Abstract
A timing acquisition circuit using a phase locked loop with programmable damping for either Type A or Type B phase detectors is described. In the damping scheme for a Type A phase detector, a resistance (R1) is simulated by adding an equivalent voltage Veff to the capacitor voltage. The equivalent voltage Veff is generated internally, so that programmable damping is made possible. In Type B phase detectors, a variable gain amplifier is used to control the effective resistance (R1) of the loop filter.