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:
Jun. 16, 1998
Filed:
Sep. 30, 1996
Sony Corporation, Tokyo, JP;
Abstract
A PLL circuit which is used as a reproducing clock forming circuit of a digital signal reproducing apparatus. The PLL circuit is strong against noises and has stable characteristics. Comparison outputs of a phase comparator 3 are outputted in a form of balance (differential) signals and are supplied to a loop filer 4. Output signals of the loop filter 4 are supplied to control voltage input terminals of a VCO 5 in a form of the balance signals. In-phase components of the noises included in control voltages can be cancelled. Time constants of the loop filter can be switched by bipolar transistors Tr31 and Tr32. A balance of the balance signals is not broken by base currents of the transistors Tr31 and Tr32.