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. 19, 1992
Filed:
Feb. 06, 1991
Applicant:
Inventor:
Ikuo Terado, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G / ;
U.S. Cl.
CPC ...
307494 ; 307511 ; 358337 ; 358227 ;
Abstract
A frequency and/or phase characteristic control circuit comprising a current multiplier and an operational amplifier, the current multiplier containing a pair of diode junctions and a transistor arrangement for differential amplification, the operation amplifier having a capacitor connected to the out-of-phase input terminal thereof. The multiplying ratio of the current multiplier is varied so as to control the frequency and/or phase characteristic. This makes the circuit conducive to being implemented in an IC (integrated circuit). This circuit is particularly suitable for use as a circuit that switches the servo circuits of a laser disc player and a compact disc player.