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. 01, 1986
Filed:
Mar. 06, 1984
Applicant:
Inventor:
Hideaki Ito, Kawasaki, JP;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 62 ; 360 68 ;
Abstract
A switching circuit for AC bias signal has an input terminal for inputting an input signal into the switching circuit and a first transistor connected to the emitter of the input terminal. A second transistor is connected at the collector to the collector of the first transistor. The emitter area of the second transistor is larger than that of the first transistor so that the dynamic resistances of the these transistors are equal to each other when these resistors are ON state. The emitter of the second transistor is connected to the reference voltage terminal supplied with ground voltage. The first and second transistors are controlled in conduction by a control signal as input.