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. 14, 1985
Filed:
May. 03, 1983
Applicant:
Inventor:
Koichi Sakai, Tokyo, JP;
Assignee:
Toko, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H / ;
U.S. Cl.
CPC ...
323352 ; 307264 ; 323315 ;
Abstract
A variable impedance circuit is disclosed which comprises a pair of diodes having their cathodes connected together, a first current source coupled to the connection between the diodes, and a second and a third current source which are connected to the anodes of the diodes respectively. The second and third current sources are controlled by means of current mirror circuits so that equal forward currents are caused to flow therefrom to the paired diodes, thus making it possible to set up a desired impedance variation range.