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:
Oct. 26, 1993
Filed:
Oct. 15, 1991
Seiichi Nishiyama, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
Disclosed is a wide band amplifier comprising a first differential connection circuit made of a first and a second transistor differentially interconnected, a second differential connection circuit made of a third and a fourth transistor differentially interconnected, and a level shift circuit interposingly provided between a load resistance and a power supply. The load resistance is connected to the collector of the first transistor. The bases of the first and the third transistors are supplied with a voltage for gain determination. Furthermore, the bases of the first and the third transistors are supplied with a predetermined operating voltage. The voltage of the level shift circuit is fed to the collector of the fourth transistor. In this setup, the voltage to the load resistance connected to the collector of the first transistor is varied depending on the magnitude of the current flowing through the fourth transistor.