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:
Jul. 02, 1996
Filed:
Jan. 19, 1995
Applicant:
Inventor:
Sadao Igarashi, Soma, JP;
Assignee:
Alps Electric Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330300 ; 330311 ;
Abstract
A high-frequency amplifier has a first signal amplifier which includes a field effect transistor, and a constant-current circuit which is direct current connected, as well as cascade-connected, to the field effect transistor for maintaining a constant drain current of the field effect transistor. This constant-current circuit also acts as a second amplifier. The constant-current circuit may comprise a bipolar transistor or temperature compensation circuit. In this high-frequency amplifier, its gain and noise figure are stable against ambient temperature changes and power consumption efficiency is improved. This high-frequency amplifier is also suitable for mass production.