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:
Mar. 30, 1999
Filed:
Jul. 07, 1997
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330302 ; 330310 ;
Abstract
A microwave power amplifier having n stages (n is an integer of at least two), which uses bipolar transistors as amplifying elements. Grounded electrodes, bias applying methods, and bias values of the bipolar transistors of the respective stages are set so that phase rotations of output powers of bipolar transistors of m stages (m is an integer of 1.ltoreq.m.ltoreq.n-1) among the n stages are canceled by phase rotation of at least one of the other bipolar transistors of the (n-m) stages. Therefore, the total phase rotation of the power amplifier can be neutralized, resulting in a microwave power amplifier having excellent distortion characteristics.