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:
Feb. 22, 2005
Filed:
Aug. 28, 2003
Applicants:
Daisuke Watanabe, Osaka, JP;
Junji Itoh, Osaka, JP;
Ikuo Imanishi, Shiga, JP;
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F007/556 ;
U.S. Cl.
CPC ...
Abstract
A mixer circuit is composed of a differential amplifier circuit and a DBM circuit. The differential amplifier circuit has a first bipolar transistor, a second bipolar transistor, a first resistor provided between the respective bases of the first and second bipolar transistors, and a capacitor provided between the base of the second bipolar transistor and the ground. Since the first resistor and the capacitor are provided such that the circuit undergoes RC oscillation in response to the third harmonic of an input signal, the third and higher-order harmonics can be reduced.