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:
Nov. 03, 2009
Filed:
Nov. 15, 2004
Katsumasa Hijikata, Osaka, JP;
Joji Hayashi, Osaka, JP;
Katsumasa Hijikata, Osaka, JP;
Joji Hayashi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A mixer circuit of a receiving system, requiring low noise characteristics at lower frequency, includes a bypass current source () which is connected in parallel with an LO transistor () between an IF output terminal () and a drain terminal of an RF transistor (), and a bypass current source () which is connected in parallel with an LO transistor () between an IF output terminal () and the drain terminal of the RF transistor (), thereby decreasing a current flowing through the LO transistors () without decreasing a bias current flowing through the RF transistor (). Accordingly, it is possible to suppress flicker noises occurring from the LO transistors () without lowering the gain of the mixer, thereby realizing a mixer circuit with excellent low frequency noise characteristics, which can improve the NF characteristics at lower frequency.