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. 22, 2005
Filed:
Apr. 03, 2002
Haruhiko Koizumi, Suita, JP;
Katsushi Tara, Kyoto, JP;
Haruhiko Koizumi, Suita, JP;
Katsushi Tara, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a frequency conversion circuit capable of reducing current without impairing high frequency characteristics. A local oscillator amplifier is formed of a first field effect transistor. A source thereof is grounded by a first capacitor in terms of high frequency, and a gate thereof is connected to one end of each of first and second resistors. The other end of the first resistor is grounded, and the other end of the second resistor is connected to a voltage supply terminal. An intermediate frequency amplifier is formed of a second field effect transistor. A source thereof is grounded through a third resistor and a second capacitor that are connected in parallel with each other. A drain thereof is connected to an intermediate frequency signal output terminal through a third capacitor and an intermediate frequency output matching circuit. The source of the first field effect transistor and the drain of the second field effect transistor are connected through an AC blocking circuit.