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:
Aug. 21, 2007
Filed:
Feb. 02, 2005
Noboru Sasho, Kanagawa, JP;
Norio Shoji, Kanagawa, JP;
Noboru Sasho, Kanagawa, JP;
Norio Shoji, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A bias-voltage supply circuit of a radio-frequency amplification circuit has the constant-voltage power supply generating a constant voltage higher than the bias voltage, a rectifier transistor and a constant-current power supply supplying a constant current to the rectifier transistor. The rectifier transistor is connected between a supply point of a bias voltage connected to an input terminal of the radio-frequency amplification transistor via an element for bias supply and a power supply voltage supply line, wherein a control terminal is kept by the constant voltage that the constant-voltage power supply generates. Since descent of the electric potential of the input terminal of a radio-frequency signal does not arise because of circuit composition, the radio-frequency amplification circuit has a good saturation characteristic.