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:
Jun. 02, 2009
Filed:
Sep. 16, 2005
Kazuhiro Uchiyama, Shizuoka, JP;
Shinji Ohkawa, Kanagawa, JP;
Kazuhiro Uchiyama, Shizuoka, JP;
Shinji Ohkawa, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An EER high frequency amplifier wherein the dynamic range of the gain can be widened by performing a predetermined control of a device in a high frequency amplifying part and thereby enhancing the isolation within the device. In an EER high frequency amplifier (), an envelope detecting part () extracts an amplitude signal from an input high frequency signal, while a limiter () extracts a phase signal therefrom. A baseband amplifying part () generates a voltage in accordance with the amplitude signal and supplies it as the drain voltage of a GaAs FET () of a high frequency amplifying part (). When the drain voltage is below a predetermined first reference voltage, a gate voltage control part () holds an initially established gate voltage. When the drain voltage exceeds the first reference voltage, the gate voltage control part () so controls the gate voltage as to be proportional to the drain voltage. Moreover, when the drain voltage is above a second reference voltage that is higher than the first reference voltage, the gate voltage control part () holds the initially established gate voltage. When the drain voltage is below the second reference voltage, the gate voltage control part () so controls the gate voltage as to be proportional to the drain voltage.