Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2005-09-16
2009-06-02
Shingleton, Michael B (Department: 2815)
Amplifiers
Modulator-demodulator-type amplifier
C330S126000, C330S298000, C455S127100
Reexamination Certificate
active
07541865
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 (1), an envelope detecting part (2) extracts an amplitude signal from an input high frequency signal, while a limiter (3) extracts a phase signal therefrom. A baseband amplifying part (4) generates a voltage in accordance with the amplitude signal and supplies it as the drain voltage of a GaAs FET (5a) of a high frequency amplifying part (5). When the drain voltage is below a predetermined first reference voltage, a gate voltage control part (6) holds an initially established gate voltage. When the drain voltage exceeds the first reference voltage, the gate voltage control part (6) 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 (6) holds the initially established gate voltage. When the drain voltage is below the second reference voltage, the gate voltage control part (6) so controls the gate voltage as to be proportional to the drain voltage.
REFERENCES:
patent: 5847602 (1998-12-01), Su
patent: 6681101 (2004-01-01), Eidson et al.
patent: 7145396 (2006-12-01), Dupuis
patent: 08222973 (1996-08-01), None
patent: 10256843 (1998-09-01), None
patent: 3207153 (2001-07-01), None
International Search Report dated Dec. 27, 2005.
Masaomi Suzuki, “New Low Frequency/High Frequency Circuit Design Manual,” CQ Publishing, 2 pages total, 1998, with partial English translation.
Ohkawa Shinji
Uchiyama Kazuhiro
Dickinson Wright PLLC
Panasonic Corporation
Shingleton Michael B
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