Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1993-03-11
1994-11-08
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330277, 330279, H03G 330
Patent
active
053630580
ABSTRACT:
An amplifier for amplifying a high frequency signal includes an input impedance matching circuit; an output impedance matching circuit; an FET having a gate and a drain connected to the input impedance matching circuit and the output impedance matching circuit, respectively; and a gate voltage control circuit for controlling the gate voltage of the FET in response to the power of the high frequency signal. The gate voltage control circuit includes a diode having an anode connected to the gate, a capacitor connected between the cathode of the diode and ground, and a gate bias setting circuit connected to the junction of the diode and the capacitor. The gate bias setting circuit outputs a control voltage corresponding to the power of the high frequency signal. As a result, impedance matching by the output matching circuit is not disturbed and the linearity of the output power to the input power is maintained so that the amplifier operates highly efficiently.
REFERENCES:
patent: 4268797 (1981-05-01), Buck et al.
patent: 4320352 (1982-03-01), Rubin et al.
Mitsubishi Denki & Kabushiki Kaisha
Mullins James B.
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