Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2005-07-19
2005-07-19
Nguyen, Patricia (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S127000
Reexamination Certificate
active
06919762
ABSTRACT:
The present invention provides a high frequency power amplifier of a multi-stage configuration in which a plurality of transistors for power amplification are cascaded, with reduced distortion of a signal in a region where an output power level is low and improved power efficiency. In a high frequency power amplifier electric part in which a plurality of transistors for power amplification are cascaded, a transistor for output level detection is provided whose gate terminal receives a gate input of a transistor for power amplification in the final stage via a resistive element of which resistance value is 100 Ω or less. Current detected by the transistor is converted to voltage. The voltage is compared with output control voltage by an error amplifier. Voltage according to the potential difference is applied to the gate terminals of the transistors for power amplification in the amplification stages to thereby pass idle current.
REFERENCES:
patent: 5442322 (1995-08-01), Kornfeld et al.
patent: 5942946 (1999-08-01), Su et al.
patent: 6265943 (2001-07-01), Dening et al.
patent: 6463267 (2002-10-01), Akamine et al.
patent: 6753735 (2004-06-01), Arai et al.
patent: 6822511 (2004-11-01), Doherty et al.
patent: 2002/0146993 (2002-10-01), Persico et al.
patent: 2001-7657 (2001-01-01), None
Akamine Hitoshi
Takahashi Kyoichi
Tsuchiya Masahiro
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Nguyen Patricia
Renesas Technology Corp.
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