Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2008-07-01
2008-07-01
Nguyen, Lee (Department: 2618)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S127100, C330S133000, C330S285000
Reexamination Certificate
active
11216061
ABSTRACT:
In a high frequency power amplifier circuit in which bias voltages are applied to the transistors for amplification by current mirroring, The power amplifier includes a detection circuit including a transistor for detection which receives the AC component of an input signal to the last-stage transistor for amplification at its control terminal, a current mirror circuit which mirrors current flowing through that transistor, and a current-voltage converter which converts current flowing in the slave side of the current mirror circuit into a voltage. In the detection circuit, a voltage from a bias circuit for generating the bias voltages for the transistors for amplification is applied to the control terminal of the transistor for detections, and output of the detection circuit is applied to the control terminal of the last-stage transistor for amplification.
REFERENCES:
patent: 6625429 (2003-09-01), Yamashita
patent: 2004/0075501 (2004-04-01), Takahashi et al.
patent: 2000-151310 (2000-05-01), None
patent: 2001-016116 (2001-01-01), None
patent: 2004-140518 (2004-05-01), None
patent: 2004/023469 (2004-03-01), None
Akamine Hitoshi
Koshio Kazuhiro
Takahashi Kyoichi
Tsuchiya Masahiro
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Nguyen Lee
Renesas Technology Corp.
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