Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2007-09-18
2007-09-18
Lee, Benny (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S133000
Reexamination Certificate
active
11227109
ABSTRACT:
In a high frequency power amplifier circuit in which bias voltages are applied to the transistors for amplification by current mirroring, this invention enables preventing waveform distortion near the peak output power level by allowing sufficient idle currents to flow through the transistors for amplification, while enhancing the power efficiency in a low output power region. The power amplifier includes a detection circuit comprising 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 conversion means 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 detection and output of the detection circuit is applied to the control terminal of the last-stage transistor for amplification.
REFERENCES:
patent: 6919762 (2005-07-01), Akamine et al.
patent: 6943631 (2005-09-01), Scherrer et al.
patent: 2006/0139094 (2006-06-01), Takahashi et al.
patent: 07-154169 (1995-06-01), None
patent: 2000-151310 (2000-05-01), None
patent: 2003-017954 (2003-01-01), None
Akamine Hitoshi
Koshio Kazuhiro
Takahashi Kyoichi
Tsuchiya Masahiro
Lee Benny
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Renesas Technology Corporation
Wong Alan
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