Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1993-12-28
1995-06-06
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330279, 330285, 455116, 455127, H03G 330
Patent
active
054225981
ABSTRACT:
A two-stage power amplifier device for use in a digital hand-held radiophone includes a first and a second amplifier circuit. The first amplifier is an exciter-stage amplifier for receiving a high-frequency input signal corresponding to a modulation signal to generate an amplified signal at its output. The second amplifier is a final-stage amplifier connected to either the input signal or the output of the exciter amplifier. A detector circuit is connected to the exciter amplifier, for monitoring variations in a bias current to be fed to the exciter amplifier, and for generating a detection signal indicative of the current variation thus detected. A linearizer circuit is connected to the detector and the final-stage amplifier. The linearizer is responsive to the detection signal, for forcing a bias voltage given to the final-stage amplifier to vary in potential while causing the bias voltage to remain in a univocally determinable relationship with a waveform of said input signal, to thereby increase the linearity of the final-stage amplifier.
REFERENCES:
patent: 3644832 (1972-03-01), Sherman, Jr.
patent: 4458213 (1984-07-01), Quan
Iino Koji
Maeda Tadahiko
Obayashi Shuichi
Sekine Syuuichi
Kabushiki Kaisha Toshiba
Mullins James B.
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