Output-controlled power amplifier, radio communication terminal

Details Output-controlled power amplifier, radio communication terminal Output-controlled power amplifier, radio communication terminal

1996-03-27

1998-12-29

Mullen, Jr., Thomas J.

Telecommunications

Transmitter

With feedback of modulated output signal

330129, 330284, H01Q 1112

Patent

active

058549714

ABSTRACT:
In an output-controlled power amplifier of a closed loop type, an input signal is inputted to a main path in which the input signal is power-attenuated by a variable attenuator and power-amplified by a power amplifier. A power divider distributes the amplified input signal between the main path and a feedback path diverging from the main path so that the signal distributed to the main path is outputted from the main path to the exterior while the input signal is controlled on the basis of the signal distributed to the feedback path. The feedback path includes a hold circuit for extracting the signal distributed to the feedback path and holding the value of the power of the extracted signal when the power reaches a predetermined value. A control signal for attenuating the power of the input signal inputted to the main path is generated by the hold circuit and is applied through the feedback path to the variable attenuator on the main path to control the power of the input signal. A transfer function of the closed loop has a Gaussian characteristic.

REFERENCES:
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4803440 (1989-02-01), Hotta et al.
patent: 5196806 (1993-03-01), Ichihara
patent: 5212814 (1993-05-01), Iwane
patent: 5303268 (1994-04-01), Tsutsumi et al.
patent: 5369789 (1994-11-01), Kosugi et al.
patent: 5381115 (1995-01-01), Timmons et al.
patent: 5383223 (1995-01-01), Inokuchi
patent: 5507016 (1996-04-01), Okuhara
Personal Handy Phone System Private Standard/Public Standard of Japan, RCR STD-28, English Version, pp. 1-43, date unknown.
Horowitz et al., The Art of Electronics, First Edition, pp. 246-247, date and publisher unknown.

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