Mobile communication apparatus and method

Details Mobile communication apparatus and method Mobile communication apparatus and method

1994-09-19

1996-11-12

Pham, Chi H.

Telecommunications

Transmitter

With feedback of modulated output signal

455 69, 455127, H09B 104

Patent

active

055749933

ABSTRACT:
A mobile communication apparatus is provided, in which the linearity during a small output power of a radio-frequency power amplifier can be maintained as during a large output power. The input signal power to a radio-frequency power amplifier is decreased by an attenuator during a small power output. The resulting downward trend of the transmission signal power is compensated for by increasing the gain of the radio-frequency amplifier circuit through a transmission power control circuit. Under this condition, the radio-frequency power amplifier is made operable in a linear region of the transistor in the same manner as during a large power output. As a result, the linearity of the amplifier is guaranteed over the whole operating range of the transmission power.

REFERENCES:
patent: 4999583 (1991-03-01), Washburn et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5307512 (1994-04-01), Mitzlaff
patent: 5321849 (1994-06-01), Lemson
Hitachi Review, (Semiconductor Technology for Mobile Communications), Jun. 1993, vol. 42, No. 3, pp. 95-118. (English).
U.S. application Ser. No. 08/192,301, filed Feb. 4, 1994.

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