Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1994-01-28
1994-11-29
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
With feedback of modulated output signal
455127, 330129, H04B 104, H03G 320
Patent
active
053697898
ABSTRACT:
A power amplifier amplifies a modulated carrier signal having an amplitude modulation component and a phase modulation component to generate a transmission signal. Part of the transmission signal is extracted by a monitor circuit. The detection signal detected by an envelope detector is compared with a burst control signal by a differential amplifier. The resulting error signal is input to a gain control terminal of a power amplifier through a sample and hold circuit, thus forming a feed-back loop. The sample and hold circuit outputs a sample signal during the transmission signal ramping-up and ramping-down periods, thus effectively turning ON the feed-back loop to an ON to control the transmission signal ramping-up and ramping-down. The sample and hold circuit outputs the hold signal during a modulated data transmission period, effectively turning OFF the feedback loop. As a result, a burst transmission output with a stable transmission power level can be obtained.
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"Committee Letter Ballot TR-45.3 Digital Cellular Systems", Telecommunications Industry Association, Sep. 25, 1991, pp. 8-24.
Enoki Takashi
Kosugi Hiroaki
Matsumoto Takayuki
Eisenzopf Reinhard J.
Matsushita Electric - Industrial Co., Ltd.
Vo Nguyen
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