Telecommunications – Transmitter – Carrier amplitude control
Patent
1993-08-16
1995-06-06
Urban, Edward F.
Telecommunications
Transmitter
Carrier amplitude control
455126, 330129, 330279, H04B 104
Patent
active
054230810
ABSTRACT:
A power level control circuit for the power amplifier of a mobile cellular unit does not require a matched diode pair yet is simple in design. A sampling device, such as a directional coupler or sampling capacitor, connected to an output of the power amplifier provides a sampled RF signal output. An impedance is connected to the sampling device, and the sampling device forms a RF attenuator. A tunnel diode detector is connected to the sampling device for generating a detected d.c. output signal. Power level control (PLC) circuitry compares the detected d.c. output signal from the tunnel diode detector with a selected power level control reference signal and generates a feedback signal to the RF power amplifier to control the power level output from the amplifier. The dynamic range of this basic circuit is increased by switched attenuators, switched parallel detectors with scaled attenuation factors, or a controlled varactor diode used to change the RF coupling to the diode detector.
REFERENCES:
patent: 4476437 (1984-10-01), Fujiwara
patent: 4485349 (1984-11-01), Siegel et al.
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4952866 (1990-08-01), Van Tuijl
patent: 5126686 (1992-06-01), Tam
patent: 5208550 (1993-05-01), Iwane
patent: 5214393 (1993-05-01), Aihara
Karimullah Khalid
Kwok Sai
Thiele Al
Denson-Low Wanda K.
Faile Andrew
Hughes Aircraft Company
Lindeen III Gordon R.
Urban Edward F.
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