Modulation means for an RF power amplifier

Details Modulation means for an RF power amplifier Modulation means for an RF power amplifier

1991-12-03

1993-03-16

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330279, 375 60, 375 68, 455126, 455127, H03G 320

Patent

active

051948230

ABSTRACT:
Modulation device for an RF power amplifier. A correction of the modulation pulse is defined from the non-linear control characteristic of the RF power amplifier (2) such that the influence on the desired output pulse shape caused by the non-linear control characteristic is first compensated for without involvement of a controller. When, due to disturbances acting on the amplifier, changes of the control characteristics or of the RF gain and, consequently deviations in the pulse shape and power occur, then the controller corrects these deviations during the pulse transmission. The modulation device is used in RF transistor power amplifiers having a pulse modulation input.

REFERENCES:
patent: 4592073 (1986-05-01), Watanabe
patent: 4706262 (1987-11-01), Ohta
"Problems with Amplitude Modulation of Transistorized Power Stages", J. Stammelbach, Standard Elektrik Lorenz AG, Stuttgart, West Germany, Jun. 1976, vol. 30, No. 6, pp. 136-144.
"Solid State Amplifiers for DME Beacons", by D. Graziani, Face-Standard, Milan, Italy, Electrical Communication, vol. 50, No. 4, 1973, pp. 273-277.

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