Radio transmitters

Details Radio transmitters Radio transmitters

1988-04-25

1989-12-26

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

455 63, 455115, H04L 2549

Patent

active

048903000

ABSTRACT:
A radio transmitter includes a bank of pre-distortion circuits each of which is selectively connectable between the mixing stages of the transmitter and the final linear power amplifier stage of the transmitter. The pre-distortion circuit to be connected is determined by the RF frequency of the signal to be transmitted. A method of analyzing the distortion produced by a linear power amplifier is also described. In this method two tones are applied to the amplifier and the resulting down-mixed signal is subjected to a FET in order to derive the spectrum and plot the amplitude and phase distortion against the two tone amplitude. Analysis of the results of such testing allows the pre-distortion circuits to be designed to compensate for distortion produced by the amplifier over the complete operating frequency range of the transmitter.

REFERENCES:
patent: 4025855 (1977-05-01), Atkinson
patent: 4165493 (1979-08-01), Harrington
patent: 4238855 (1980-12-01), Zborowski
patent: 4422047 (1983-12-01), Wright
patent: 4491973 (1985-01-01), Idol
Comsat Technical Review, vol. 15, No. 2, Part A, 1985, pp. 309 to 341, Washington U.S. "Linearised Transponder Technology for Satellite Communications, Part II: System Simulation and Performance Assessment": Y. S. Lee et al.

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