Amplification systems

Details Amplification systems Amplification systems

1992-06-29

1993-11-16

Mullins, James B.

Amplifiers

With pilot frequency control means

330149, H03F 132

Patent

active

052627349

ABSTRACT:
An amplification system for amplifying an input signal at radio frequency comprises a linear power amplifier and a drive unit. In a test mode, the drive unit feeds two signal tones simultaneously to the amplifier input and a processing circuit analyse the output of the amplifier to identify distorting IMPs. A predistortion circuit operates in an amplification mode to apply a predistortion to a digital representation of the input signal to compensate for the effect of the distorting IMPs generated in the amplifier.

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
patent: 4561111 (1984-08-01), Conner
International Technology Disclosures ITD 79016, vol. 8, No. 7, Jul. 25, 1990.
COMSAT Technical Review, vol. 15, No. 2, Part A, 1985, pp. 309 to 341, Washington US "Linearised transponder technology for satellite communications, Part II: System simulation and performance assessment:" Y. S. Lee et al.

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