Pre-distorting linearization circuit

Amplifiers – Hum or noise or distortion bucking introduced into signal...

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330295, 330277, H03F 132, H03F 316

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055680879

ABSTRACT:
The invention concerns a pre-distorting linearization circuit, comprising a splitter circuit with an input forming the input of the linearization circuit and first and second outputs feeding first and second parallel stages respectively, of which at least one has a defined distortion characteristic, and a combining circuit receiving the signals provided by the first and second stages at first and second inputs respectively and having a recombination output. According to the invention, the first and second stages have first and second transistors respectively having different dimensions, which confer different non-linearity characteristics thereon, such that for the same voltage on the input of the linearization circuit, the first stage exhibits a higher degree of non-linearity than the second stage.

REFERENCES:
patent: 4564816 (1986-01-01), Kumar et al.
patent: 5291148 (1994-03-01), Reisner et al.
M. Kumar et al., "GaAs Dual-Gate FET Linearizer for Traveling-Wave Tube Amplifiers", Microwave Journal, vol. 27, No. 8, Aug. 1984, pp. 127-134.
N. Imai, "A 10 GHz MMIC Predistortion Linearizer Fabricated on a Single Chip", Transactions of the Institute of Electronics and Communication, vol. E76-C, No. 12, Dec. 1993, pp. 1847-1850.

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