Low distortion amplifier

Details Low distortion amplifier Low distortion amplifier

1995-09-26

1996-12-31

Mottola, Steven

Amplifiers

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

330110, H03F 126

Patent

active

055897975

ABSTRACT:
Disclosed is a low distortion amplifier circuit of the predistortion type that employs a cuber circuit in the predistortion path to provide optimized signal energy at third order intermodulation frequencies, which cancels IMD products generated by the main power amplifier. The cuber circuit employs a pair of anti-parallel diodes that are biased with at least one D.C. source to produce a D.C. current flow through each diode. The input signal applied to the cuber circuit produces signal current flow in each diode to enable a third order output current to be extracted. A desired amount of third order power is thereby provided to realize minimal IMD power in the main amplifier output over a wide dynamic range of the input signal. Using a circuit analysis based on a power series approach, circuit parameters of the cuber circuit can be optimized to provide a desired amount of cancellation of third order IMD products in the main amplifier, without generating excessive higher order power, over an optimized dynamic range of the input signal.

REFERENCES:
patent: 4157508 (1979-06-01), Hecken
patent: 4513250 (1985-04-01), Harman
patent: 4943783 (1990-07-01), Nojima
T. Nojima and T. Konno, "Cuber Predistortion Linearizer for Relay Equipment in 800 MHz Band Land Mobile Telehone System", IEEE Transactions on Vehicular Technology, vol. VT-34, No. 4, Nov., 1985, pp. 169-177.
M. Abramowitz and I. A. Stegun, Eds., "Handbook of Mathematical Functions", National Bureau of Standards, Applied Mathematics Series #55, 3rd Printing, Mar. 1965, p. 16, Eq. (3.6.25).
R. J. Westcott, "Investigation of multiple f.m./f.d.m. carriers through a satellite t.w.t. operating near to saturation", IEE. vol. 114, No. 6, Jun. 1967, pp. 726-740.

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