Distortion compensating and power amplifying apparatus

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

Reexamination Certificate

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C330S302000

Reexamination Certificate

active

11108666

ABSTRACT:
Disclosed is a distortion compensating and power amplifying apparatus including: a transistor to power amplifies an input signal; a branch circuit to branch the input signal into two signals; distortion compensation means for generating a second harmonic of a fundamental wave for one of branched signals and adding the generated second harmonic to the other branch signal from said branch circuit for input to an input terminal of said transistor; and a termination circuit connected to an output terminal of said transistor and grounding the second harmonic.

REFERENCES:
patent: 3825843 (1974-07-01), Felsberg et al.
patent: 8-14894 (1996-06-01), None
patent: 10-65465 (1998-03-01), None
patent: 2004-32351 (2004-01-01), None
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“New Linearization Method Using Interstage Second Harmonic Enhancement,” D. Jing, et al., IEEE Microwave and Guided Wave Letters, vol. 8, No. 11, Nov. 1998, pp. 402-404.
“A Low Third Order Intermodulation Amplifier with Harmonic Feedback Circuitry,” M. R. Moazzam, et al., IEEE MTT-S Digest, 1996, pp. 827-830.
“An Analysis of Higher-Order of a GaAs FET Depending on IMD Source Impedance and its Application to a Design of Low-Distortion MMIC Power Amplifiers,” S. Kusunoki, et al., Electronics and Communications in Japan, Part 2, vol. 85, No. 4, 2002, Translated from Denshi Joho Tsushin Gakkai Ronbunshi, vol. J83-C, No. 6, Jun. 2000, pp. 542-552.
“Low Intermodulation Amplifiers for RF and microwave Wireless Systems,” N. Males-Ilic, et al., Proceedings of APMC 2001, Taipei, Taiwan, R.O.C., pp. 984-987.

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