Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2007-09-25
2007-09-25
Choe, Henry (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S129000
Reexamination Certificate
active
10518238
ABSTRACT:
In the present invention, pre-distortion of drive signal and generation of bias signal to a power amplifier are both controlled dependent on an instantaneous size of the input signal, for producing a predetermined gain characteristics. Preferably, the bias signal is kept low in amplitude ranges having a high probability to occur, thus giving a high efficiency, and is allowed to increase towards higher amplitudes, preferably all the way to the maximum amplitude. The pre-distorted drive signal is preferably higher than the input signal in the high-efficiency ranges. Preferably, the drive signal is predominantly composed of low-order components. In cases where signal paths of bias signal and drive signal differs significantly, inverse filtering is applied to ensure the simultaneousness at the input of the amplitude element.
REFERENCES:
patent: 5757229 (1998-05-01), Mitzlaff
patent: 5808511 (1998-09-01), Kobayashi
patent: 5923215 (1999-07-01), Hans
patent: 6028477 (2000-02-01), Gentzler
patent: 6130579 (2000-10-01), Iyer et al.
patent: 6445247 (2002-09-01), Walker
patent: 6531917 (2003-03-01), Yamamoto et al.
patent: 6600369 (2003-07-01), Mitzlaff
patent: 1075081 (2001-02-01), None
S.C. Cripps; “Conventional High-Efficiency Amplifier Modes;” RF Power Amplifiers for Wireless Communications; Artech House; Boston; 1999; pp. 45-60.
Lawrence J. Kushner; “Output Performance of Idealized Microwave Power Amplifiers;” Microwave Journal; Oct. 1989; pp. 103-116.
K.-J. Youn, et al.; “Low Dissipation Power and High Linearity PCS Power Amplifier with Adaptive Gate Bias Control Circuit;” Electronics Letters; Aug. 15, 1996; vol. 32, No. 17; pp. 1533-1535.
T. Iwai et al.; “42% High-Efficiency Two-Stage HBT Power-Amplifier MMIC for W-CDMA Cellular Phone System;” IEEE Transactions MTT; vol. 48, No. 12, Dec. 2000; pp. 2567-2572.
A. Saleh and D. Cox; “Improving the Power-Added Efficiency of FET Amplifiers Operating with Varying-Envelope Signals;” IEEE Trans. MTT; vol. 31, No. 1; Jan. 1983; pp. 51-56.
T. H. Miers and V. A. Hirsch; “A Thorough Investigation of Dynamic Bias on Linear GaAs FET Power Amplifier Performance;” 1992 IEEE MTT-S Digest; pp. 537-540.
D. R. Conn and R. H. Hemmers; “Increased Efficiency in QAM Power Amplifiers;” 1998 IEEE MTT-S Digest; pp. 1647-1650.
I. K. Stubbs; “A Dynamic Efficient Bias Scheme Improves SSPA Performance in Aeronautical Satellite Communication Systems;” IEEE Colloquium on ‘Evolving Technologies for Small Earth Station Hardware;’ Digest No. 1995/037; IEEE, London, UK; 44 pp. 5/1-5/8.
Jean-Serge Cardinal and Fadhel M. Ghannouchi; “A New Adaptive Double Envelope Feedback (ADEF) Linearizer for Solid State Power Amplifiers;” IEEE Trans. MTT; vol. 43, No. 7; Jul. 1995; pp. 1508-1515.
Choe Henry
Telefonaktiebolaget LM Ericsson (publ)
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