Radio frequency (RF) power amplifier and RF power amplifier...

Amplifiers – With semiconductor amplifying device – Including gain control means

Reexamination Certificate

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C330S279000

Reexamination Certificate

active

07876156

ABSTRACT:
An RF power amplifier has a final-stage amplifier stage which generates an RF transmit output signal, a signal detector which detects an RF transmit output level, a first detector, a second detector and a control circuit. The final-stage amplifier stage includes a transistor and a load element and performs saturation type nonlinear amplification and non-saturation type linear amplification. The first detector and the control circuit maintain the RF transmit output signal approximately constant with respect to a variation in load at an antenna at the saturation type nonlinear amplification. The second detector and the control circuit reduce an increase in the output voltage of the final stage transistor with respect to an overload state of the antenna at the non-saturation type linear amplification.

REFERENCES:
patent: 7193471 (2007-03-01), Tsutsui et al.
patent: 2008/0150637 (2008-06-01), Takahashi et al.
McCune, High-Efficiency, Multi-Mode, Multi-Band Terminal Power Amplifiers, IEEE microwave magazine, Mar. 2005, pp. 44-55.
Zhang et al., A Novel Power-Amplifier Module for Quad-Band Wireless Handset Applications, IEEE Transactions on Microwave Theory and Techniques, vol. 51, No. 11, Nov. 2003, pp. 2203-2210.
Hau et al., High Efficiency, Wide Dynamic Range Variable Gain and Power Amplifier MMICs for Wide-Band CDMA Handsets, IEEE Microwave and Wireless Components Letters, vol. 11, No. 1, Jan. 2001, pp. 13-15.
Scuderi et al., A VSWR-Protected Silicon Bipolar RF Power Amplifier With Soft-Slope Power Control, IEEE Journal of Solid-State Circuits, vol. 40, No. 3, Mar. 2005, pp. 611-621.
Ikeda et al., A Low Distortion and High Efficiency Parallel-Operation Power Amplifier Combined in Different Phases in Wide Range of Load Impedances, 1996 IEEE MTT-S Digest, pp. 535-538.
Berretta et al., A Balanced CDMA2000 SiGe HBT Load Insensitive Power Amplifier, 2006 IEEE Radio and Wireless Symposium Jan. 17-19, 2006, pp. 523-526.

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