Amplifiers – Signal feedback – Frequency responsive feedback means
Reexamination Certificate
2008-06-23
2010-06-08
Choe, Henry K (Department: 2817)
Amplifiers
Signal feedback
Frequency responsive feedback means
C330S302000
Reexamination Certificate
active
07733173
ABSTRACT:
A unilateral feedback power amplifier utilizes new feedback techniques and devices to make the amplified high-frequency signal unilateral, let the output power, power gain and impedance matching simultaneously accomplish the optimal values, and enhance the stability of the system. In this feedback amplifier, a generalized multi-port feedback circuit is in shunt with the input terminal and the output terminal of the power transistor. This generalized multi-port feedback circuit receives an amplified high-frequency signal and eliminates the reverse admittance of the amplified high-frequency signal to let the admittance value of the output amplified high-frequency signal approach zero so as to be unilateral. Moreover, the generalized multi-port feedback power amplifier differs from the conventional power amplifier of cascaded architecture in that the ground terminal of the power transistor is directly connected to the system ground. Therefore, the heat-radiating problem of the power transistor can be greatly improved.
REFERENCES:
patent: 4614915 (1986-09-01), Heston et al.
patent: 4771247 (1988-09-01), Jacomb-Hood
patent: 6211738 (2001-04-01), Hecht
patent: 7298205 (2007-11-01), Nakatani et al.
patent: 7355479 (2008-04-01), Van Der Heijden
Gupta, M.; “Power Gain in Feedback Amplifiers, a Classic Revisited”; IEEE Transactions on Microwave Theory and Techniques; vol. 40, No. 5, May 1992; pp. 864-879.
van der Heijden, M., et al.; “On the Design of Unilateral Dual-Loop Feedback Low-Noise Amplifiers with Simultaneous Noise, Impedance, and IIP3 Match”; IEEE Journal of Solid-State Circuits; vol. 39, No. 10, Oct. 2004; pp. 1727-1738.
“Manual of HWF1686RA”; Hexawave, Inc.; Autumn 2002; 3 pages.
Tsai, Z., et al.; “A New Feedback Method for Power Amplifier with Unilateralization and Improved Output Return Loss”; IEEE Transactions on Microwave Theory and Techniques; vol. 54, No. 4, Apr. 2008; pp. 1590-1597.
Tsai Zuo-Min
Vendelin George D.
Wang Huei
Choe Henry K
National Taiwan University
Rosenberg , Klein & Lee
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