Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Reexamination Certificate
2011-04-26
2011-04-26
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
C330S285000
Reexamination Certificate
active
07932782
ABSTRACT:
A biasing circuit is used to provide low distortion and high efficiency operation of a microwave power amplifier. The biasing circuit utilizes the nonlinear rectified current of a microwave diode or transistor for biasing the amplifying transistor self-adaptively. The biasing current not only reduces the DC bias power during low-power operation and increases self-adaptively during high-power operation, but also manipulates the intermodulation distortion minimum dynamically. Meanwhile, the biasing circuit distorts the input signals with positive gain and negative phase deviations. Therefore, the average power efficiency of the operation is enhanced, the linearity of the input-output characteristic is improved and the radiated level of adjacent channel power is suppressed.
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Chan Chi Hou
Chan Wing Shing
Lau Kwok Wai
Xue Quan
City University of Hong Kong
Hesin Rothenberg Farley & Mesiti P.C.
Nguyen Khiem D
Pascal Robert
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