Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1997-10-06
2000-07-04
Shingleton, Michael B
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330 10, 330207A, 330251, 330297, H03G 330
Patent
active
06084468&
ABSTRACT:
A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an adaptive split band modulator (270), and a power amplifier (260). The adaptive split band modulator (270) amplifies the low frequency components using a class S modulator (760), and amplifies the high frequency components using a class B amplifier (750). The power supply of the class B amplifier (750) is adaptively modified as a function of the amplitude of the signal that it amplifies. In this manner, the class B amplifier (750) operates at a higher efficiency.
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Clark, II James Roger
Raab Frederick H.
Sigmon Bernard Eugene
LeMoine Dana B.
Lorenz Timothy J.
Motorola Inc.
Shingleton Michael B
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