Amplifiers – Modulator-demodulator-type amplifier
Patent
1998-12-23
2000-04-11
Pascal, Robert
Amplifiers
Modulator-demodulator-type amplifier
330207A, 375238, H03F 338
Patent
active
060492481
ABSTRACT:
A circuit for receiving an input signal having a phase component and an amplitude component which carry information, and for producing an output driver signal containing the phase and amplitude component information for driving a non-linear amplifier for generating linear amplification. The circuit includes a voltage controlled oscillator for receiving the phase component and for outputting a phase modulated carrier signal having a duty cycle and a constant amplitude. A driver stage made from a plurality of invertors, each having a pair of MOSFET transistors, receives the carrier signal at the gate terminals of the transistors. The amplitude component is used to drive the invertors by applying the amplitude component to the backgate terminals of at least some of the transistors in the invertors to pulse width modulate the carrier signal. The resulting output signal containing both phase component information and amplitude component information can then be used to drive a non-linear Class S amplifier to generate linear amplification while achieving high efficiency.
REFERENCES:
patent: 3896395 (1975-07-01), Cox
patent: 4004246 (1977-01-01), Hamada
patent: 5535438 (1996-07-01), Sevic
patent: 5847602 (1998-12-01), Su
Glas Jack
Wang Hongmo
Choe Henry
Lucent Technologies - Inc.
Pascal Robert
LandOfFree
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