Apparatus and method for reduced sample rate class S RF...

Details Apparatus and method for reduced sample rate class S RF... Apparatus and method for reduced sample rate class S RF...

2008-07-01

2008-07-01

Pascal, Robert J. (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C375S238000

Reexamination Certificate

active

11327838

ABSTRACT:
A Class S RF power amplifier for use in a radio frequency (RF) transmitter. The Class S power amplifier comprises a delta-sigma modulator that receives an analog modulated RF carrier and generates a pulse-width modulated binary signal. The Class S power amplifier also comprises a switch mode power amplifier that receives the pulse-width modulated binary signal generated by the delta-sigma modulator and generates an output carrier signal that switches between a fully on state and a fully off state. The sampling rate of the delta-sigma modulator is less than four times the frequency of the output carrier signal generated by the switch mode power amplifier.

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