Band Limited AM modulator using linear power amplification
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United States of America Patent
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Aug 25, 1998
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app pub date -
Apr 8, 1997
filing date -
Apr 8, 1997
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Abstract
A band limited Amplitude Shift Keyed (ASK) modulator employing linear modulation and an efficient Class C power amplifier. Band-limited operation is provided by filtering a digital baseband input signal prior to modulation. Closed loop feedback is employed around the amplifier to assure linear modulation over a wide modulation range which preserves the frequency characteristics of the baseband signal on the modulation envelope. Further filtering is accomplished by exploiting the closed loop system response, incorporating it in the filter characteristic as an added filter pole.
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