Suppressed carrier quadrature pulse modulator
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United States of America Patent
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Jan 19, 2010
Grant Date -
Jan 4, 2007
app pub date -
Jun 20, 2005
filing date -
Jun 20, 2005
priority date (Note) -
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Abstract
A digital amplifier and method are provided to convert digital base-band signals to a pair of digital switching waveforms switching at a carrier frequency to create a modulated RF signal. The digital amplifier contains variable frequency suppressed carrier PWM generators that produce in-phase and quadrature-phase differential signals, a mixer that combines the differential signals, a decoder that decodes the combined signals, and a power stage that receives signals from the decoder and provides an amplified signal at the carrier frequency using switches. The mixer combines the differential signals such that only one of the differential signals is output in a period. The carrier generators have integral noise shaping and use a random period signal to re-distribute quantization noise to a band outside an RF band of interest and reduce EMI of the RF signal.
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