Radio frequency PWM & PPM modulator
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United States of America Patent
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Mar 1, 2011
Grant Date -
Sep 16, 2010
app pub date -
Mar 26, 2007
filing date -
Mar 27, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates in general to transferring the envelope information of a polar modulated signal to a varying pulsewidth signal, while the phase modulation is direct transferred to the phase modulation of this PWM signal. Accordingly, the resultant signal is a PWM-PPM-signal. Such a signal can efficiently amplified by use of switching amplifying stages. By the present invention four pre-distorted baseband signals are applied basically to 4 linear RF mixers and a two adders, which are, the only needed external RF building blocks to build the modulator according to the invention. That is, the basic idea of the invention resides in the way of modulation of the four baseband signals and the way of combining of the RF modulated signals.
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