Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-01-03
2006-01-03
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S300000, C332S103000, C332S155000, C455S108000
Reexamination Certificate
active
06983024
ABSTRACT:
A quadra-polar modulator that is simple to implement and also provides good noise performance. The quadra-polar modulator includes four amplitude modulators and a combiner. Each amplitude modulator modulates a respective carrier signal with a respective input signal to provide a respective output signal. The combiner then combines the four output signals from the four amplitude modulators to provide a modulated signal. Each amplitude modulator may be implemented with a switching amplifier, such as a supply modulated class E amplifier. Two input signals are obtained by summing separately an inphase (I) modulating signal and an inverted I modulating signal with an offset value. The other two input signals are obtained by summing separately a quadrature (Q) modulating signal and an inverted Q modulating signal with the offset value. The offset value can be selected based on the expected magnitude of the modulating signals. The four carrier signals are in quadrature to each other.
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C.J. Wei, et al.,Analysis and Experimental Waveform Study TUIF-33 of Inverse Class Class-F Mode of Microwave Power Fets; 2000 IEEE MTT-S Digest: pp. 525-528.
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Brown Charles D
Ha Dac V.
Pappas George C
Qualcomm Inc.
Wadsworth Philip R
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