Modulators – Phase shift keying modulator or quadrature amplitude modulator
Reexamination Certificate
2011-03-08
2011-03-08
Mis, David (Department: 2817)
Modulators
Phase shift keying modulator or quadrature amplitude modulator
C332S105000
Reexamination Certificate
active
07902937
ABSTRACT:
A differential positive coefficient weighted quadrature modulator is actuated responsive to quadrature clock signals and positive digital modulation signals input to the modulator. The modulator includes an I-channel positive coefficient weighted modulator (PCWM) and a Q-channel PCWM. The I-channel PCWM has differential output nodes configured to output a differential I-channel signal responsive to the state of first and second positive digital modulation signals and first and second complimentary quadrature clock signals input to the I-channel PCWM. The Q-channel PCWM has differential output nodes configured to output a differential Q-channel signal responsive to the state of third and fourth positive digital modulation signals and third and fourth complimentary quadrature clock signals input to the Q-channel PCWM. The positive digital modulation signals input to the I-channel and Q-channel PCWMs have positive amplitude and the I-channel and Q-channel PCWMs conduct at approximately half clock cycle or less of the corresponding quadrature clock signals.
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Coats & Bennett P.L.L.C.
Mis David
Telefonaktiebolaget LM Ericsson (publ)
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