Patent ID: 7902937
Filing Date: 2011-03-08
Classification: H03D

Abstract:
1. A differential quadrature modulator comprising: an I-channel positive coefficient weighted modulator having 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 positive coefficient weighted modulator; and a Q-channel positive coefficient weighted modulator having 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 positive coefficient weighted modulator; and wherein the positive digital modulation signals have positive amplitude and the I-channel and Q-channel positive coefficient weighted modulators conduct at approximately half clock cycle or less of the corresponding quadrature clock signals.