Patent ID: 6861968

Claim:
A digital to analog converter system, comprising: a multi-bit digital to analog converter (“DAC”) to (i) receive a digital input signal having a frequency attenuation band around a frequency f chop , and (ii) convert the DAC input signal into a representative analog signal, the DAC comprising: a modulation circuit having a modulation frequency of f chop to modulate the DAC input signal by f chop ; a gain stage coupled to the modulation circuit to receive signals modulated by the modulation circuit and provide gain for the DAC, wherein during operation the gain stage is associated with noise having frequencies within the baseband; and a demodulation circuit, coupled to the gain stage and having a demodulation frequency equal to approximately or equal to f chop , to demodulate signals by approximately or equal to f chop ; and a notch filter to generate the frequency attenuation band around the frequency f chop to reduce introduction of noise into a frequency baseband of the digital input signal.