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Multibit CT SD modulators with pulse width modulation and FIR-DAC in the feedback path

A new class of multibit Continuous-Time Sigma-Delta Modulators (CT-SDMpsilas) is presented in this paper. The multibit stream in the quantizer output is converted to a single-bit Pulse Width (PW) modulated signal and fed back to the modulator input through a Finite Impulse Response (FIR) Digital-to-Analog Converter (DAC). The resulting architecture does not require Dynamic Element Matching (DEM) and it is very robust against clock jitter.