CONTINUOUS TIME SIGMA DELTA MODULATOR

A continuous time sigma delta modulator is disclosed. The modulator includes a loop filter, a multi-stage oscillator-based quantizer, an M-to-N splitter, a digital-to-analog converter (DAC), and a digital error correction filter. The multi-phase oscillator-based quantizer converts an output of the loop filter to an M-bit digital signal, and the splitter splits the M-bit digital signal to N bits and M-N bits. The N bits are sent to the DAC and M-N bits are sent to the digital error correction filter. The multi-phase oscillator-based quantizer includes a ring oscillator and an exclusive OR to capture phase differences of the multi-phase outputs of the ring oscillator. The N bits selected from the M bits may be evenly distributed over the M bits.