Signal processing systems described herein include an analog-to-digital delta
sigma modulator to process a single-ended input signal using a single-ended analog
feedback reference signal. The delta sigma modulator includes a switched capacitor
circuit that integrates a difference between the single-ended input signal and
the single-ended analog feedback signal derived from a quantization output of the
delta sigma modulator. Embodiments of the switched capacitor circuit allow the
delta sigma modulator to be implemented with fewer switches, less complicated reference
signal generators, and smaller capacitors relative to conventional counterparts.
Thus, embodiments of the delta sigma modulator described herein can cost less to
build and use less power. Embodiments of the signal processing systems can be implemented
in single and multi-bit delta sigma modulators and various sampling topologies,
including single and double sampling topologies.