An analog-to-digital converter (ADC) includes a continuous time filter, a quantizer, a continuous time digital-to-analog converter, a discrete time DAC, and a switch. The quantizer has an input terminal coupled to the output terminal of the continuous time filter, and a plurality of output terminals. The continuous time DAC has a plurality of input terminals coupled to the plurality of output terminals of the quantizer, and an output terminal. The discrete time DAC has a plurality of input terminals coupled to the plurality of output terminals of the quantizer, and an output terminal. The switch has a first input terminal coupled to the output terminal of the continuous time DAC, a second input terminal coupled to the output terminal of the discrete time DAC, and an output terminal coupled to the input terminal of the continuous time filter.