Series-connected delta-sigma modulator

A series-connected delta-sigma modulator (DSM), comprising:

• a first DSM, configured to receive an input signal, comprising:
• a first loop filter, configured to generate a first processed signal;
• and
• a first quantizer, coupled to the first loop filter, configured to generate a first quantized signal according to the first processed signal, and to feed back the first quantized signal to the first loop filter;
• wherein the first loop filter generates the first processed signal according to the input signal and the first quantized signal fed back to the first loop filter, and the first quantized signal comprises a clipping error smaller than a first predetermined value;
• and
• a second DSM, coupled to the first DSM, configured to receive the first quantized signal from the first DSM, comprising:
• a second loop filter, configured to generate a second processed signal;
• and
• a second quantizer, coupled to the second loop filter, configured to generate a second quantized signal according to the second processed signal, and to feedback the second quantized signal to the second loop filter;
• wherein the second loop filter generates the second processed signal according to the first quantized signal and the second quantized signal fed back to the second loop filter, and the second quantized signal comprises a quantization error smaller than a second predetermined value.