Apparatus for applying different transfer functions to code segments of multi-bit output code that are sequentially determined and output by multi-bit quantizer and associated delta-sigma modulator

A delta-sigma modulator comprising:

• a feed-forward circuit, comprising:
• an integrator circuit, arranged to generate a first analog output according to a first analog input;
• and
• a multi-bit quantizer, arranged to quantize a second analog input to generate a multi-bit output code, wherein the second analog input is derived from the first analog output, and the multi-bit output code comprises a plurality of code segments sequentially determined by the multi-bit quantizer;
• and
• a feedback circuit, comprising:
• a processing circuit, arranged to receive the code segments from the multi-bit quantizer sequentially, and further arranged to generate a plurality of digital outputs according to the code segments, respectively;
• a digital-to-analog conversion circuit, arranged to receive the digital outputs from the processing circuit, and convert the digital outputs into second analog outputs, respectively;
• and
• a combining circuit, arranged to generate and output a third analog output to the feed-forward circuit by combining the second analog outputs of the digital-to-analog conversion circuit;
• wherein the code segments comprise a first code segment and a second code segment, the digital outputs comprise a first digital output derived from the first code segment and a second digital output derived from the second code segment, and a first transfer function between the first digital output and the first code segment is different from a second transfer function between the second digital output and the second code segment.