To solve the problem that the traditional Mash structure has low signal-to-noise ratio because of mismatch at each levels

in this paper

the traditional sigma-delta (

-) structure is realized by using the phase accumulator

which is easy to realize the hardware description language of the whole system

thus fundamentally solving the mismatch between the different stages.In the design of the interpolation filter

the use of optimized half-band filter structure and cascaded integral comb filter

saving hardware resources.The circuit uses the Magnachip 180nm 1P4M standard CMOS process

the chip area is only 0.2025mm

2

(0.450.45)

the measured chip signal to Noise and Distortion Ratio(SNDR) to 90dB.