The analog-to-digital converter(ADC)is one of the important modules in integrated circuits.MATLAB and Cadence Virtuoso tools were used to comprehensively design the area,power consumption,and accuracy of the ADC converter.Here the GSMC 130 nm CMOS process was used to design a Sigma-Delta modulator for temperature sensors.To improve the accuracy of the modulator,a fully differential operational amplifier circuits of the FLASH ADC was adopted as multi-bit quantization and the DEM calibration technique to reduce the capacitive mismatch effect.The structure of the modulator used the third-order four-bit quantization with signal bandwidth of 2 kHz and sampling frequency of 256 kHz.The simulation results show that the overall power consumption of the modulator is 2.8 mW at the supply voltage of 3.3 V.The area of the core circuit layout is 0.23 mm2,and the effective number of bits(ENOB)can reach up to 16.84 bit.
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