A Noise-Shaping SAR ADC with Mismatch Error Shaping and a Passive Gain of 4
This paper presents a high-resolution fully passive NS SAR ADC.First,it uses a second-order mismatch error-feedback error shaping(EFMES),and uses a digital prediction method to recover the signal-range loss caused by the MES.Second,It uses an fully passive noise-shaping architecture that realizes the passive summation and the passive gain of 4,shape the thermal noise and the Quantization Noise inside the system.At last,it uses a differential custom capacitors,The overall area of the capacitor array is reduced while maintaining good linearity.This design uses the SMIC 0.18 process,Post-simulation shows that at the 1.8V power supply voltage and IMS/s sampling rate,the SNDR of ADC is 88.23dB,the SFDR is 93.67dB.The total power consumption is only 965 μ W,and occupies an active area of 1.95mm2.
successive approximationanalog-to-digital convertermismatch error shapingcustom-designed capac-itornoise-shapingdynamic element matching
NETL
NSTL
万方数据
维普
