Conventional passive noise shaping SAR ADCs have poor noise-shaping ability because of the gain and phase error of passive switching capacitor integrator. On the basis of passive noise shaping, an active and passive noise shaping SAR ADC was designed in this paper, which integrated low gain OTA and positive feedback circuit, and only a small amount of power consumption was increased, while the gain and phase errors of passive noise shaping module were nearly eliminated. The results showed that the bandwidth of the noise-shaped 10-bit SAR ADC was 10 kHz, the sampling rate was 320 kHz, the power consumption was only 109 μW, and the effective number of bit (ENOB) was 156 bit. The ENOB were more than 15 bit at -40 ℃~85 ℃ and different process corners.