A 100 KS/s 8-10-Bit Resolution-Reconfigurable SAR ADC for Biosensor Applications

作者：Hu, Yunfeng^*; Hu, Lexing; Tang, Bin; Li, Bin; Wu, Zhaohui; Liu, Xiaojia

来源：Micromachines, 2022, 13(11): 1909.

DOI：10.3390/mi13111909

• SAR ADC
• resolution-reconfigurable
• switching scheme

A DAC switching scheme that combines energy efficiency and resolution reconfigurability is proposed. Compared with the conventional switching scheme, the proposed scheme achieves 93.8%, 96.1%, and 97.3% switching energy saving in 8-bit, 9-bit, and 10-bit modes, respectively. Based on the proposed switching scheme, an 8-10-bit resolution-reconfigurable SAR ADC for biosensor applications is designed. The ADC consists of resolution-reconfigurable binary-weighted capacitive DAC, a two-stage full dynamic comparator, sampling switch, and the resolution-control SAR logic. Simulated in 180 nm CMOS process and 100 kS/s sampling rate, the ADC achieves the 46.80/53.89/60.14 dB signal-to-noise and distortion ratio (SNDR), the 55.22/62.51/73.09 dB spurious-free dynamic range (SFDR) and the 0.81/0.91/1.01 mu W power consumption in 8/9/10-bit mode, respectively.

• 单位
  电子科技大学