A 2.5-bit/cycle 10-bit 160-MS/s SAR ADC in 90-nm CMOS process

This paper presents a single-channel 2.5-bit/cycle successive-approximation register (SAR) analog-to-digital converter (ADC). In comparison with conventional 2.5-bit/cycle SAR ADC, the proposed technique can save one sub-digital-to-analog converter (sub-DAC) and reduce the requirement on resolution for the other sub-DACs. Besides, the proposed digital code error correction provides a wider error tolerance range. The proposed ADC was fabricated in TSMC 90-nm CMOS process. At 1-V supply and 160 MS/s, the measured peak signal-to-noise and distortion ratio (SNDR) is 53.06 dB with power consumption of 1.97 mW.