An 11 bit 150 MS/s Sub-range SAR ADC IP for Wireless Transceiver

An 11 bit 150 MS/s dual-channel successive-approximation-register (SAR) analog-to-digital converter (ADC) IP for wireless transceiver is presented in this paper. Each channel adopts sub-range SAR architecture, which combines bootstrap switches for high linearity, gate-controlled ring oscillator (GCRO) for high speed and dynamic comparator for low power. In addition, division in Capacitive Digital-to-analog Converter (CDAC) avoids capacitors connecting to common-mode voltage (VCM) and the switch transistors incompletely switching on. The 11 bit 150 MS/s prototype is fabricated in smic 55 nm low leakage CMOS process. The active area of dual-channel ADC IP is 0.35 mm², while the core area is 0.046 mm². A single channel consumes 2.04 mA current and achieves an SNDR of 60.9 dB at 150 MS/s sample rate and 1.2V supply and reference, resulting in a FOM of 17.9 fJ/Conversion-step. Measured DNL and INL are +0.99/-0.81 LSB and +2.21/-1.37 LSB, respectively.