A 1mW Multi-channel 12-bit SAR A/D Converter

摘要

Design and realization of an 8-channel 12bit SAR A/D converter (ADC) is described in this paper. Based on the successive approximation register (SAR) architecture, this A/D Converter has a maximum sample rate of 140KSPS and the entire ADC consumes only 1mW from a 1.8V supply and the shutdown current is only 1uA. The low-power ADC was fabricated by a 0.18 μm 2P4M CMOS process. The layout area of the ADC is 0.3 mm × 0.35 mm. At the high performance point (12-bit, 140KSPS), the INL and DNL of the ADC are 0.7LSB and 0.66LSB, respectively.