A Low-Power Mixed-Architecture ADC with Time-Interleaved Correlated Double Sampling Technique and Power-Efficient Back-End Stages

In this paper, two techniques for implementing a lowpower pipelined analog-to-digital converter (ADC) are proposed. First, the time-interleaved correlated double sampling (CDS) technique is proposed to compensate the finite gain error of operational amplifiers in switchedcapacitor circuits without a half-rate front-end sample-and-hold amplifier (SHA). Therefore, low-gain amplifiers and the SHA-less architecture can be used to effectively reduce power consumption of a pipelined ADC. Second, the back-end pipelined stages of a pipelined ADC are implemented using a low-power time-interleaved successive approximation (SA) ADC rather than operational amplifiers to further reduce the power consumption of the proposed pipelined ADC. A 9-bit, 100-MS/s hybrid pipelined-SA ADC is implemented in the TSMC 0.13 μm triple-well 1P8M CMOS process. The ADC achieves a spurious free dynamic range (SFDR) of 62.15 dB and a signal-to-noise distortion ratio (SNDR) of 50.85-dB for 2-MHz input frequency at a 100-MS/s sampling rate. The power consumption is 21.2 mW from a 1.2 V supply. The core area of the ADC is 1.6 mm2. key words: analog-to-digital converter (ADC), data converter, correlated double sampling (CDS), time-interleaved, successive approximation (SA) ADC