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

Jin-Fu LIN
Soon-Jyh CHANG

Publication
IEICE TRANSACTIONS on Electronics   Vol.E94-C    No.1    pp.89-101
Publication Date: 2011/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.89
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
analog-to-digital converter (ADC),  data converter,  correlated double sampling (CDS),  time-interleaved,  successive approximation (SA) ADC,  

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Summary: 
In this paper, two techniques for implementing a low-power 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 switched-capacitor 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.