A CMOS Transistor-Only 8-b 4.5-Ms/s Pipelined Analog-to-Digital Converter Using Fully-Differential Current-Mode Circuit Techniques

Chung-Yu Wu, Chih Cheng Chen

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Fully-differential current-mode circuit techniques are developed for the design of a pipelined current-mode analog-to-digital converter (IADC) in the standard CMOS digital processes. In the proposed IADC, the 1-b-per-stage architecture based on the reference nonrestoring algorithm is adopted. Thus large component ratios can be avoided and the linearity errors caused by device mismatches can be minimized. As one of the key subcircuits in the IADC, an offset-canceled high speed differential current comparator (CCMP) is proposed and analyzed. In the CCMP, the subtractions of offsets are performed in the current domain without floating capacitors. Moreover, the other key subcircuit, the current sample-and-hold amplifier (CSHA), is also developed to realize the pipeline architecture. An experimental chip for the proposed IADC has been fabricated in 0.8-µm n-well CMOS technology. Using a single 5-V power supply, the fabricated IADC can be operated at 4.5-Ms/s conversion rate with a signal-to-noise-and-distortion-ratio (SNDR) of 51 dB (effective 8.2-b) for the input signal at 453 kHz. For 8-b resolution, the fabricated IADC can be operated at 4.5-Ms/s conversion rate with both differentia] nonlinearity (DNL) and integral nonlinearity (INL) below +/– 0.6 LSB. The power consumption and the active chip area are 16 mW/b and 0.73 mm2/b, respectively.

Original languageEnglish
Pages (from-to)522-532
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume30
Issue number5
DOIs
StatePublished - 1 Jan 1995

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