Analog-to-digital converter survey and analysis
IEEE Journal on Selected Areas in Communications
A brief introduction to time-to-digital and digital-to-time converters
IEEE Transactions on Circuits and Systems II: Express Briefs
A/D conversion using asynchronous delta-sigma modulation and time-to-digital conversion
IEEE Transactions on Circuits and Systems Part I: Regular Papers - Special section on 2009 IEEE custom integrated circuits conference
Sampled-data IIR filtering via time-mode signal processing
Analog Integrated Circuits and Signal Processing
Linear processing of PWM signals using a RC time encoded integrator
Analog Integrated Circuits and Signal Processing
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In this paper, a signal processing methodology is proposed that performs delta-sigma (ΔΣ) analog-to-digital (A/D) conversion on voltage signals while implementing all the circuits in a digital CMOS logic style. This methodology, called time-mode (TM) signal processing, uses time-difference variables as an intermediate signal between the input voltage and the digital output. The resulting low-cost silicon devices offer very compact, low-power, high-speed, and robust A/D converter (ADC) alternatives. A first-order ΔΣ ADC is implemented using this methodology. Two ICs were fabricated in a 0.18-µm CMOS technology to demonstrate the feasibility of the TM ΔΣ ADC approach. The first IC implements a single-ended input design while a differential design was fabricated in the second IC. Experimental results reveal that these devices can achieve 7-9-bit resolutions within 125-400-kHz bandwidths, while occupying areas smaller than 50 µm × 50 µm and consuming less than 800 µW.