Continuous-time /spl Delta//spl Sigma/ modulators using distributed resonators

• Published in: IEEE transactions on circuits and systems. I, Regular papers Vol. 52; no. 11; pp. 2397 - 2403
• Main Authors: Kaplan, T.S., Jensen, J.F.
• Format: Journal Article
• Language: English
• Published: IEEE 01-11-2005
• Subjects: Analog-to-digital conversion; Clocks; continuous-time (CT) systems; Delay; Delta modulation; Dynamic range; Frequency conversion; Impedance; Resonance; Resonant frequency; Sampling methods; sigma-delta modulation; transmission line resonators; Transmission lines
• ISSN: 1549-8328; 1558-0806
• DOI: 10.1109/TCSI.2005.853900

We derive a method for using distributed resonators in /spl Delta//spl Sigma/ modulators and demonstrate these /spl Delta//spl Sigma/ modulators have several advantages over existing /spl Delta//spl Sigma/ modulator architectures. Like continuous-time (CT) /spl Delta//spl Sigma/ modulators, the proposed /spl Delta//spl Sigma/ modulators do not require a high-precision track-and-hold, and additionally can take advantage of the high-Q of distributed resonators. Like discrete-time /spl Delta//spl Sigma/ modulators, the proposed /spl Delta//spl Sigma/ modulators are relatively insensitive to feedback loop delays and can subsample. We present simulations of several types of these /spl Delta//spl Sigma/ modulators and examine the challenges in their design.