Cryogenic analog-to-digital converters using spread spectrum technology for coherent receivers

Yu Shao Jerry Shiao*, Tzihong Chiueh, Shu-I Hu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We propose analog-to-digital converters (ADCs) using spread spectrum technology in cryogenic receivers or at warm room temperature for coherent receiver backend systems. As receiver signals are processed and stored digitally, ADCs play a critical role in backend read-out systems. To minimize signal distortion, the down-converted signals should be digitized without further transportation. However, digitizing the signals in or near receivers may cause radio frequency interference. We suggest that spread spectrum technology can reduce the interference significantly. Moreover, cryogenic ADCs at regulated temperature in receiver dewars may also increase the bandwidth usage and simplify the backend digital signal process with fewer temperature-dependant components. While industrial semiconductor technology continuously reduces transistor power consumption, low power high speed cryogenic ADCs may become a better solution for coherent receivers. To examine the performance of cooled ADCs, first, we design 4 bit 65 nm and 40 nm CMOS ADCs specifically at 10 K temperature, which commonly is the second stage temperature in dewars. While the development of 65 nm and 40 nm CMOS ADCs are still on-going, we estimate the ENOB is 2.4 at 10 GSPS, corresponding to the correlation efficiency, 0.87. The power consumption is less than 20 mW.

Original languageEnglish
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
DOIs
StatePublished - 1 Dec 2012
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI - Amsterdam, Netherlands
Duration: 3 Jul 20126 Jul 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8452
ISSN (Print)0277-786X

Conference

ConferenceMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
CountryNetherlands
CityAmsterdam
Period3/07/126/07/12

Keywords

  • Analog-to-digital converter
  • Coherent receiver
  • Digitizer
  • Spread spectrum

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