Fat tree encoder design for ultra-high speed flash A/D converters

Daegyu Lee, Jincheol Yoo, Kyusun Choi, Jahan Ghaznavi

Research output: Contribution to journalArticlepeer-review

87 Scopus citations


The thermometer code-to-binary code encoder has become the bottleneck of ultra-high speed flash ADCs. In this paper, the authors present the fat tree thermometer code-to-binary code encoder that is highly suitable for ultra-high speed flash ADCs. The simulation and the implementation results show that the fat tree encoder outperforms the commonly used ROM encoder in terms of speed and power for the 6 bit CMOS flash ADC case. The speed is improved by almost a factor of 2 when using the fat tree encoder, which in fact demonstrates the fat tree encoder is an effective solution for the bottleneck problem in ultra-high speed ADCs.

Original languageEnglish (US)
Pages (from-to)II87-II90
JournalMidwest Symposium on Circuits and Systems
StatePublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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