A 10 b 50 MS/s opamp-sharing pipeline A/D with current-reuse OTAs

Kailash Chandrashekar, Bertan Bakkaloglu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


A 10 b opamp-sharing pipeline analog-to-digital (A/D) using current-reuse operational transconductance amplifiers (OTA) with dual nMOS differential inputs is presented. The current-reuse OTA topology facilitates opamp-sharing between all of the consecutive pipeline stages, minimizing power consumption and die area. Analog transistors in the OTA are always biased in saturation ensuring no loss of settling time due to OTA power turn-on delays. The A/D is fabricated in a 0.18-μ m CMOS process and occupies an active die area of 0.7 mm 2. At 50 MS/s, maximum SNDR of 58 dB (ENOB=9.3 b) is achieved with 9.2 mW analog power consumption on a 1.8 V supply.

Original languageEnglish (US)
Article number5518347
Pages (from-to)1610-1616
Number of pages7
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Issue number9
StatePublished - Sep 2011


  • Current-reuse operational transconductance amplifier (OTA)
  • opamp-sharing
  • pipeline analog-to-digital (A/D)

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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