0.6-1.2 V, 0.22 pJ/bit True Random Number Generator Based on SAR ADC

Akshay Jayaraj, Nimish Nitin Gujarathi, Illakiya Venkatesh, Arindam Sanyal

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


This brief proposes a true-random number generator (TRNG) based on a successive approximation register (SAR) analog-To-digital converter (ADC). After the SAR ADC has finished conversion, the comparator is fired again to quantize the residue. The 1-bit quantized residue acts as a true random sequence and no additional circuits are required for the TRNG. A prototype fabricated in 65nm process acts as a TRNG over 0.6V-1.2V power supply and-5°C to 50°C temperature range without any calibration or post-processing. The TRNG outputs a random sequence at 1.25Mbps and consumes state-of-The-Art energy of 0.22pJ/bit.

Original languageEnglish (US)
Article number8884108
Pages (from-to)1765-1769
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number10
StatePublished - Oct 2020
Externally publishedYes


  • True-random number generator
  • analog-To-digital converter
  • entropy
  • successive approximation register

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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