Maximum likelihood estimation-based SAR ADC

Akshay Jayaraj, Sanjeev Tannirkulam Chandrasekaran, Archana Ganesh, Imon Banerjee, Arindam Sanyal

Research output: Contribution to journalArticlepeer-review


A 10-bit successive approximation register (SAR) analog-to-digital converter (ADC) with maximum likelihood estimation (MLE) is presented in this brief. After SAR quantization is finished, the comparator is fired 18 times and the outputs are sent to the estimator for calculation of the residue voltage. The estimator output is subtracted from the SAR output to form the overall output. MLE improves the ADC SNR by more than 8 dB without the need for prior knowledge of SAR noise distribution. A prototype ADC in 65 nm process achieves an average SNR of 64.5 dB at sampling frequency of 1.28 MHz and power supply of 1 V while consuming 5.6 fJ/conversion-step. The estimation accuracy is consistent across voltage and temperature ranges.

Original languageEnglish (US)
Article number8572763
Pages (from-to)1311-1315
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number8
StatePublished - Aug 2019


  • Successive approximation register (SAR)
  • analog-to-digital converter (ADC)
  • maximum likelihood estimation
  • stochastic ADC

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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