A 0.45-0.7 v 1-6 Gb/s 0.29-0.58 pJ/b Source-Synchronous Transceiver Using Near-Threshold Operation

Woo Seok Choi, Guanghua Shu, Mrunmay Talegaonkar, Yubo Liu, Da Wei, Luca Benini, Pavan Kumar Hanumolu

Research output: Contribution to journalArticle


A low-power source-synchronous multi-Gb/s transceiver is presented. Supply voltage is aggressively scaled to reduce power, and the speed penalty resulting from low-voltage operation is overcome by multiplexing transmitter/receiver synchronized by low-rate multi-phase clocks. Phase spacing errors incurred by device mismatches are corrected using a self-calibration scheme. The proposed phase calibration method uses a single digital DLL to calibrate all the phases, which makes it insensitive to offsets in the calibrating DLL. Fabricated in a 65-nm CMOS process, energy efficiency and data rate of the prototype transceiver vary from 0.29 to 0.58 pJ/bit and 1 to 6 Gb/s, respectively, as the supply voltage changes from 0.45 to 0.7 V.

Original languageEnglish (US)
Pages (from-to)884-895
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Issue number3
StatePublished - Mar 2018



  • Low-power I/O
  • multi-phase calibration
  • near-threshold-voltage circuit design
  • near-threshold-voltage phase-locked loop (PLL)
  • source-synchronous transceiver

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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