Wide-range 5.0/3.3/1.8-V I/O buffer using 0.35-µm 3.3-V CMOS technology

  • Authors:
  • Tzung-Je Lee;Tieh-Yen Chang;Chua-Chin Wang

  • Affiliations:
  • Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;Himax Technologies, Inc., Hsinchu, Taiwan;Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan

  • Venue:
  • IEEE Transactions on Circuits and Systems Part I: Regular Papers
  • Year:
  • 2009

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Abstract

A 5.0/3.3/1.8-V tolerant I/O buffer implemented using typical CMOS 2P4M 0.35-µm process is proposed in this paper. Unlike traditional mixed-voltage-tolerant I/O buffers, the proposed I/O buffer can transmit and receive signals with voltage levels of 5.0/3.3/1.8 V. By using a stacked PMOS and a stacked NMOS at the output stage and a dynamic gate bias generator providing appropriate control voltages for the gates of the stacked PMOS, gate-oxide overstress and hot-carrier degradation are avoided. Moreover, gate-tracking and floating n-well circuits are used to remove undesirable leakage current paths. The proposed topology can be applied to any technologies with the constraint of VDD