Design of ultrahigh-speed low-voltage CMOS CML buffers and latches

  • Authors:
  • Payam Heydari;Ravindran Mohanavelu

  • Affiliations:
  • Deparment of Electrical Engineering and Computer Science, University of California, Irvine, CA;International Rectifier, El Segundo, CA

  • Venue:
  • IEEE Transactions on Very Large Scale Integration (VLSI) Systems
  • Year:
  • 2004

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Abstract

A comprehensive study of ultrahigh-speed currentmode logic (CML) buffers along with the design of novel regenerative CML latches will be illustrated. First, a new design procedure to systematically design a chain of tapered CML buffers is proposed. Next, two new high-speed regenerative latch circuits capable of operating at ultrahigh-speed datarates will be introduced. Experimental results show a higher performance for the new latch architectures compared to the conventional CML latch circuit at ultrahigh-frequencies. It is also shown, both through the experiments and by using efficient analytical models, why CML buffers are better than CMOS inverters in high-speed low-voltage applications.