An offset-tolerant current-sampling-based sense amplifier for Sub-100nA-cell-current nonvolatile memory

Abstract

In this study, the authors propose a new offset tolerant current-sampling-based SA (CSB-SA) to achieve 7x faster read speed than previous SAs for sensing small <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ICELL</i> . A fabricated 90nm 512Kb OTP macro, using the CSB-SA and our CMOS-logic compatible OTP cell, achieves 26ns macro random access time for reading sub-200nA <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">lCELL</i> . Measurements also confirmed that this 90nm CSB-SA could achieve sub-100nA sensing.