Apparatus for detecting variation in transistor threshold voltage
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United States of America Patent
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Jun 5, 2018
Issued Date -
May 25, 2017
app pub date -
Apr 21, 2016
filing date -
Nov 23, 2015
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Abstract
A ring oscillator includes a plurality of inverters. A closed loop structure is formed by cascading the inverters. The inverter includes at least one sensitive inverter with a diode-connected transistor. A variation in an MOSFET (Metal Oxide Semiconductor Field Effect Transistor) threshold voltage of the ring oscillator is detected by analyzing the oscillation frequency of the ring oscillator.
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