Transistor circuit with transistor characteristic sensor
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United States of America Patent
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Jun 25, 1996
Issued Date -
N/A
app pub date -
Dec 21, 1993
filing date -
Nov 29, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Circuits embodying the invention include means for sensing certain characteristics (e.g. speed of response and conductivity) of the transistors formed on an integrated circuit (IC) and for using the sensed results to control the operation and structure of a circuit formed on the IC. An output driver circuit embodying the invention includes numerous pull-up transistors connected in parallel between a high power supply line and an output terminal and numerous pull-down transistors connected in parallel between the output terminal and the low power supply line. The number of transistors which are turned-on at any one time is selectively controlled as a function of the characteristics (e.g. conductivity and speed of response) of the transistors of the circuit. The higher the speed of response or the conductivity of the transistors, the fewer the number of pull-up or pull-down transistors which are turned-on.
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