October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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182
Digital Systems
4. Ability to operate at a higher gate speed if we work with a reduced pull-up active
resistance
or use a BJT for active pull-up
compared to one internally used in NMOS
gates families.
When there is no pull up at O.D. NMOS, only 0 can be written at an output gate. The
previous stage to the output stage MOSFET provides gate voltage to drive it 0. At 0 also
there is no i
source
in steady state. With a pull-up 1 is also written at the O.D. gate.
When we want to use same O.D. gate as an input in bi-directional circuit, we have to
first write 1, so that from the previous stage gate voltage level is below threshold and
MOSFET drain-source ...
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