Bicmos Inverter Upload
Bicmos Inverter Upload
Bicmos Inverter Upload
Fall-2014-2015
BiCMOS INVERTER:
Made up of both Enhancement type Field Effect Transistor (MOSFET) and
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(A
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biasing resistors {collector, base and emitter} has been ignored for simplicity)
UB
)
Bipolar Junction Transistor (BJT) and hence the name BiCMOS. (The BJT
The output cannot go to VDD or Ground unlike for what we saw in the case of
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CMOS inverter.
ica
The 0.7V drop for high and low logic comes from the base to emitter junction
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Section-B
Fall-2014-2015
Note: Caution should be exercised when working with the output of BiCMOS
gates with CMOS logic. The low output voltage of 0.7V is very close to the
UB
)
threshold voltage of the n-channel transistor. (CMOS gates with switching point
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Operating Principle:
(A
I
HIGH / 1
state.
LOW / 0
LOW / 0
Q1 to be at held at ground
potential
by
the
short
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In
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Section-B
Fall-2014-2015
UB
)
held @ VDD.
LOW / 0
Vin=VDD.
HIGH / 1
HIGH / 1
OFF state.
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(A
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Am
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In
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down condition.