What is the range of Vcc for the circuit below to maintain soft saturation mode (200mV...

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Question

What is the range of Vcc for the circuit below to maintain soft saturation mode (200mV for B-C forward)?

V d009 0.8 V

B=100, Is 1x10-16A

V d009 0.8 V
B=100, Is 1x10-16A

Answer 1

Answer #1

soft saturation of BJT means BJT just entered into saturation and it still obeys the base and collector current relation.

$b c$

$I=1 x 10 16A$ , saturation current

Ib 1 x 10-16A/100 1 x 1018A

writing voltage equations on both(input and output) side. Vec I1k-0.2V+0.8V o.6volts 1x 10-16 x103-0.2V +0.8V = 1013+0.6

Ve1k x I0.2 1000 x 1 x 1016 + 0.2 0.2volts

Here 0.2 volts is the collector to emitter saturation voltage.

Hence supply voltage may vary from 0.2 volts to 0.6 volts for maintaining it in soft saturation region

Answer 2

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