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

Question

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

engineering Electrical-Engineering

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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