Electronics - Bipolar Junction Transistors (BJT) - Discussion
Discussion Forum : Bipolar Junction Transistors (BJT) - General Questions (Q.No. 20)
20.
With a PNP circuit, the most positive voltage is probably:
Discussion:
18 comments Page 1 of 2.
Vinay said:
1 decade ago
Since in forward biasing pnp emitter is +ve wrt base so veb is +ve but vbe will be -ve. Vcc needs to reverse bias collector so -ve. Vc is collector voltage wrt ground. Which is made -ve wrt ground. So appropriate answer is ground. Which is +ve wrt capacitor, same as base terminal, but -ve wrt emitter. So answer is ground.
Sarath said:
4 years ago
As PNP transistor diagram it represents conventional current flow (+ve to -ve) , here arrow indicate towards base terminal. So that current flow from ground to VCC. Ground is much +ve than other.
Sumita said:
1 decade ago
Because this is a pnp transistor, so while biasing -Vcc is applied to it. Thus with reference to ground all the voltage are negative, so ground is the answer.
Sayan said:
4 years ago
In the transistor biasing, we are using -Vcc which is true. But the Vbe voltage is positive right which is 0.7V. That's why the ground is positive.
Sukhpreet said:
1 decade ago
If we apply +Vcc then it will be max. Because maximum o/p can be Vcc. O/p can't more than Vcc. Then how can you say ground?
Seemanth said:
1 decade ago
In NPN transistor all voltages are positive.
But in PNP transistor all voltages are negative. So ground is positive.
But in PNP transistor all voltages are negative. So ground is positive.
(2)
Sandeep kr. gupta said:
1 decade ago
When doing transistor biasing then all voltage are negative with respect to GND hence GND is most positive to other.
Anomiii said:
6 years ago
Ground 0V is positive.
For PNP transistor because it has negatively biased -ve at collector end.
For PNP transistor because it has negatively biased -ve at collector end.
(1)
Pratyusha said:
1 decade ago
Its ground if it is in CE mode. If in any other mode then +vcc is the most positive.
Junpher said:
1 decade ago
I guest PNP transistor is "on" when its base is pulled low relaive to the emitter.
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