Electronics - Bipolar Junction Transistors (BJT) - Discussion
Discussion Forum : Bipolar Junction Transistors (BJT) - General Questions (Q.No. 6)
6.
In a C-E configuration, an emitter resistor is used for:
Discussion:
15 comments Page 1 of 2.
Jay said:
1 decade ago
Please give us the explanation.
Syed asif rehman said:
1 decade ago
Emitter resistor is placed during emitter biasing technique. A capacitor parallel to emitter resistor is placed to bypass ac signal because if ac signal passes through emitter resistor then the operating point may shift. Therefore we can say that emitter resistor is used for stabilization.
@sha said:
1 decade ago
Syed is correct.
Karim said:
1 decade ago
Syed is correct
Vijjju said:
1 decade ago
@sayed
The ques is about why we place the emiter resister and you gave the explanation about the emitter capacitor.
So your explanation is wrong.
The ques is about why we place the emiter resister and you gave the explanation about the emitter capacitor.
So your explanation is wrong.
Sobhan bandopadhyay said:
1 decade ago
TO bypass the ac signal we use capacitor, to bias the collector we have to give a signal to base, to increase gain we have to modified the tang circuit. So there is last option is to stabilization.
Veerendra said:
1 decade ago
In general, we stabilise the model with the help of self biasing technique, the other method is to place a resistor Re, in the feedback path.
Sukhpreet said:
1 decade ago
Emitter resistor provides stabilization against temperature or due to transistor parameters.
(1)
Amuthan said:
1 decade ago
THe stability of the amplifier is achieved when a negative feedback in given to limit the gain of the amplifier. RE gives a negative feedback and hence it stabilises the circuit.
Ahmed al shaer said:
1 decade ago
The cause of the emitter resistor is that it stabilize the current and gain against temperature rise, also against aging, and replacement, that if the temperature include so Ic will increase according to a relation directly proportional to T^ (3/2) , then after analyzing the emitter base junction (taking a kvl) we'll find that Ib dec so Ic = beta*Ib so it will then decrease so we have a variable current gain.
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