Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Draw the circuit diagram of a common emitter transistor amplifier. Write the expression for its voltage gain. Explain, how the input and output signals differ in phase by  <img alt="180^{\circ}" src="https://entrancecorner.codecogs.com/gif.latex?1

Draw the circuit diagram of a common emitter transistor amplifier. Write the expression for its voltage gain. Explain, how the input and output signals differ in phase by  180^{\circ}.

 

 

 

Answers (1)


The voltage gain of the amplifier
A_{v}= \frac{V_{0}}{V_{in}}= \frac{\bigtriangleup V_{cE}}{r\bigtriangleup I_{B}}
where r= R_{B}+r_{i}
where r_{i} is the input voltage
A_{V}= -\beta _{ac}\, \frac{R_{L}}{r}
Since \bigtriangleup V_{cE}= -\beta _{ac}R_{L}\bigtriangleup I_{B}
The negative sign represents that output voltage is opposite out of phase with the input voltage. When input base voltage/current is increased the collector current increase, so the drop across collector resistance increases. Therefor output decreases. Thus input and output are out of phase.
 

Posted by

Safeer PP

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE Class 10, 12 practical exams 2025 for compartment students from July 10; detailed guidelines issued
anam-khan

CBSE Central Sector Scheme of Scholarship 2025 applications open on scholarships.gov.in
anam-khan

CBSE Board 2025: Class 10th, 12th supplementary date sheet out; exams from July 15

Latest Question