A two transistor current source circuit is shown below. The two transistors are not same and β>>1. IS2 are the reverse saturation current of transistor Q1 & Q2 respectively then the relationship between IO& IREF is

1.  

2.  IO = IREF [IS1 + IS2]

3.  IO = IREF [IS2 -IS1]

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Introduction of feedback in an amplifier increases the input impedance from 1KΩ to 40k. It is due to

1.  Positive feedback

2.  Shunt current negative feedback

3.  Series current negative feedback

4.  Shunt-voltage negative feedback

View Answer  
4
Correct Answer :

Series current negative feedback


Explanation :
No Explanation available for this question

A negative feedback amplifier, with A = 1000 and β = 0.20 will have an overall gain of about

1.  20

2.  200

3.  50

4.  5

View Answer  
4
Correct Answer :

5


Explanation :
No Explanation available for this question

For good stabilized biasing of the CE amplifier shown below, the condition is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

For the phase-Shift oscillator circuit shown below, the frequency of oscillation (f) and the value of R2 is Given R=10kΩ, C = 100pF

1.  f=65K Hz, R2 = 29KΩ

2.  f=91.8K Hz, R2 = 290KΩ

3.   f = 160k Hz, R2 = 29KΩ

4.  f=65K Hz, R2 = 290KΩ

View Answer  
4
Correct Answer :

f=65K Hz, R2 = 290KΩ


Explanation :
No Explanation available for this question

With negative feedback, the gain bandwidth product of an amplifier would be

1.   Increased

2.  Decreased

3.  Neither increased nor decreased

4.  None

View Answer  
4
Correct Answer :

Neither increased nor decreased


Explanation :
No Explanation available for this question

In a negative feedback voltage amplifier, with A = 103 and β = 0.2 there is an unwanted hum voltage of IV at it’s output before feedback is applied. With negative feedback, the hum voltage will be

1.   IV

2.   0.2V

3.  5 mV

4.  1 mV

View Answer  
4
Correct Answer :

5 mV


Explanation :
No Explanation available for this question

In a negative feedback voltage amplifier, with A = 103 and β = 0.2, the input resistance is 1KΩ before voltage negative feedback is applied. After negative feedback the input resistance will be

1.   200 KΩ

2.  5Ω

3.  1 MΩ

4.  5KΩ

View Answer  
4
Correct Answer :

200 KΩ


Explanation :
No Explanation available for this question

The current mirror using two NMOS transistors is shown below. If both MOSFET M1 and M2 are biased in saturation region then current equation of output current is (VTn1 & VTn2 are threshold voltage of M1 and M2 respectively )

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Which of the following represents output wave form of the circuit for the sinusoidal input shown below (Assume ideal diode)

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question
Previous Next

Interview Questions

MongoDB
Java Script
Node JS
PHP
JQuery
Python