# 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.

4

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

4

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

4

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.

4

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

4

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

4

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

4

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

4

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.

4

Explanation :
No Explanation available for this question

1.

2.

3.

4.

4