An NPN BJT has gm 38 mA/V Cμ = 10-14F, Cπ= 4*10-13F and β=90. For this transistor the unity gain frequency ( fT ) and upper 3-dB frequency fβ are

1.  fT = 1.64 * 108Hz & fβ = 1.47 * 1010Hz

2.  fT = 1.47 * 1010Hz & fβ = 1.64 * 108Hz

3.  fT 1.33 * 1012Hz & fβ = 1.47 * 1010Hz

4.  fT 1.47 * 1010Hz & fβ = 1.33 * 1010Hz

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4
Correct Answer :

fT = 1.47 * 1010Hz & fβ = 1.64 * 108Hz


Explanation :
No Explanation available for this question

Three identical RC – coupled transistor amplifiers are cascaded. If each of the Amplifiers as a frequency response as shown in the figure below, than the overall Frequency response is

1.  

2.  

3.  

4.  None of the above

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4
Correct Answer :

None of the above


Explanation :
No Explanation available for this question

The floating load V-I converter circuit is shown in the figure below The value of io is

1.  

2.  

3.  

4.  None of  these

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4
Correct Answer :


Explanation :
No Explanation available for this question

The current gain of the transistor circuit below is 100, then VCE IEQ is

1.   -6 V, 3.32mA

2.   5.32V, 4.62mA

3.  -5.32V, 4.62mA

4.  None

View Answer  
4
Correct Answer :

-5.32V, 4.62mA


Explanation :
No Explanation available for this question

The differential mode gain Adm of the amplifier at f = 1K Hz is

1.  100

2.  200

3.   300

4.  400

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4
Correct Answer :

200


Explanation :
No Explanation available for this question

A bipolar transistor is operating in the active region with a collector current of 1mA. Assuming that β of the transistor is 100 and the thermal voltage ( VT ) is 26mv. The trans conductance (gm ) and the input resistance (rπ ) of the transistor in the common emitter configuration are

1.  gm = 25mA/V and rπ = 15.625 kΩ

2.  gm = 40mA/V and rπ = 2.0 kΩ

3.  gm = 25mA/V and rπ = 2.5 kΩ

4.  gm = 40mA/V and rπ = 2.5 kΩ

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4
Correct Answer :

gm = 40mA/V and rπ = 2.5 kΩ


Explanation :
No Explanation available for this question

The common mode voltage gain of the amplifier at f = 60 Hz

1.  0.0001

2.  0.1

3.  0.01

4.  1

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4
Correct Answer :

0.01


Explanation :
No Explanation available for this question

For the circuit shown below, the current gain βF = 75. Find value of Rc & location of Q – point such that Q – point lies at the middle of the load line

1.  12.6 kΩ, 3V,4,46 mA

2.  1.26 kΩ, 6V,4.41 mA

3.  Not possible to find Rc as exact – location of Q – point is not given

4.  None

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4
Correct Answer :

1.26 kΩ, 6V,4.41 mA


Explanation :
No Explanation available for this question

The common mode rejection ratio of the amplifier is

1.  86.02

2.  86.02 dB

3.  68.02

4.  68.02 dB

View Answer  
4
Correct Answer :

86.02 dB


Explanation :
No Explanation available for this question

The type of the feedback system used for the above CMOS amplifier is

1.  Current – series feedback

2.  Current – shunt feedback

3.  Voltage- shunt feedback

4.  Voltage – series feedback

View Answer  
4
Correct Answer :

Current – series feedback


Explanation :
No Explanation available for this question
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