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BIVUTI BHUSAN PANDA

· started a discussion

· 1 Months ago

discussion (Question: 298828.0 )

physics problems

Question:

In a common emitter amplifier the phase difference between the input signal voltage and the output voltage is:

Options:
A)

0

B)

π4    

C)

π2    

D)

π

Solution:

Ans: (d)

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student,

Output node of an amplifier is dependent on input voltage.

When input goes high i.e., Vbe > 0.7v, BJT is turned on helping output node to discharge.
When input is low i.e., Vde<0.7v , BJT is OFF helping o/p node to charge from supply.

So for low input we have high output and Viceversa.

So we see a 180 deg phase shift.

pi measures 180

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