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NEET2008PhysicsSemiconductorsActual

The voltage gain of an amplifier with 9 % negative feedback is 10. The voltage gain without feedback will be

Options

  1. A90
  2. B10
  3. C1.25
  4. D100

Correct answer

D. 100

Step-by-step solution

The process of injecting a fraction of output energy of some device back to the input is known as feedback. When the feedback energy (voltage or current) is out of phase with the input signal and thus opposes it, it is called negative feedback. Voltage gain with feedback is A_ v f = A_ 1+ A_ where A_ is voltage gain without feedback and is negative feedback. Given A_ v f =10, =9 %= 9 100 array ll & 10= A_ 1+ 9 100 A_ or & 10+ 9 10 A_ =A_ or & 0.1 A_ =10 or A_ =100 array

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