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CBSE Class 12-science Answered

Voltage gain of an amplifier with 10 % positive feedback is 10. The voltage gain without feedback is
1. 5
2. 0.5
3. 0.05
4. 50
Asked by rajeshtitu | 19 Jul, 2016, 09:13: PM
answered-by-expert Expert Answer
begin mathsize 14px style The space voltage space gain space without space feedback space is space straight A subscript straight v.
The space voltage space gain space with space feedback space is space straight A subscript vf.
When space positive space feedback space is space given comma space we space have
straight A subscript vf equals fraction numerator straight A subscript straight v over denominator 1 minus βA subscript straight v end fraction
straight beta equals 10 percent sign equals 0.1
therefore 10 equals fraction numerator straight A subscript straight v over denominator 1 minus 0.1 straight A subscript straight v end fraction
therefore 10 minus straight A subscript straight v equals straight A subscript straight v
therefore 2 straight A subscript straight v equals 10
therefore straight A subscript straight v equals 5 end style
Answered by Romal Bhansali | 20 Jul, 2016, 11:46: AM
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