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Q. The gain of an amplifier without feedback is 100 and the gain of an amplifier with feedback is 200. Calculate the feedback fraction.
Solution : Voltage gain after feedback,
Af = A / 1 - Aβ
200 = 100 / 1 - 100 β
2 = 1 / 1 - 100 β
2 - 200 β = 1 (that is) 200 β = 1
β = 1 /200 = 0.005
Q. The minimum wavelength of X-rays produced in a Coolidge tube is 0.05 nm. Find the operating voltage of the Coolidge tube. λmin = 12400 A 0 / V = 0.5 X 10 -10 m Theref
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