Return ratio for a circuit is 220. What is the amount of feedback, correct up to 2 decimal places?(a) 2.34 dB(b) – 46.84 dB(c) – 46.88 dB(d) 46.88 dBThe question was asked in an online interview.This question is from Effects of Feedback in division General and Feedback Amplifiers of Analog Circuits

Return ratio for a circuit is 220. What is the amount of feedback, cor

1.	Return ratio for a circuit is 220. What is the amount of feedback, correct up to 2 decimal places?(a) 2.34 dB(b) – 46.84 dB(c) – 46.88 dB(d) 46.88 dBThe question was asked in an online interview.This question is from Effects of Feedback in division General and Feedback Amplifiers of Analog Circuits
Answer» The correct choice is (c) – 46.88 dB Easiest EXPLANATION: Return ratio is Aβ, where β=FEEDBACK FACTOR, and A=open loop gain. Amount of feedback is AF/A = 1 + Aβ In DECIBELS, amount of feedback = -20log10(1+Aβ) = -20log10(221) = -46.88 decibels.

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