with the help of neat block diagram, derive expression for Rjf, Rof, Gmf for voltage series negative feedback amplifier. Give significance of the above mentioned parameters.

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written 6.0 years ago by

teamques10 ★ 69k

modified 3.0 years ago by

sagarkolekar ★ 11k

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written 3.0 years ago by

sagarkolekar ★ 11k

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A = $\frac{vo}{vi}$ gain of ampli without f/b

Af = $\frac{vo}{vs}$ gain of ampli with f/b

$\beta$ = $\frac{vf}{vo}$ is feedback factor.

voltage gain with negative f/b

vs = vi + vf

but vf = $\beta$ vo

vs = vi + $\beta$ vo

"' y Vi = $\frac{vo}{A}$

vs = $\frac{vo}{A}$ + …

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