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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.
1 Answer
written 2.1 years ago by |
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 = $\frac{vo}{A}$ + …