Exercise $4\mathrm{.}6\mathrm{.}1$

A bridge circuit is connected at the input side of an inverting op amp circuit.

$($a$)$ Obtain the Th$$venin equivalent at terminals $($a$,$ b$)$ for the bridge circuit.

$($b$)$ Use the result in $($a$)$ to obtain an expression for G$=$v$\_$o$/$v$\_$s$.$

$($c$)$ Evaluate G for R$1=$R$4=100,$ R$2=$R$3=101,$ and Rf$=100$ k$$