D $*10\mathrm{.}21$ In a CS amplifier, the resistance of the signal source Rig $*100$ kS$,$ amplifier input resistance $($which is due

to the biasing network$)$ Pin $=100$ k$\%,$ Cg: $=1$ pF$,$ Cga $*0\mathrm{.}2$ pF$,8$m $=5$ mA$/$V$,7$o $=25$ k$,$ and Ry $=20$ k$2.$ Determine

the expected $3-$&B cutoff frequency fy and the midband gain. In evaluating ways to double fa$,$ a designer considers the

alternatives of changing either Ry or Rin$-$ To raise fry as described, what separate change in each would be required?

What midband voltage gain results in each case?