Problem $4$: For the following BJT circuit shown $($CE circuit$)$ with beta $=225,C=196pF,C=8pF,rx=19,r0=22\mathrm{.}5K,gm=385mS,r=585.$

Determine:

a$)$ Find the midband voltage gain of AM

b$)$ Estimate the low corner frequency $fL$ using short$-$circuit time constant method.

c$)$ Draw a detailed small$-$signal high frequency model for the amplifier

d$)$ Estimate the upper $3$dB frequency of the circuit or fH $.$ using Use Miller method

e$)$ Find the upper cutoff frequency using the open$-$circuit time constant method. Compare it with what you get from Step d$.$