D$15\mathrm{.}4($a$)$ Design a two$-$pole high$-$pass Butterworth active filter with a cutoff frequency at f$3$ dB $=25$ kHz and a unity gain magnitude at high frequency. $($b$)$ Determine the magnitude $($in dB$)$ of the gain at $($i$)$ f $=22$ kHz$,($ii$)$ f $=25$ kHz$,$ and $($iii$)$ f $=28$ kHz$.$