In the figure, D is a real silicon p-n juction diode with a drop of 0.7 V under forward bias condition and D is a Zener diode with breakdown voltage of -6.8 V. The input Vm(t) is a periodic square wave of period T, Whose one period is shown in the figure. 147 -14V 7.5 V and -20.5 V 6.1 V and -21.9 V 7.5 V and -21.2 V O 6.1 V and -22.6 V 10F HH t (sec) V(t) 10 ww AD Viood (t)