R = 1.6e3;
C = 1e-9;
Cp= 1e-12;
tp = R * (C + Cp);
tz = R * Cp;
s = tf('s');
h = (1 + s*tz) / (1 + s*tp);
bodehz(h, 2*pi*logspace(1, 10, 200));

title('LPF2');
fixfig;