function cic_plot(M, N, R)
% cic_plot(M, N, R)

ns = 1000;
f = 2*(1:ns)/ns;
H = abs(sin(pi*M.*f)./sin(pi.*f/R)).^N;

subplot(2,1,1)
plot(f,H); 
xlabel('f / fs');
ylabel('G');
grid;

Gain = (R*M)^N
BitGrowth = ceil(N*log2(R*M))

subplot(2,1,2)
plot(f,20*log10(H/Gain));
xlabel('f / fs');
ylabel('A/dB');
grid;

Atten_fs2 = 20*log10(H(ns/2)/Gain)