#2nd Order Low Pass Delta Sigma Modulator, as per p. 35 and 111 of Thesis
V1 u 0 SIN -20dB 976.5625u
@a1 u2 u y 1.0 -1.0
@a2 v u2 v2 1.0 1.0
@d1 v2 v 1

@a3 v3 v y 1.0 -1.0
@a4 x v3 x2 1.0 1.0
@d2 x2 x 1

q1 y 0 x 0 1b

.step 1
.time 1024
#.nprint v(y)
.fft window hann v(y) >2nd.fft

.lib 1b.lib