module: fourth_order_loopfilter
parameters: double a3 double a2 double a1 double a0 double b4 double b3 double b2 double b1 double b0
inputs: double in 
outputs:  double out
static_variables:
classes: Filter filt("b4*s^4+b3*s^3+b2*s^2+b1*s+b0","s^4+a3*s^3+a2*s^2+a1*s+a0","b4,b3,b2,b1,b0,a3,a2,a1,a0,Ts",b4,b3,b2,b1,b0,a3,a2,a1,a0,Ts);
init: 
code:
filt.inp(in);
out = filt.out;
