module: second_order_loopfilter
parameters: double a1 double a0 double b2 double b1 double b0
inputs: double in 
outputs:  double out
static_variables:
classes: Filter filt("b2*s^2+b1*s+b0","s^2+a1*s+a0","b2,b1,b0,a1,a0,Ts",b2,b1,b0,a1,a0,Ts);
init: 
code:
filt.inp(in);
out = filt.out;
/////////////////////////////////////////////////////////////////////////
