I have this transfer function:$$H(s) = 15 \cdot \frac{(1k)^2}{s^2+500 s+(1k)^2} \cdot \frac{s+40}{s+300}$$
I separated it into two stages, diving the \$k=15\$ so that both transfer functions have similar gain in \$w_0=1k\$.$$\begin{aligned}H_1(s)&= 5 \cdot \frac{(1k)^2}{s^2+500 s+(1k)^2} \\[1.5em]H_2(s)&= 3 \cdot \frac{s+40}{s+300}\end{aligned}$$
For \$H_1\$ I used a low pass Sallen-Key and I got all the values that work.
My problem is with \$H_2\$. I tried several configurations of \$Z_1\$ and \$Z_2\$ of a non inverting op amp but could not get any values that satisfy the transfer function. Anyone has any recommendation or knows what I am doing wrong.
