I am trying to understand S-K LPFs. Using Okawa’s online calculations there is a provision for evaluating oscillating frequencies. First question, if the poles are located at 45 degrees in quadrants 3 and 4, how can the system oscillate? As an example: Non-inverting input, Av (K) = 1, R1 = R2 = 102.3K ohms, Cf = 44 nf and Cg = 22 nf; Fc = 50 cps, Fo ~ 35 cps, both damping and Q are 0.707.
My second question, what is the formula for calculating oscillating frequency in an S-K LPF?
THANK YOU FOR YOUR TIME AND EFFORT!!!
My second question, what is the formula for calculating oscillating frequency in an S-K LPF?
THANK YOU FOR YOUR TIME AND EFFORT!!!