title: Characteristic Equation of A Closed Loop System in Terms of PI Controller
body: <p>Just wondering if you could guide me on how to find the characteristic equation of a trasfer function G(s) (see below for G(s)) in terms of the coefficients in the PI controller?</p>
  
  <p>G(s) = 45/(5s + 2)</p>
  
  <p>No sure what to do here, as I'm used to just multiplying the error by the proportional gain - but there's no error value provided.</p>
  
  <p>Any advice would be much appreciated. Thanks in advance ;)</p>