Single-Loop Feedback Parameter Extraction Method for Stability Analysis of Electronic Circuits

Stability analysis of analog circuits that incorporate single-loop feedback is often associated with determining the loop transmission Aβ and subjecting it to the Nyquist stability criterion. Various techniques have been developed to extract Aβ from a circuit. However, proper application of the Nyquist stability criterion requires information about A and β separately, before establishing their product. This paper will present a method to identify the feedback parameters A and β of a circuit without breaking the loop unlike any other method seen previously. A second-order filter example will be provided to justify the proposed method.