Abstract: As we all know, “virtual short” and “virtual break” are important methods to analyze operational amplifier circuit in analog electronic technology. However, we have found in many years of practice and teaching that this method can also be skillfully applied to the analysis of some resonance problems in the basis of circuit analysis. Moreover, this technique is simple and intuitive, and it can avoid many complicated calculations. So it is convenient and fast to apply. In this paper, the practicability of the proposed method is verified by theoretical analysis and practical examples, and it has much value in related circuit analysis.

Key words: virtual short, virtual break, series resonance, parallel resonance, resonant frequency