Various Behaviors of Wien-Bridge Circuit and Quasi-Wien-Bridge Circuit in Different Situations

Detail behaviors of Wien-bridge circuit and three more similar circuits are revealed by adopting new loop gain expression and proper analyses which including complex-domain analysis and phasor analysis. An amplifier is also introduced to testify the realistic loop gain in phasor form for each oscillator. New oscillation phenomenon is found as well as new oscillator. What is more, the quantitative relationships produced by complex-domain analysis or phasor analysis are compatible, and coincide with experimental results.