Research on Oscillation Behavior of Sallen-Key Low-Pass Filter Circuit Based on Hybrid Diode
In this paper,a kind of Sallen-Key low-pass filter oscillator circuit based on hybrid diode is designed.The hybrid diode composed of PN junction diode,inductor and capacitor is connected to the input end of the low-pass filter circuit,and a chaotic oscillation circuit with complex dynamic behavior is constructed.Asymmetry coefficient is introduced to simulate the deviation of electrical characteristics between diode elements in the actual circuit.The phase trajectory diagram,bifurcation diagram and Lyapunov exponential spectrum of specific parameters are used to numerically analyze the two oscillation states under the symmetry and asymmetry coefficient of the oscillation circuit,and the unique attractor coexistence phenomenon in the oscillation circuit is found.The rich dynamic behavior evolution processes such as symmetric,asymmetric coexisting bifurcation and anti-monotone characteristics regulated by circuit parameters are revealed.Finally,based on FPGA technology,the digital circuit experiment of oscillation circuit is completed,and the correctness and physical realizability of numerical simulation are verified.
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