The PSpice simulation and analysis of weak signal detection circuit based on stochastic resonance in Duffing system

This paper revises the SNR theory approximate computational formula based on Duffing system with the system parameter of the first order differential term. The weak signal detection circuit based on stochastic resonance in Duffing system is simulated by PSpice software and from the simulation the relationships between SNR and some typical elements are discussed. The problem of operational amplifiers offset voltage accumulation in the circuit based on Duffing system is solved. The simulations confirm the feasibility of the weak signal detection circuit presented and especially verify the SNR improvement capacity.