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A novel model of analyzing Schmitt trigger as 2 level (metastable/stable)energy system is presented. The energy of the 2 level system is identified. Inan MOS implementation, this arises from the electrostatic potential energy ofthe electrons on the gate to source capacitance of the cross coupled MOStransistors. The electrostatic energy, upon co-ordinate transformation,(incorporating the nonlinear MOS device behaviour and cross coupling), yieldsan expression for the 2 level system energy. The 2 level system, describedunder the transformed co-ordinate, is simulated. Simulation on the dynamics ofthe system shows a metastsable state and two stable states, corresponding tothe a maximum(metastable) energy and a minimum(stable) energy, as predicted bythe energy expression in the model. This result agrees with earlier attemptbased on nonlinear dynamic system approach, whereby the potential isinterpreted from the point of view of the gradient of vector field. Inaddition, the model gives physical design insight on how the change in circuitparameters (such as gm, R), affects the energy characteristics, hence leads toeffective design of such 2 level system.

Bistable Circuit Behaviour as a 2 level (stable/metastable) potential energy system