Accurate simulation of switched systems using PSpice and VHDL-AMS Accurate simulation of switched systems using PSpice and VHDL-AMS
نویسندگان
چکیده
The paper deals with behavioral modeling of idealized systems with discontinuities. The purpose of such models is to obtain the first-order effects to verify analytic calculations or to increase simulation speed. Traditional algorithms for the time-domain analysis implemented in Spice-class simulators are based on the assumption of smoothness and continuity. Abrupt changes of system parameters or even discontinuity during switching cause numerical errors. The VHDL-AMS language brings radically different approach in comparison with Spice [VHD99]. The system of differential algebraic equations (DAE) can be formulated explicitly and can be structurally changed during simulation. The basic principles will be demonstrated on the modeling of switched power supplies. Numerical algorithms for the time-domain analysis of continuous-time circuits are based on the formulation of circuit equations into the DAE system 0 x x = ) , , ( t F & , (1)
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