A New Optimization and Statistical Analysis for Widlar Current Source using Predictive MOSFET Models

Technological process evolution can be described using advanced MOS models, focusing a low-currents reference as an excellent demonstrator. Using Monte Carlo method in a circuit simulation program, this paper offers a new approach on the influence of MOSFET threshold voltage on a classic Widlar current source, as a parameter with great impact in circuit behavior prediction, using both classical models and short-channel models for simulations. Finally, a new optimization method for the sum of the two resistances in Widlar mirror, based on an original mathematical calculus is presented.