An analytic method for calculating current sharing in emitter-coupled bipolar transistors

This paper describes an analytic method for calculating current sharing in emitter coupled bipolar transistors. We use a simplified Ebers-Moll transistor model to approximate current sharing by first ignoring the terminal resistances. We then derive an analytic equation to compensate the collector currents in order to include the effect of terminal resistances. The model is accurate for a wide range of device parameters. Our method has applications in emitter-coupled logic functional verification and timing simulation where current sharing in emitter-coupled transistors must be calculated