In the design of bipolar analogue integrated circuits, greater flexibility is often achieved when both NPN and PNP transistors are incorporated in the circuit design. Many present-day bipolar production processes use the conventional lateral PNP as the standard PNP transistor structures. For accurate modelling of such a lateral PNP transistor it is important to take the complex two-dimensional nature of the transistor into account. The physics based model Modella (MODEL LAteral) does exactly this, using a modelling approach whereby the main currents and charges are independently related to bias-dependent minority carrier concentrations. Current crowding effects, high injection effects, and a bias dependent output impedance are all taken into account.
The models are included in a dynamically loaded library called SiMKit. SiMKit is related to the following circuit simulators used within NXP®:
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