Transistor Internal Parameters for Small-Signal Representation

The joint IRE-AIEE Task Group 28.4.7, on Transistor Internal Parameters, was organized with the following objectives: 1) To formulate a small-signal equivalent-circuit representation of a transistor, the parameters of which emphasize separately the principal physical mechanisms of the device. 2) To recommend symbols for these parameters consistent with accepted usage and other standards. 3) To exhibit the relationship between the equivalent-circuit representation described in item 1 above and those simplified representations commonly employed in circuit analysis or design. 4) To propose and discuss methods of determining these parameters from electrical measurements at the terminals. This report summarizes the work of the group on the first three of these objectives.