Measurement of Spice Parameters for Bipolar Junction Transistors

摘要

In order for the circuit simulation program SPICE2 to accurately portray an actual transistor circuit, the program must be able to accurately represent the operating characteristics of the transistor. This can be done when the program user specifies transistor parameters that vary from one transistor to another. This investigation develops techniques for determining SPICE2 parameters for a bipolar junction transistor (BJT) using measurement data obtained primarily through the use of the Hewlett-Packard Vectra/PC Instruments integrated instrumentation system. The models which form the foundation for the SPICE2 treatment of the BJT are first discussed. Thirty-two of the forty SPICE2 BJT parameters are examined, and twenty-four of them are actually determined experimentally for four test transistors. The results are then verified in calculations that compare the theoretical, or calculated, values of transistor terminal currents and junction capacitances to actual measured values.