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Usefulness of Computeraided Design
Which Model to Use?
Components of QB
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active region analysis assumed assumption barrier potential base current base-emitter basewidth modulation bias bipolar junction transistor Bipolar Transistors capacitor characteristics circuit collector current collector-base junction components constant current levels curve tracer defined Definition depletion approximation described determined device diffusion capacitance diodes Early voltage Electronics EM-j model EM3 and GP EM3 model emitter emitter-base junction equations frequency given GP model Gummel high currents high-1evel injection hybrid-i IEEE input parameters integrated Integrated Circuit junction capacitance junction voltage linear ln(I low currents low-1evel injection low-current majority carrier majority charge Measurement Scheme measurement technique mobile charge neutral base region nonlinear normal notation npn transistor obtained ohmic resistances operating p-n Junctions plot programs reference currents s-parameter saturation current Section shown in Fig slope small-signal space-charge layer Tektronix temperature tion Typical Value variation of Tp zero