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Analogue and Mixed Signal IC Design

Analogue and Mixed Signal Integrated Circuit Design

Bipolar Transistor Calculators

Contents

1. BJT Parameter Calculator

This calculator is intended to show you quickly and easily the relationship between BJT parameters and such things as gm and input resistance. It is only valid at room temperature and is not intended to replace a simulator.

Please Note:

indicates input boxes

indicates output boxes
Parameter Note: VT is assumed to be 26mV
Saturation Current IS  
Area A  
Collector Current IC mA
Forward current gain BF &nbps;
Early Voltage VAF Volts
Base-emitter voltage VBE Volts
Transconductance gm mA/V
Input resistance rin kOhms
Output resistance ro kOhms

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2. VBE Calculator

This calculator allows you to input values for IS, area and collector current for two transistors. The calculator will then give you the VBE for the two transistors and the difference between them. Again, it is only valid at room temperature.

Please Note:

indicates input boxes

indicates output boxes
VT is assumed to be 26mV
    Q1 Q2  
Saturation Current IS  
Area A  
Collector Current IC mA
Base-emitter voltage VBE mV
VBE1 - VBE2 delta VBE mV

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