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Static current amplification

المؤلف:  Stan Gibilisco

المصدر:  Teach Yourself Electricity and Electronics

الجزء والصفحة:  405

10-5-2021

2610

Static current amplification

Current amplification is often called beta by engineers. It can range from a factor of just a few times up to hundreds of times.
One method of expressing the beta of a transistor is as the static forward current transfer ratio, abbreviated H_FE. Mathematically, this is
H_FE = I_C/I_B
Thus, if a base current, IB, of 1 mA results in a collector current, IC, of 35 mA, HFE = 35/1 = 35. If I_B = 0.5 mA yields I_C = 35 mA, then H_FE = 35/0.5 = 70.
This definition represents the greatest current amplification possible with a given transistor.