Biasing the bjt, Electrical Engineering

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Q. Biasing the BJT?

A simple method of biasing the BJT is shown in Figure. While no general biasing procedure that will work in all cases can be outlined, a reasonable approach is to assign 1/2 VCC as the drop across the transistor, 3/8 VCC as the drop across RC to allowan adequate ac voltage swing capability in the collector circuit, and 1/8 VCC as the drop across RE, so that RE is about 1/3 RC. With a speci?ed supply voltage VCC, biasing consists mainly of selecting values for VCEQ, ICQ, and IBQ =  ICQ/β, which de?ne the operating Q point. One can then select

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