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Current source makes novel Class A buffer.

EDN

| April 03, 2008 | Koelzow, Horst; Small, Charles H; Granville, Fran | COPYRIGHT 2009 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

Horst Koelzow, Winnipeg, MB, Canada

Edited By Charles H Small and Fran Granville

The basis for this Design Idea is a classic two-transistor current source (Figure 1 ). Current through R1 depends only on the VBE (base-emitter voltage) of Q2 and on the value of R1 itself. The VBE of Q1 has no impact on the output current. Typically, this circuit finds use as a steady current source or as a limiter. The circuit forms the amplifier for the upper, positive half of the signal. Adding a complementary stage for the lower, negative half of the signal completes the buffer (Figure 2 ). The emitters of Q2 and Q3 become the input for the circuit, and the junction of …

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Source: HighBeam Research, Current source makes novel Class A buffer.

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