A diff amp is sometimes called a long-tail pair because the two transistors share a common collector resistor.

Name: A diff amp is sometimes called a long-tail pair because the two transistors share a common collector resistor.
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A diff amp, or differential amplifier, is sometimes called a long-tail pair because the two transistors share a common emitter resistor, not a collector resistor. This configuration helps in achieving high input impedance and differential mode amplification.

A Diff Amp Is Sometimes Called a Long-Tail Pair Because