Common mode half circuit — Free Electronics Illustration

Electronics

Common mode half circuit

Compact black line-art textbook schematic of the common-mode half-circuit of a differential pair using a BJT. Show a single NPN transistor branch with the base driven by a common-mode input node labeled vicm or equivalent, the collector connected upward through a resistor load to the supply side, and the emitter connected downward through an equivalent doubled tail resistance labeled 2RSS or an emitter-side resistance representing the shared tail path. Output is taken at the collector. The drawing should look like one side of a differential pair analyzed alone, as a simplified small-signal half-circuit.

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