Active loaded mos differential pair — Free Electronics Illustration

Electronics

Active loaded mos differential pair

Black textbook-style transistor-level schematic of an active-loaded MOS differential amplifier. Two matched lower MOSFETs form a symmetric differential pair, with their gates driven by opposite input signals and their sources tied together at a common source node connected to a tail current source referenced to ground. At the top, two matched MOSFETs form an active-load current mirror connected to the positive supply, with one of the upper transistors diode-connected. The drains of the lower pair connect to the current-mirror load, and a single-ended output is taken from one drain node on one side. Clean balanced left-right layout with four transistor symbols.

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