Two stage cmos op amp — Free Electronics Illustration

Electronics

Two stage cmos op amp

Textbook-style black line-art transistor-level schematic of a two-stage CMOS operational amplifier. The left stage is a differential-input MOSFET pair with matched transistors, a tail bias current-source transistor below, and an active current-mirror load above, producing a single-ended first-stage output. This node drives a right-side second gain stage implemented as a common-source MOSFET amplifier with an active current-source load, ending at a single output node on the far right. Include standard PMOS and NMOS transistor symbols with visible gates, drains, and sources, labeled differential input terminals on the left, labeled supply rails with VDD at the top and VSS at the bottom, bias current-source branches, balanced compact spacing, and clear left-to-right signal flow. A Miller compensation capacitor is connected between the first-stage high-gain node and the final output node, emphasizing the classic compensated two-stage op-amp structure.

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