AD744 Op Amp Compensated Non-Inverting Amplifier

Application

This circuit shows AD744 as a compensated non-inverting gain stage. It is a practical starter topology for evaluating a decompensated or externally compensated op amp in a simple closed-loop amplifier.

Design Context

Vin drives the non-inverting input through the interactive switch, RF and RG set a nominal gain of 2, and RL plus the LED load make output drive visible. CCOMP connects the two compensation pins so the auxiliary AD744 pins are intentionally wired instead of left floating. Split supplies provide headroom around the small input waveform.

Expected Behavior

The output should follow the input with approximately twice the amplitude while remaining centered around ground. The compensation capacitor is not meant as a precision stability design here; it demonstrates where the compensation network belongs and keeps the model pins explicit.

Key Values

• Vin: 1 V AC source through the switch.
• RF and RG: 1K each for nominal 2x non-inverting gain.
• CCOMP: 10 pF between COMP1 and COMP2.
• Supplies: +15 V and -15 V.

Suggested Experiments

• Change CCOMP and compare startup and waveform shape.
• Change RF or RG to explore closed-loop gain.
• Toggle the input switch and compare the input and output traces.

Featured Component

AD744 Op Amp is the featured seven-pin op amp; the demo highlights the normal input, output, supply, feedback, and compensation connections.