AMP01 Precision Instrumentation Amplifier

Application

This circuit demonstrates the AMP01 as a precision instrumentation amplifier with separate output-stage supply pins tied to the main rails.

Schematic

The signal path runs left to right through U1. RG is placed next to the gain pins, OUT is tied back to SENSE for local feedback, REF and RS pins are parked on the reference bus, and OUT V+/OUT V- are visibly tied to the corresponding supply rails.

Design Context

VIN+ is 110 mV and VIN- is 100 mV for a small bridge-like differential input. RG is 49.9 kOhm, REF is grounded, and the output stage shares the same +/-15 V rails as the main amplifier.

Expected Behavior

The operating-point table should show VIN+ slightly higher than VIN- and a positive Vout. The output should respond to the differential input and remain referenced to the grounded REF pin.

Key Values

• VCC / VEE: +15 V and -15 V.
• Inputs: 110 mV and 100 mV.
• RG: 49.9 kOhm.
• OUT tied to SENSE.
• OUT V+ / OUT V- tied to the main rails.
• RLOAD: 10 kOhm.

Suggested Experiments

• Change RG and compare the output scaling.
• Drive REF from a small DC source to shift the output baseline.
• Disconnect the load or change RLOAD to inspect output loading.

Featured Component

U1 is the AMP01 Instrumentation Amplifier. IN+ and IN- sense the differential input, RG sets gain, SENSE closes the local output feedback path, REF sets the baseline, output-stage supply pins feed the driver stage, and OUT drives RLOAD.