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Dual FET-input audio operational amplifier

OPA2134 Internal Circuitry

Explore the internal circuitry and functional stages of OPA2134.

Package view

Inside OPA2134

Two FET differential inputs, compensated gain paths and output drivers.

Two FET-input amplifier channels inside a compact OPA2134 IC. A: positive 3, negative 2, output 1. B: positive 5, negative 6, output 7. Shared supplies 8 and 4.
Functional cutaway; internal compensation is included. External feedback sets the gain.

Explore the circuit

Select a stage to see its role and connections

Input stages

The true FET input stage provides high input impedance and low room-temperature bias current. Source impedance, board contamination and rising temperature can still create measurable errors.

Gain and compensation

Each channel has an internal voltage-gain path and frequency compensation.

Output drivers

Each output can drive an appropriate load inside its specified swing. Leave supply headroom and check capacitive-load stability; the short-circuit current is not a normal continuous-load rating.

Component view