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Non-inverting amplifier

Op-amps and analog ICs · Intermediate · about 15 minutes · part of Zen’s Electronics Design Mastery

Feed the signal into IN+ and feed back a fraction of the output to IN−. The op-amp drives the output until that fraction equals V_in: V_out = (1 + R_f / R_g) · V_in, in phase, with a very high input impedance.

Non-inverting amplifier: the circuit on the simulator's bench

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How it works

A_v = 1 + R_f / R_g = 1 + 22 kΩ / 10 kΩ = 3.20

V_out = 3.20 V RMS, in phase with the input. The source sees the op-amp’s input, which draws almost nothing.

Try it on the bench

Raise R_f to 47 kΩ for a gain of 5.7.
Remove R_g: the gain drops to 1, a voltage follower.

Parts on the bench

2 × Bench power supply
AC source
Op-amp
2 × Resistor
2 × Digital multimeter
Oscilloscope

In the course

Zen’s Electronics Design Mastery, module “Op-Amps & Analog ICs”.

Non-inverting amplifier

How it works

Try it on the bench

Parts on the bench

In the course

More on op-amps and analog ics