Applications: Summing Amplifier
The summing amplifier" is a versatile device for combining signals. It can either add signals directly, or scale them to fit some predetermined combination rule.
- Summing several signals with equal gains is done in an audio mixer.
- A summing amplifier with different resistors on the inputs gives a weighted sum. This can be used to convert a binary number to a voltage in a digital-to-analog converter.
- A summing amplifier can be used to apply a DC offset voltage along with an AC signal voltage. This is done in a LED modulation circuit to keep the LED in its linear operating range.