- Joined
- Dec 18, 2013
- Messages
- 5,178
God it's so simple when you look at it again. To achieve 0.5 V on the inv terminal the output has to go to 0.4 V so effectively the gain is less than 1. As the input goes up the gain changes, when the input is 2 Volts the output will match this because the two inputs will also be matched due to the 1/2 supply on the inv input so the gain is 1. Effectively the 4K resistor is placed in parallel with the lower 120K to a varying degree.
Adam
Adam