| ??? 08/23/10 11:22 Modified: 08/23/10 11:37 Read: times |
#178237 - Bias needed Responding to: ???'s previous message |
It is normal that you get 2V (in fact GND if OP07 could produce 0V with single supply!). This is because U1 -input is connected to ground via the photodiode, and +input also is GND. You need to bias the photodiode, in this case with some resistor connected to a +V supply. And feed U1 with both + and - V supplies. With your circuit, you will get a [edited]non-inverted output, but shifted. There are other different configurations possible.
Daniel |
| Topic | Author | Date |
| Wrong concept yields wrong simulation? | 01/01/70 00:00 | |
| GIGO indeed | 01/01/70 00:00 | |
| COntrol loop | 01/01/70 00:00 | |
| Simulation circuit | 01/01/70 00:00 | |
| Bias needed | 01/01/70 00:00 | |
| OP07... | 01/01/70 00:00 | |
| It's a correct feedback loop | 01/01/70 00:00 | |
| Biasing and dual supply for opamp | 01/01/70 00:00 | |
| Find out Why.. | 01/01/70 00:00 | |
| Not required | 01/01/70 00:00 | |
Drop of photodiode? | 01/01/70 00:00 | |
| You don't need the additional parts | 01/01/70 00:00 |