| ??? 12/22/05 17:06 Read: times |
#105768 - Validation Responding to: ???'s previous message |
Kai Klaas said:
.
The lock-in methode can be used with square waves, on the other hand! But to get high and stable precision at frequencies like 10kHz is really difficult. You will need ultra fast and precise switches, then. Thanks for the validation of the technique. Did I mention lock-in amplifiers ? I'd forgotten that that is yet another synonym for the damned things. You might improve the performance of the system by using a different analogue switch, but in the switched gain config shown in the TI/Burr-Brown datasheet, I doubt they will have terribly much influence, since the gain setting resistors are of the order of 25K and the on impedance of the switches is less than 50 Ohms. Internal crosstalk is also very low. Of course, I am only interested usually in a very very pure sine wave entering my system. Steve |
| Topic | Author | Date |
| Automatic Filter Selection | 01/01/70 00:00 | |
| FFT? | 01/01/70 00:00 | |
| No! | 01/01/70 00:00 | |
| Input frequency | 01/01/70 00:00 | |
| more information... | 01/01/70 00:00 | |
| What you need | 01/01/70 00:00 | |
| much more information | 01/01/70 00:00 | |
| AD630, for instance | 01/01/70 00:00 | |
Validation | 01/01/70 00:00 | |
| Much more information is needed | 01/01/70 00:00 |