| ??? 12/20/05 12:30 Read: times |
#105584 - What you need Responding to: ???'s previous message |
...first of all is a synchronous rectifier, driven from your known reference clock.
The output is then essentially "DC" extracted from your frequency of interest - you wouldn't need your filter bank then. Failing that, then again, get a nice clean sqaure wave from your drive signal, and apply that to a switched capacitor filter as the reference clock. The filter would then automatically track your input frequency. Personally, I'd look at the synchronous rectifier /Phase sensitive detector/phase sensitive rectifier, they're pretty simple in terms of components - we use an analogue switch (DG403) and a programmable gain amplifier (INA 105) We can get at least 14 bit precision through that in our systems, where we are driving an LVDT. 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 |