| ??? 12/21/05 04:33 Modified: 12/21/05 04:36 Read: times |
#105631 - much more information Responding to: ???'s previous message |
thanks, I never have used synchronous rectifier for signal and I searched google for that, but with not much success. If you know any online material on this subject please give me the address. I doubt switched capacitor filters are suitable for 16bit precesion, even if they are, the question of calibration still remains. for some members that still need more information
here it is: frequency of signal ranges from DC to 10KHz, a square wave voltage stimulates a circuit and current is measured(precisely), the signal is output of current to voltage converter. amplitute is from +/-100uV to +/-5V. no unsuppressed carrier. noise source is mainly from digital section of board and external noise that comes with signal. the device is in faraday cage. analog and digital section(Gnds) carefully has been separated. I still think I might need calibrating ADC at each frequency if I use filter bank and I think switched capacitor filters are not suitable, but about filter bank or synchronous rectifire I need to study them more. Regards. |
| 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 |