| ??? 12/22/05 16:01 Read: times |
#105764 - AD630, for instance Responding to: ???'s previous message |
R said:
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. Have a look at this: http://www.analog.com/en/prod/0...30,00.html R said:
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. R also said:
I still think I might need calibrating ADC at each frequency if I use filter bank The problem with your methode is, that you use a square wave for stimulation, but will loose the square wave shape, when using your filter bank. Or by other words, your signal shows a wide bandwidth, which will also be affected by your filter bank, not only the noise. 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. Kai |
| 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 |