| ??? 07/28/10 05:36 Read: times |
#177495 - 0-10mV Responding to: ???'s previous message |
A 0->10mV signal is almost always going to require signal conditioning before it can be converted to digital and used by either a microcontroller or DSP device.
The signal conditioning will probably have to include all of the following: 1) Voltage amplification to reach a signal range suitable for conversion by the A/D converter. 2) Impedance buffering if the source impedance is not compatible with loading impedance. 3) Isolation if the signal source needs to be protected from the signal processing entity. (As described so far in this thread this will be an essential requirement due to the medical nature involved). 4) Analog low pass filtering to inhibit frequency components in the input signal that are greater than half the sampling rate from reaching the A/D converter. 5) Instrumentation amplifier type connections to the signal source to try to condition the signal in a way that helps cancel out common mode noise in the system. At a 10mV signal level the common mode noise can be a hardy challenge in any type of microcontroller or DSP system. Michael Karas |
| Topic | Author | Date |
| Digital Signal Processor/Controller novice tips.. | 01/01/70 00:00 | |
| EMG ? | 01/01/70 00:00 | |
| EMG | 01/01/70 00:00 | |
| Correct | 01/01/70 00:00 | |
| perhaps a little more detail would help | 01/01/70 00:00 | |
| ARM is a good place to start. | 01/01/70 00:00 | |
| dspic scary? | 01/01/70 00:00 | |
| not always "the plan" | 01/01/70 00:00 | |
| SiLabs has something ... | 01/01/70 00:00 | |
| The Type of Signal.. | 01/01/70 00:00 | |
| 0-10mV | 01/01/70 00:00 | |
| 0-10mV in 8051 | 01/01/70 00:00 | |
| Avoid steep filters if ou can | 01/01/70 00:00 | |
| Following Nyquist is the bare minimum | 01/01/70 00:00 | |
| Aliasing | 01/01/70 00:00 | |
Think about this some more ... | 01/01/70 00:00 |