Difference between revisions of "EMG3"
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Gain and filters sections: | Gain and filters sections: | ||
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*instrumentation amp with gain of 25, referenced to common | *instrumentation amp with gain of 25, referenced to common | ||
| − | ==first output stage | + | ==first output stage (01) == |
*16 Hz high pass | *16 Hz high pass | ||
*300 Hz, 2nd order active LP with gain of 10.5 | *300 Hz, 2nd order active LP with gain of 10.5 | ||
*stage output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain 262x | *stage output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain 262x | ||
| − | ==2nd output stage | + | ==2nd output stage (02) == |
*output of 2nd order LP goes to 16 Hz high pass | *output of 2nd order LP goes to 16 Hz high pass | ||
*followed by gain of 11 amplifier | *followed by gain of 11 amplifier | ||
*state output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain ~2900x - resulting in +-9V EMG signals. | *state output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain ~2900x - resulting in +-9V EMG signals. | ||
Revision as of 08:19, 20 February 2007
Gain and filters sections:
front end
- subject protection is via 100K resistors on the 3 signals
- 3.3KHz differential filter, 16KHz common mode filter
- instrumentation amp with gain of 25, referenced to common
first output stage (01)
- 16 Hz high pass
- 300 Hz, 2nd order active LP with gain of 10.5
- stage output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain 262x
2nd output stage (02)
- output of 2nd order LP goes to 16 Hz high pass
- followed by gain of 11 amplifier
- state output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain ~2900x - resulting in +-9V EMG signals.
