Difference between revisions of "EMG3"
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| + | ==Gain and filters sections:== | ||
| − | + | ===Front End=== | |
| − | |||
| − | === | ||
*subject protection is via 100K resistors on the 3 signals | *subject protection is via 100K resistors on the 3 signals | ||
*3.3KHz differential filter, 16KHz common mode filter | *3.3KHz differential filter, 16KHz common mode filter | ||
*instrumentation amp with gain of 25, referenced to common | *instrumentation amp with gain of 25, referenced to common | ||
| − | == | + | ==1st 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 | ||
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==2nd output stage (02) == | ==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 | + | *followed by gain of 48 amplifier (actual gain is 48 not 11x) |
| − | * | + | *stage output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain ~12,600- resulting in +-9V EMG signals. |
Latest revision as of 08:30, 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
1st 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 48 amplifier (actual gain is 48 not 11x)
- stage output through 2K resistor and 800 Hz LP. 0.1uF bypass across output. Total gain ~12,600- resulting in +-9V EMG signals.
