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ECG analog front end (INA128 op amp)

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houly

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ECG analog front end

Hi all
I'm interresting in relaslization of an ECG circuit. I found application that use instrumentation amplifier but i'm not familiar whith the sort of injection of voltage on the body. What is it ? why does is it necessary to do this ?

regards

here is an extract of the INA128 op amp datasheet.
 

Hi,
Pls consult such other engaged appl. notes too.
It is a referencing/guarding only, than you has very low level signals...
Some literature from Keithley can help for you too; although is wroten "only" generally for low(est) level sensing. http://www.keithley.eu.com, 6thEdition, "Low Level Measurements" Precision DC U/I & R measurements...
You can it on-line order with 2 other good books tooo.
K.
 

    H

    houly

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Active driven guard is not particularly required in ECG due to the limited frequency range and fair source impedance.
Common mode feedback respectively 3-electrode configuration is commonly used in ECG applications, as far as I know. It's also
a "serial" topic at edaboard. Apart from avoiding common mode overload of the input amplifier, it also reduces interferences
from power supply system. But ECG is your business rather than mine I guess, you should know the respective literature.
 

    H

    houly

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you need to start to read some books, how about from this onword...

**broken link removed**
 

    H

    houly

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hello,
thanks a lot for your replies, I'm not familiar with the reference/guarding
thanks for the link and reference book.
 

:)
Your welcome!
If you think, press down on "helped" pls.
K.
 

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