> On 25-Jan-11 13:06, V G wrote:
> > @Olin, note: in this circuit (
> > http://www.eng.utah.edu/~jnguyen/ecg/bigsch.gif), they seem to have mad=
e
> > their own instrumentation amplifier that looks like this
> > http://www.allaboutcircuits.com/vol_3/chpt_8/10.html.
>=20
>=20
>      I have designed an EMG using the Analog Devices AD620
> instrumentation amplifier feeding a National Instruments ADCS7476
> controlled by an ATMEGA128 processor.
>=20
>      The AD620 are not cheap but has all differential circuits inside.
>=20
>      Mark Jordan

I have been involved in heart monitoring as well, I didn't get to design it=
, but took over some work when a guy left the company. It used three CA3078=
 op amps for the electrode inputs in an IA configuration, to get enough vol=
tage swing to NBFM modulate an RF signal at ~160MHz IIRC. Worked quite well=
 as far as it went, but it never made it to commercial production unfortuna=
tely.
--=20
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