On Wed, Mar 9, 2011 at 3:32 AM, N. T. <ntypesemi@gmail.com> wrote:

> Yes, I over-truncated the specs, my mistake..
> ---
> The LTC2053 is a high precision instrumentation amplifier. The CMRR is
> typically 116dB with a single or dual
> 5V supply and is independent of gain. The input offset voltage is
> guaranteed below 10=B5V with a temperature
> drift of less than 50nV/=B0C
> ---
> The LT1168 is laser trimmed for very low input offset voltage (40=B5V
> max), drift (0.3=B5V/=B0C)
> ---
>
> VG wrote: "The output from my ECG (instrumentation amplifier) has
> somewhat of a DC bias to it." I believe he meant that the mean value
> of the output waveform is not close enough to 0. The reason, I think,
> is input offset voltage and temperature drift.
>
> LTC2053 input offset voltage is below 10=B5V with a temperature drift of
> less than 50nV/=B0C
> LT1168 input offset voltage is 40=B5V max, drift is 0.3=B5V/=B0C.
>
> That's why I suggested using LTC2053 instead of LT1168.
>
>
I mean, for some reason, with the electrodes not connected to anything, I
see a steady DC signal of 2V or so for some reason.
--=20
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