I have a question regarding the driven right leg part circuit depicted in your ECG-circuit of your LT1168 or LT1920 datasheets.
I understand this circuit so: C1 in the feedback path together with R3/R4 (15k) forms an integrator that attenuates the input common mode signal
with increasing frequency. R2 in the feedback is for a stable biasing by restoring feedback at DC (where the circuit behaves like a high-gain inv. ampl.)
What does "POLE AT 1kHz" mean? Is that the "cutoff" frequency of the integrator? How is it calculated? Is this correct?:
1/(2π*((R3*R4)/(R3+R4))*C1) = 1061 Hz ?
What does then R1 do next C1? What is its purpose?
[edited by: pauledd at 6:42 AM (GMT 0) on 24 May 2019]