The electrocardiogram
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The electrocardiogram. Op-amps, instrumentation amps, filters. This is your data. V ( arb ). Time (sec). EKG. The EKG is a powerful diagnostic tool. Regularly used by cardiologists. . Disclaimers. We are not real doctors. Neither are you. Do not try to interpret your EKG. . Safety.

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The electrocardiogram

The electrocardiogram

Op-amps, instrumentation amps, filters


This is your data
This is your data

V (arb)

Time (sec)


EKG

The EKG is a powerful diagnostic tool. Regularly used by cardiologists.


Disclaimers
Disclaimers

  • We are not real doctors. Neither are you. Do not try to interpret your EKG.



Safety1
Safety

  • We will review this in lab, but basically

    • 100 K resistors between you and breadboard.

    • Unplug your laptop while collecting data.


Privacy
Privacy

  • Your EKG could be considered private medical information under Federal HIPAA laws.

  • If using this data makes you at all uncomfortable – then use one of the instructors as your subject.


The circuit
The circuit

AD623 – Instrumentation amplifier




The op amp f ollower
The op-amp follower



Simplification for op amp circuit analysis
Simplification for op-amp circuit analysis

  • If the op-amp is wired with negative feedback, and -

  • Changes are “slow” (less than ~100 kHz), then –

    • Assume no current flow through into the inputs.

    • The two input voltages are equal.






Ad623
AD623

Data sheet



I mpedance z general form of ohm s law v i z
Impedance (Z)General form of Ohm’s Law V = I Z

Example: capacitor


Rc circuit via impedances
RC circuit (via impedances)

Voltage divider

Vout


Do you remember how to plot vout vin
Do you remember how to plot Vout/Vin ?

w = logspace(0,4,100);

j = sqrt(-1);

R = 10e3;

C = 1e-6;

Z1 = R;

Z2 = 1./(j*w*C);

loglog(w,abs(Z2./(Z1+Z2)));


Resistors in series and parallel
Resistors in series and parallel

Impedances in series:

Impedances in parallel:

Can you derive these relationships?




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