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# The electrocardiogram - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'The electrocardiogram' - stamos

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Presentation Transcript

### The electrocardiogram

Op-amps, instrumentation amps, filters

V (arb)

Time (sec)

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

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

• We will review this in lab, but basically

• 100 K resistors between you and breadboard.

• Unplug your laptop while collecting data.

• 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 op-amp follower

• 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.

Wikipedia

Data sheet

Impedance (Z)General form of Ohm’s Law V = I Z

Example: capacitor

Voltage divider

Vout

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)));

Impedances in series:

Impedances in parallel:

Can you derive these relationships?