There are two parts to this instrumentation amplifier, so the gain is split among them noted as K1 and K2. For example if you provide 1V as I did the output should be 1000V. Which means that whatever the input voltage you supply this part of the circuit will 'amplify' this by the gain value. The values in the picture were determined by having a desired gain of 1000. First is to determine values for the instrumentation amplifier (see picture).I used PSpice so that is what I'll be explaining the details for but the component values (resistors, capacitors, etc.) and the main take aways are all the same so feel free to use something else (such as ). You can use whatever software you have available to simulate the circuit we will be creating. Overall, an input cardiac signal and human signal should be able to be successfully amplified and filtered, simulating an ECG using circuit skills to design, modify, and test an instrumentation amplifier, notch filter, and low pass filter circuit. Both the simulated waveform and human cardiac signal may be ran through LabVIEW in order to count beats per minute (BPM) of the input signal. After, a human ECG signal may be inputted through the ECG and LabVIEW. After successfully testing each component individually, a cardiac signal can be inputted through a completed circuit consisting of the instrumentation amplifier, notch filter, and low pass filter. To ensure that each component is correctly amplifying or filtering signal, an AC sweep can be performed using PSpice and experimentally. These components were created physically and on a circuit simulator. To successfully simulate an ECG reading, input cardiac signals need to be amplified (instrumentation amplifier) and filtered (notch and low pass filters). You will need basic knowledge of circuits and and few instruments to implement the entirety of this instructable.Įlectrocardiography (ECG or EKG) is a painless, non-invasive test that records the electrical activity of the heart and is used to gain insight on the state of the patient’s heart. This instructable is a guided way to simulated, build, and test a circuit that takes in, filters, and amplifies ECG signals. If using this circuit for real ECG measurements, please ensure the circuit and the circuit-to-instrument connections are utilizing proper isolation techniques. This is for educational purposes only using simulated signals.
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