BME 310 Lab 1.docx

# Electric networks are often used for signal

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Electric networks are often used for signal processing. One physical signal that is often processed by such networks is the potential difference between two points in the network. An alternative signal could be the current carried through a branch of a network. The input signal sent to the signal processing network in this lab is produced by a signal generator. The output signal is recorded by a digital oscilloscope. The system of the breadboard with all its configurations is seen below: Questions: 2. τ RC = 33000 0.047 × 10 6 = 1.55 × 10 3 s

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BME 310 Biomedical Computing LAB 1 October 5, 2015 3. f c = 1 2 π τ RC = 102.68 Hz ω = 1 τ RC = 644.75 rad s 4. When varying the frequency, we see a different output in the signal generated, sometimes the amplitude of the waves is taller, and sometimes the amplitude of the waves is shorter. Because this system is a low-pass filter, it ONLY allows frequencies below the critical frequency to pass. At frequencies above the critical frequency, we should not see a wave on the digital oscilloscope. Part 2: In this part, we take a look at how the filter signal processor handles square, triangular, or sinusoidal signals. This was done by varying the Duty Cycle for square and triangular signals. The filter signal processor contains several elements with a “memory”. Namely, the voltage across either capacitor depends on the charge of the capacitor. The presence of these “memory” elements causes the filter signal processor to act in a more complex manner than the attenuator.

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