BIOE415.2 - Introduction

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Introduction This lab integrates the usage of both active and passive filters (low-pass, band-pass, and high- pass). The filters were observed to attenuate different signals at different frequencies. This is  important in instrumentation because the real values and ideal values may differ vastly due to  interference signals. The signal of interest may be concealed by the amplification of  interference. Methods The following filters were built with the circuit values indicated below. Passive Low-Pass Filter Passive High-Pass Filter Active Band-Pass Filter
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Active Low-Pass Filter In our lab protocol, we had to adjust some of the values of the circuit elements.  We used a 1.01  V, 226 Hz sinusoidal wave as the input to our active filters. Our cutoff frequencies in 3.2.2 were  only measured to 0.2 Hz, instead of the prescribed 0.05 Hz. In 3.3.3, our differential input was  195 Hz at 100 mV.  Results 3.1.2 Interference Interference signals were measured by hooking up two wires to the oscilloscopes. We  measured peak to peak voltage for the following frequencies: 60Hz, 120Hz, and 20 kHz. The  respective frequencies were 50 mV for the first two listed frequencies and 120 mV at 20 kHz.  The 100 MHz frequency could not be obtained. 3.1.3 Spectrum Analyzer
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This note was uploaded on 02/09/2010 for the course MSE 518248 taught by Professor Cahler during the Spring '10 term at University of Balamand.

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BIOE415.2 - Introduction

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