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ecse291_lab_notes

# ecse291_lab_notes - =(T L*ln(2 Frequency response –...

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Transfer function Solve : H(jw) = Vo/Vi Definition : A transfer function is a mathematical expression of the relationship between the input signal and output signal of a system. Frequency response – magnitude Solve : |Vo|/|Vi| (using Mean CH1 – Mean CH2 on screen) Definition : The frequency response of a system is a curve showing how well the system passes various frequencies. A filter is characterized by the shape of its frequency response. Frequency response – phase Solve : (d/T) * 360 Definition : The time expressed in degrees between the same reference point on two periodic waveforms. Time constant If the half-life time of the current (voltage across the resistor) is measured, the time- constant can be calculated using the relation [(t 1/2
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Unformatted text preview: ) = (T L )*ln(2)] Frequency response – cutoff frequency Solve : [SEE PAGE 7 IN EXPERIMENT 5 NOTES] Definition : In a filter, the cutoff frequency is the point where the response is 3 dB down in amplitude from the level of the passband. Beyond the cutoff frequency, the filter will attenuate all other frequencies, depending on the design of the filter. Frequency response – quality factor (only used for bandpass) Solve : Q = f o / (f 2 – f 1 ) Definition : A measure of the sharpness of resonance or frequency selectivity of a resonant vibratory system having a single degree of freedom, either mechanical or electrical. For plotting on logarithmic paper, use: 20 log 10 |H(jw)| (result in dB – decibels)...
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