LECTURE 6-7 - LECTURE 6-7. FREQUENCY RESPONSE AND SYSTEM...

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LECTURE 6-7. FREQUENCY RESPONSE AND SYSTEM CONCEPTS MAE307 Applied Electronics © Inkyu Park, 2010 Instructor: Prof. Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST)
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Outline - Sinusoidal Frequency Response - Fourier Analysis - Filters Low-Pass High-Pass Band-Pass - Bode-Plots MAE307 Applied Electronics © Inkyu Park, 2010
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Sinusoidal Frequency Response A measure of the variation of a load-related voltage or current as a function of the frequency of the excitation signal. How an electrical system responses to the input signals with multiple components at various frequencies. Electrical System Input Signal Output Signal Component #1 omponent #1 omponent #2 MAE307 Applied Electronics © Inkyu Park, 2010 Component #2 Component #3 Component #4 Component #1 Component #3 Component #2 Component #4 Each frequency component of input signal has different effect on that of output signal (amplitude amplification, phase shift)
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Sinusoidal Frequency Response : Why is it important ? Example 1: Robot control MAE307 Applied Electronics © Inkyu Park, 2010
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Sinusoidal Frequency Response : Why is it important ? Example 2: MEMS Piezoelectric RF resonator for mobile phones MAE307 Applied Electronics © Inkyu Park, 2010 fc =236.2 MHz BW 3dB=647 kHz I.L.= -7.9 dB 20dB S.F.= 2.79 1kΩ Termination Rejection 26 dB
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Sinusoidal Frequency Response We use the general formula to describe the frequency response (transfer fn). This phasor form can be rewritten as MAE307 Applied Electronics © Inkyu Park, 2010 Thus, the amplitude and phase of the output signal are
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Sinusoidal Frequency Response : Example Compute the frequency response ) ( ω j H V First find the equivalent circuit for the source: hen, the load voltage is MAE307 Applied Electronics © Inkyu Park, 2010 Then, the load voltage is Then, the frequency response is
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Sinusoidal Frequency Response : Example H(jω) V S (jω) I S V L I L There are various kinds of gain: MAE307 Applied Electronics © Inkyu Park, 2010
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This note was uploaded on 11/21/2010 for the course MECHANICAL mae302 taught by Professor Jang during the Spring '10 term at Seoul National.

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LECTURE 6-7 - LECTURE 6-7. FREQUENCY RESPONSE AND SYSTEM...

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