WA II (Application Note) - Low-Pass Shelving Filters -...

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Low-Pass Shelving Filters - Application Note - Kirk Poucher ECE 3041, L03 July 20, 2006
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Introduction Analog filters are among the most widely utilized electronic circuit components in use today. These simple circuit elements allow us to manipulate and process electrical signals and many ways which allow most of our electrical devices function. The function of an analog filter is to allow, reject, or attenuate certain signal frequencies, while leaving others unchanged. The most common filters are the Low-Pass, High-Pass, Band-Pass, Band-Reject, Low-Pass Shelving, High-Pass Shelving, and All-Pass filters. The frequency responses for these simple filters are shown in Figure 1. 2 Figure 1. Frequency Response for Different First-Order Filters
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As one can infer from the plots, each of these filters has certain frequencies where the slope of the plots changes. These frequencies are chosen and manipulated by the circuit designer, through the choice of resistor and capacitor values. The values of the filter gain, K, can also be calculated by use of the circuit’s transfer function, denoted |T( )|. Figure 2 shows a
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This note was uploaded on 01/17/2011 for the course ECE 3040 taught by Professor Hamblen during the Fall '07 term at Georgia Institute of Technology.

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WA II (Application Note) - Low-Pass Shelving Filters -...

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