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    The Sallen-Key Low-Pass Filter

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    venkat
    The Sallen-Key low-pass filter uses a voltage-controlled voltage source configuration with a capacitor providing feedback to shape the response near the passband edge. It is a second-order filter whose critical frequency can be expressed as the reciprocal of the product of the resistor and capacitor values when those components are set to be equal. The damping factor depends on the ratio of the two resistors and determines the type of response, such as Butterworth, Chebyshev or Bessel.

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    The Sallen-Key Low-Pass Filter

    Uploaded by

    venkat
    76 views10 pages
    The Sallen-Key low-pass filter uses a voltage-controlled voltage source configuration with a capacitor providing feedback to shape the response near the passband edge. It is a second-order filter whose critical frequency can be expressed as the reciprocal of the product of the resistor and capacitor values when those components are set to be equal. The damping factor depends on the ratio of the two resistors and determines the type of response, such as Butterworth, Chebyshev or Bessel.

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    Active filters

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    Active filtters

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    The Sallen-Key low-pass filter uses a voltage-controlled voltage source configuration with a capacitor providing feedback to shape the response near the passband edge. It is a second-order filter whose critical frequency can be expressed as the reciprocal of the product of the resistor and capacitor values when those components are set to be equal. The damping factor depends on the ratio of the two resistors and determines the type of response, such as Butterworth, Chebyshev or Bessel.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    76 views10 pages

    The Sallen-Key Low-Pass Filter

    Uploaded by

    venkat
    The Sallen-Key low-pass filter uses a voltage-controlled voltage source configuration with a capacitor providing feedback to shape the response near the passband edge. It is a second-order filter whose critical frequency can be expressed as the reciprocal of the product of the resistor and capacitor values when those components are set to be equal. The damping factor depends on the ratio of the two resistors and determines the type of response, such as Butterworth, Chebyshev or Bessel.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
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    The Sallen-Key Low-Pass Filter

    The Sallen-Key is one of the most common configurations for a second-order (two-pole)
    filter. It is also known as a VCVS (voltage-controlled voltage source) filter. A low-pass
    version of the Sallen-Key filter is shown in Figure 15–10(assuming a Butterworth
    characteristic) A unique feature of the Sallen-Key low-pass filter is
    the capacitor CA that provides feedback for shaping the response near the edge of the
    passband. The critical frequency for the Sallen-Key filter is
    The component values can be made equal so that RA = RB = R , CA = CB = C In this
    case, the expression for the critical frequency simplifies to
    as in the single-pole filter. As you
    have learned, the damping factor is set by the values of R1 and R2
    thus making the filter response either Butterworth, Chebyshev, or Bessel. For example, from
    Table 15–1, the ratio R1/R2 must be 0.586 to produce the damping factor of 1.414 required for
    a second-order Butterworth response.

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