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Tuesday, October 20, 2009

There are many ways to construct Low pass filter. In this schematic, we shall consider some of circuits when we using to current. This is the simplest of Low Pass Filter. This circuit can called Multiple Feedback circuit. Why? Because of the two of feedback paths through C1 and R2, and because of this op amp is serving as an infinite gain device rather than a finite gain device.

Because of its relative simplicity, the MFB filter is one of the more popular inverting gain types. Is also has the advantages of good stability characteristics and low output impedance. Thus it can be readily cascaded with other sections to form a higher order filter. A disadvantages of the circuit is that it cannot attain a high pole pair quality factor without large spreads of element values and high sensitivities to changes in the element values

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