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全差分MFB滤波器Texas Instruments Incorporated Amplifiers: Op Amps
Using the infinite-gain, MFB filter topology
in fully differential active filters
By Thomas Kuehl
Senior Applications Engineer
Active filters are commonly employed in analog signal- The Sallen-Key and infinite-gain, multiple-feedback
conditioning applications. Some of the more common appli (MFB) filter topologies are well-documented in filter liter-
cations include tailoring a signal’s bandwidth to reduce ature, books, and on-line resources. Their popularity may
noise. One example of this is a low-pass anti-aliasing filter stem from the fact that they require only one operational
in front of an analog-to-digital converter (A
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