LMV721-N, LMV722-N

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SNOS414I – AUGUST 1999 – REVISED AUGUST 2013

Figure 31. Simple Low-Pass Active Filter

(5)

Figure 32. Frequency Response of Simple Low-pass Active Filter in Figure 31

Note that the single-op-amp active filters are used in to the applications that require low quality factor, Q(

≤ 10),

low frequency (

≤ 5KHz), and low gain (≤ 10), or a small value for the product of gain times Q(≤ 100). The op amp

should have an open loop voltage gain at the highest frequency of interest at least 50 times larger than the gain

of the filter at this frequency. In addition, the selected op amp should have a slew rate that meets the following

requirement:

Slew Rate

where

•

•

Figure 33. A Battery Powered Microphone Preamplifier

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