LF155, LF156, LF355, LF356, LF357
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SNOSBH0C –MAY 2000–REVISED MARCH 2013
Figure 57. High Q Band Pass Filter
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By adding positive feedback (R2)
Q increases to 40
fBP = 100 kHz
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Clean layout recommended
Response to a 1Vp-p tone burst: 300μs
Figure 58. High Q Notch Filter
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2R1 = R = 10MΩ
2C = C1 = 300pF
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Capacitors should be matched to obtain high Q
fNOTCH = 120 Hz, notch = −55 dB, Q > 100
Use LF155 for
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Low IB
Low supply current
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