Datasheet

LM148-N, LM248-N, LM348-N
www.ti.com SNOSBT2E –MAY 1999–REVISED MARCH 2013
Figure 24. A 3 Amplifier Bi-Quad Notch Filter
Ex: f
NOTCH
= 3 kHz, Q = 5, R1 = 270k, R2 = R3 = 20k, R4 = 27k, R5 = 20k, R6 = R8 = 10k, R7 = 100k, C1 = C2 =
0.001 μF
Better noise performance than the state-space approach.
Figure 25. A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros)
R1C1 = R2C2 = t
R′1C′1 = R′2C′2 = t′
f
C
= 1 kHz, f
S
= 2 kHz, f
p
= 0.543, f
Z
= 2.14, Q = 0.841, f′
P
= 0.987, f′
Z
= 4.92, Q′ = 4.403, normalized to ripple BW
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Product Folder Links: LM148-N LM248-N LM348-N