Datasheet

LM146, LM346
SNOSBH5B –MAY 2004–REVISED SEPTEMBER 2004 www.ti.com
Ex: f
c
= 20 kHz, H
o
(gain of the filter) = 1, Q
01
= 0.541, Q
o2
= 1.306.
•Since for this filter the GBW product of all 4 amplifiers has been designed to be the same (∼1 MHz) only one current
source can be used to bias the circuit. Fine tuning can be further accomplished through R
b
.
Figure 38. A 4th Order Butterworth Low Pass Capacitorless Filter
Miscellaneous Applications
• For better performance, use a matched NPN pair.
Figure 39. A Unity Gain Follower with Bias Current Reduction
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