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LM146 数据表(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM146
功能描述  Programmable Quad Operational Amplifiers
PDF  17 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM146 数据表(HTML) 13 Page - National Semiconductor (TI)

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Active Filters Applications (Continued)
Miscellaneous Applications
DS005654-38
1. Pick up a convenient value for b; (b < 1)
2. Adjust Qo through R5
3. Adjust Ho(BP) through R4
4. Adjust fo through RSET. This adjusts the unity gain frequency (fu) of the op amp.
A 4th Order Butterworth Low Pass Capacitorless Filter
DS005654-17
Ex: fc = 20 kHz, Ho (gain of the filter) = 1, Q01 = 0.541, Qo2 = 1.306.
•Since for this filter the GBW product of all 4 amplifiers has been designed to be the same (z1 MHz) only one current source can be used to bias the circuit.
Fine tuning can be further accomplished through Rb.
A Unity Gain Follower
with Bias Current Reduction
DS005654-18
• For better performance, use a matched NPN pair.
www.national.com
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