LM346M datasheet(16/24 Pages) NSC

No. de pieza	LM346M

Descripción Electrónicos	LM146/LM346 Programmable Quad Operational Amplifiers

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Fabricante Electrónico	NSC [National Semiconductor (TI)]

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16 / 24 page

LM146, LM346

SNOSBH5B – MAY 2004 – REVISED SEPTEMBER 2004

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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 (

∼1 MHz) only one current

source can be used to bias the circuit. Fine tuning can be further accomplished through Rb.

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

16

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