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LM2902VDG Datasheet(PDF) 9 Page - ON Semiconductor |
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LM2902VDG Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 16 page LM324, LM324A, LM224, LM2902, LM2902V, NCV2902 http://onsemi.com 9 2 1 For less than 10% error from operational amplifier, If source impedance varies, filter may be preceded with voltage follower buffer to stabilize filter parameters. where fo and BW are expressed in Hz. Qo fo BW < 0.1 Given:fo =center frequency A(fo)=gain at center frequency Choose value fo, C Then: R3 = Q p fo C R3 R1 = 2 A(fo) R1 R3 4Q2 R1 − R3 R2 = + − + − Vref =VCC Vref f = R1 + RC 4 CRf R1 R3 = R2 R1 R2 + R1 R2 300 k 75 k R3 R1 100 k C Triangle Wave Output Square Wave Output Vin Rf if Vref 1/4 LM324 1/4 LM324 Figure 16. Function Generator Figure 17. Multiple Feedback Bandpass Filter Vref =VCC 1 2 − + VCC R3 R1 R2 Vref C C VO CO = 10 C CO 1/4 LM324 |
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