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MC3303 데이터시트(PDF) 7 Page - STMicroelectronics |
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MC3303 데이터시트(HTML) 7 Page - STMicroelectronics |
7 / 11 page 1/4 MC3403 eo V CC C O C O = 10C C R3 R2 R1 e I V(ref) V(ref) 1 2 V CC = C Given fo = Center frequency ; choose values fo, C then R3 = Q πfoC • A (fo) = Gain at center frequency R1 = R3 2A ( fo ) • R2 = R1 R5 4Q 2 R1 − R5• For less than 10% error from operational amplifier Qofo BW < 0.1 where fo and BW are expressed in Hz If source impedance varies, filter may be preceded with voltage follower buffer to stabilize filter parameters MULTIPLE FEEDBACK BANDPASS FILTER 1/4 MC3403 V(ref) V(ref) 1 2 V CC = Triangle wave output C 1/4 MC3403 R2 300k Ω Square wave output R3 75k Ω R1 100k Ω V(ref) R1 + R2 4 CR R1 f = f if R3 = R2 R1 R2 + R1 R f APPLICATION INFORMATION (continued) FUNCTION GENERATOR MC3303 - MC3403 - MC3503 7/11 |
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