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TLC080CD 데이터시트(PDF) 18 Page - Texas Instruments |
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TLC080CD 데이터시트(HTML) 18 Page - Texas Instruments |
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18 / 53 page ![]() VI VO C1 + RG RF R1 f –3dB 1 2pR1C1 V O V I 1 R F R G 1 1 sR1C1 = ( + )( ) + = VI C2 R2 R1 C1 RF RG R1 = R2 = R C1 = C2 = C Q = Peaking Factor (Butterworth Q = 0.707) ( = 1 Q 2 ) RG RF _ + f –3dB 1 2pRC – = TLC080 , TLC081, TLC082 TLC083, TLC084, TLC085, TLC08xA SLOS254F – JUNE 1999 – REVISED DECEMBER 2011 www.ti.com General Configurations When receiving low-level signals, limiting the bandwidth of the incoming signals into theFigure 50 system is often required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier (see ). Figure 50. Single-Pole Low-Pass Filter If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this task. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth. Failure to do this can result in phase shift of the amplifier. Figure 51. 2-Pole Low-Pass Sallen-Key Filter 18 Submit Documentation Feedback Copyright © 1999–2011, Texas Instruments Incorporated Product Folder Link(s): TLC080 TLC081 TLC082 TLC083 TLC084 TLC085 TLC08xA |
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