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TS616 数据表(PDF) 29 Page - STMicroelectronics |
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TS616 数据表(HTML) 29 Page - STMicroelectronics |
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29 / 37 page ![]() TS616 Choosing the feedback circuit 29/37 9.1 The bias of an inverting amplifier A resistance is necessary to achieve good input biasing, such as resistance R, shown in Figure 66. The magnitude of this resistance is calculated by assuming the negative and positive input bias current. The aim is to compensate for the offset bias current, which could affect the input offset voltage and the output DC component. Assuming Ib-, Ib+, Rin, Rfb and a zero volt output, the resistance R is: R = Rin // Rfb Figure 66. Compensation of the input bias current 9.2 Active filtering Figure 67. Low-pass active filtering - Sallen-Key From the resistors Rfb and RG, we can directly calculate the gain of the filter in a classic non- inverting amplification configuration: We assume the following expression as the response of the system: R Load Output Rfb Rin Ib- Ib+ Vcc+ Vcc- TS616 + _ R Load Output Rfb Rin Ib- Ib+ Vcc+ Vcc- TS616 + _ + _ RG IN Rfb 910 Ω TS616 25 Ω OUT R1 R2 C2 C1 + _ RG IN Rfb 910 Ω TS616 25 Ω OUT R1 R2 C2 C1 A V g1 R fb R g -------- + == T j ω Vout j ω Vin j ω ----------------- g 12 ζ j ω ω c ----- j ω () 2 ω c 2 ------------ ++ ----------------------------------------- == |
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