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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD820 датащи(PDF) 20 Page - Analog Devices |
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AD820 датащи(HTML) 20 Page - Analog Devices |
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20 / 24 page  AD820 Rev. E | Page 20 of 24 LOW POWER 3-POLE SALLEN KEY LOW-PASS FILTER The high input impedance of the AD820 makes it a good selection for active filters. High value resistors can be used to construct low frequency filters with capacitors much less than 1 μF. The AD820 picoamp level input currents contribute minimal dc errors. Figure 46 shows an example, a 10 Hz 3-pole Sallen Key filter. The high value used for R1 minimizes interaction with signal source resistance. Pole placement in this version of the filter minimizes the Q associated with the 2-pole section of the filter. This eliminates any peaking of the noise contribution of resistors R1, R2, and R3, thus minimizing the inherent output voltage noise of the filter. AD820 – + +VS –VS 0.01µF 0.01µF VOUT 3 2 4 7 6 – + R3 243kΩ C3 0.022µF – + VIN R2 243kΩ R1 243kΩ C1 0.022µF C2 0.022µF 0 –100 0.1 1k FREQUENCY (Hz) 110 100 –10 –20 –30 –40 –50 –60 –70 –80 –90 Figure 46. 10 Hz Sallen Key Low-Pass Filter |
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