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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LMV771 датащи(PDF) 16 Page - National Semiconductor (TI) |
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LMV771 датащи(HTML) 16 Page - National Semiconductor (TI) |
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16 / 21 page  Application Note (Continued) STATE VARIABLE ACTIVE FILTER State variable active filters are circuits that can simulta- neously represent high pass, band pass, and low pass fil- ters. The state variable active filter uses three separate amplifiers to achieve this task. A typical state variable active filter is shown in Figure 9. The first amplifier in the circuit is connected as a gain stage. The second and third amplifiers are connected as integrators, which means they behave as low pass filters. The feedback path from the output of the third amplifier to the first amplifier enables this low frequency signal to be fed back with a finite and fairly low closed loop gain. This is while the high frequency signal on the input is still gained up by the open loop gain of the 1st amplifier. This makes the first amplifier a high pass filter. The high pass signal is then fed in to a low pass filter. The outcome is a band pass signal, meaning the second amplifier is a band pass filter. This signal is then fed into the third amplifiers input and so the third amplifier behaves as a simple low pass filter. The transfer function of each filter needs to be calculated. The derivations will be more trivial if each stage of the filter is shown on its own. The three components are: 20039680 20039681 For A 1 the relationship between input and output is: 20039662 FIGURE 8. 20039674 FIGURE 9. www.national.com 16 |
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