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OPA2690 Datasheet(PDF) 18 Page - Burr-Brown (TI) |
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OPA2690 Datasheet(HTML) 18 Page - Burr-Brown (TI) |
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18 / 31 page  www.ti.com HIGH-FREQUENCY ACTIVE FILTERS 9 6 3 0 -3 -6 -9 -12 -15 -18 -21 -24 1 10 100 1000 Frequency(MHz) 1/3 OPA3693 +5V -5V 50W 50W 22pF 226W 100W 0W Source R G 300W R F 300W 22pF V I V O OPA3693 SBOS353 – DECEMBER 2006 This type of filter depends on a low output impedance from the amplifier through very high The extremely wide bandwidth of the OPA3693 frequencies to continue to provide an increasing allows a wide range of active filter topologies to be attenuation with frequency. As the amplifier output implemented with minimal amplifier bandwidth impedance rises with frequency, any input signal or interaction in the filter shape. Sallen-Key filters, for noise starts to feed directly through to the output via example, using either a gain of +1V/V or gain of the feedback capacitor. Because the OPA3693 used +2V/V amplifier, may be easily implemented with no in Figure 49 has a 650MHz bandwidth, the active external gain setting elements. In general, given a filter continues to rolloff through frequencies desired filter ω O, the amplifier should have at least exceeding 200MHz. Figure 50 shows the frequency 20X that ω O to minimize filter interaction with the response for the filter of Figure 49, where the desired amplifier frequency response. Figure 49 illustrates an 40MHz cutoff is achieved and a 40dB/dec roll-off is example gain of +2 line driver using the OPA3693 held through very high frequencies. that incorporates a 40MHz low-pass Butterworth response with just a few external components. The filter resistor values have been adjusted slightly here from an ideal filter analysis to account for parasitic effects. Figure 50. 40MHz Low-Pass Active Filter Response Figure 49. Line Driver with 40MHz Low-Pass Active Filter 18 Submit Documentation Feedback |
Similar Part No. - OPA2690 |
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Similar Description - OPA2690 |
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