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AD8031 Fiches technique(PDF) 14 Page - Analog Devices |
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AD8031 Fiches technique(HTML) 14 Page - Analog Devices |
14 / 16 page AD8031/AD8032 –14– REV. B APPLICATIONS A 2 MHz Single Supply Biquad Bandpass Filter Figure 42 shows a circuit for a single supply biquad bandpass filter with a center frequency of 2 MHz. A 2.5 V bias level is easily created by connecting the noninverting inputs of all three op amps to a resistor divider consisting of two 1 k Ω resistors connected between +5 V and ground. This bias point is also decoupled to ground with a 0.1 µF capacitor. The frequency response of the filter is shown in Figure 43. In order to maintain an accurate center frequency, it is essential that the op amp has sufficient loop gain at 2 MHz. This requires the choice of an op amp with a significantly higher unity gain crossover frequency. The unity gain crossover frequency of the AD8031/AD8032 is 40 MHz. Multiplying the open-loop gain by the feedback factors of the individual op amp circuits yields the loop gain for each gain stage. From the feedback networks of the individual op amp circuits, we can see that each op amp has a loop gain of at least 21 dB. This level is high enough to ensure that the center frequency of the filter is not affected by the op amp’s bandwidth. If, for example, an op amp with a gain band- width product of 10 MHz was chosen in this application, the resulting center frequency would shift by 20% to 1.6 MHz. +5V 0.1 F 0.1 F VIN R2 2k 1k 1k AD8031 C1 50pF R1 3k R3 2k +5V 0.1 F R4 2k 1/2 AD8032 R5 2k VOUT 1/2 AD8032 C2 50pF R6 1k Figure 42. A 2 MHz Biquad Bandpass Filter Using AD8031/ AD8032 1M FREQUENCY – Hz 10k 100M 100k 10M –50 0 –10 –30 –40 –20 Figure 43. Frequency Response of 2 MHz Bandpass Filter High Performance Single Supply Line Driver Even though the AD8031/AD8032 swing close to both rails, the AD8031 has optimum distortion performance when the signal has a common-mode level half way between the supplies and when there is about 500 mV of headroom to each rail. If low distortion is required in single supply applications for sig- nals that swing close to ground, an emitter follower circuit can be used at the op amp output. +5V 0.1 F 7 3 2 2N3904 200 VOUT 6 2.49k 49.9 4 10 F AD8031 VIN 2.49k 49.9 49.9 Figure 44. Low Distortion Line Driver for Single Supply Ground Referenced Signals |
Numéro de pièce similaire - AD8031 |
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Description similaire - AD8031 |
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