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OP285GSZ-REEL Folha de dados(PDF) 11 Page - Analog Devices |
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OP285GSZ-REEL Folha de dados(HTML) 11 Page - Analog Devices |
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11 / 16 page  REV. A OP285 –11– A 3-Pole, 40 kHz Low-Pass Filter The closely matched and uniform ac characteristics of the OP285 make it ideal for use in GIC (Generalized Impedance Converter) and FDNR (Frequency Dependent Negative Resistor) filter appli- cations. The circuit in Figure 16 illustrates a linear-phase, 3-pole, 40 kHz low-pass filter using an OP285 as an inductance simulator (gyrator). The circuit uses one OP285 (A2 and A3) for the FDNR and one OP285 (Al and A4) as an input buffer and bias current source for A3. Amplifier A4 is configured in a gain of 2 to set the pass band magnitude response to 0 dB. The benefits of this filter topology over classical approaches are that the op amp used in the FDNR is not in the signal path and that the filter’s performance is relatively insensitive to compo- nent variations. Also, the configuration is such that large signal levels can be handled without overloading any of the filter’s internal nodes. As shown in Figure 17, the OP285’s symmetric slew rate and low distortion produce a clean, well-behaved transient response. 10 90 100 0% SCALE: VERTICAL – 2V/ DIV HORIZONTAL – 10 S/ DIV VOUT 10V p-p 10kHz Figure 17. Low-Pass Filter Transient Response VIN 3 2 1 A1 A1, A4 = 1/2 OP285 A2, A3 = 1/2 OP285 1 A2 2 3 R1 95.3k C1 2200pF R2 787 C2 2200pF R3 1.82k C3 2200pF R4 1.87k R5 1.82k A3 5 7 6 A4 5 7 6 R6 4.12k R7 100k R9 1k VOUT R8 1k C4 2200pF Figure 16. A 3-Pole, 40 kHz Low-Pass Filter Driving Capacitive Loads The OP285 was designed to drive both resistive loads to 600 Ω and capacitive loads of over 1000 pF and maintain stability. While there is a degradation in bandwidth when driving capacitive loads, the designer need not worry about device stability. The graph in Figure 18 shows the 0 dB bandwidth of the OP285 with capacitive loads from 10 pF to 1000 pF. 0 0 CLOAD – pF 200 400 600 800 1000 1 2 3 4 5 6 7 8 9 10 Figure 18. Bandwidth vs. CLOAD |
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