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AD8009ART Scheda tecnica(PDF) 9 Page - Analog Devices |
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AD8009ART Scheda tecnica(HTML) 9 Page - Analog Devices |
9 / 12 page AD8009 –9– REV. B FREQUENCY – MHz 10 1000 100 8 7 6 5 4 –1 3 2 1 0 12 9 6 3 0 –15 –12 –9 –6 –3 50 V IN CA 499 V OUT = 200mV p–p V OUT 499 100 CA = 0pF 1 dB/div CA = 1pF 1 dB/div CA = 2pF 3 dB/div 1 Figure 34. Small Signal Frequency Response vs. Parasitic Capacitance 1.5ns 40mV VOUT = 200mV p–p VS = 5V CA = 2pF CA = 1pF CA = 0pF 499 100 50 V OUT V IN CA 499 Figure 35. Small Signal Pulse Response vs. Parasitic Capacitance 10 F AD8009 HP8753D 49.9 301 49.9 +5V –5V 301 2 10 F + ZOUT = 50 ZIN = 50 + 0.001 F 0.1 F 0.001 F 0.1 F 3 7 4 6 WAVETEK 5201 BPF Figure 36. AD8009 Driving a Bandpass RF Filter CENTER 50.000 MHz SPAN 80.000 MHz 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 AD8009 G = 2 RF = RG= 301 DRIVING WAVETEK 5201 TUNABLE BPF fC = 50MHz Figure 37. Frequency Response of Bandpass Filter Circuit APPLICATIONS All current feedback op amps are affected by stray capacitance on their –INPUT. Figures 34 and 35 illustrate the AD8009’s response to such capacitance. Figure 34 shows the bandwidth can be extended by placing a capacitor in parallel with the gain resistor. The small signal pulse response corresponding to such an increase in capacitance/ bandwidth is shown in Figure 35. As a practical consideration, the higher the capacitance on the –INPUT to GND, the higher RF needs to be to minimize peaking/ringing. RF Filter Driver The output drive capability, wide bandwidth and low distortion of the AD8009 are well suited for creating gain blocks that can drive RF filters. Many of these filters require that the input be driven by a 50 Ω source, while the output must be terminated in 50 Ω for the filters to exhibit their specified frequency response. Figure 36 shows a circuit for driving and measuring the frequency response of a filter, a Wavetek 5201 Tunable Band Pass Filter that is tuned to a 50 MHz center frequency. The HP8753D network provides a stimulus signal for the measure- ment. The analyzer has a 50 Ω source impedance that drives a cable that is terminated in 50 Ω at the high impedance nonin- verting input of the AD8009. The AD8009 is set at a gain of two. The series 50 Ω resistor at the output, along with the 50 Ω termination provided by the filter and its termination, yield an overall unity gain for the measured path. The frequency response plot of Figure 37 shows the circuit to have an insertion loss of 1.3 dB in the pass band and about 75 dB rejection in the stop band. |
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