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AD8009JRTZ-REEL7 Arkusz danych(PDF) 11 Page - Analog Devices |
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AD8009JRTZ-REEL7 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 16 page –11– REV. F AD8009 10 F AD8009 HP8753D 49.9 301 49.9 +5V –5V 301 3 10 F + ZOUT = 50 ZIN = 50 + 0.001 F 0.1 F 0.001 F 0.1 F 2 7 4 6 WAVETEK 5201 BPF TPC 37. AD8009 Driving a Band-Pass 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 TPC 38. Frequency Response of Band-Pass Filter Circuit APPLICATIONS All current feedback op amps are affected by stray capacitance on their –INPUT. TPCs 35 and 36 illustrate the AD8009’s response to such capacitance. TPC 35 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/band- width is shown in TPC 36. 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. TPC 37 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 measurement. The analyzer has a 50 Ω source impedance that drives a cable that is terminated in 50 Ω at the high impedance noninverting input of the AD8009. The AD8009 is set at a gain of +2. 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 TPC 38 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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