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ADL5502 Datasheet(PDF) 3 Page - Analog Devices |
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ADL5502 Datasheet(HTML) 3 Page - Analog Devices |
3 / 7 page Circuit Note CN-0187 Rev. 0| Page 3 of 7 Typical measured performance characteristics of the circuit are presented in Figure 2 through Figure 5. 0.01 0.1 1 10 –25 –20 –15 –10 –5 0 5 10 15 INPUT (dBm) 450MHz 900MHz 1900MHz 2350MHz 2600MHz Figure 2. Measured VRMS Output vs. Input Level (Log Scale), 450 MHz, 900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.2 0.4 0.6 0.8 1.0 INPUT (V rms) 450MHz 900MHz 1900MHz 2350MHz 2600MHz Figure 3. Measured VRMS Output vs. Input Level (Linear Scale), 450 MHz, 900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V 0.01 0.1 1 10 –25 –20 –15 –10 –5 0 5 10 15 INPUT (dBm) 450MHz 900MHz 1900MHz 2350MHz 2600MHz Figure 4. Measured PEAK Output vs. Input Level (Log Scale), 450 MHz, 900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.2 0.4 0.6 0.8 1.0 INPUT (V rms) 450MHz 900MHz 1900MHz 2350MHz 2600MHz Figure 5. Measured PEAK Output vs. Input Level (Linear Scale), 450 MHz, 900 MHz, 1900 MHz, 2350 MHz, 2600 MHz, Supply +3.3 V The turn-on time and pulse response is strongly influenced by the size of the square-domain filter (CFLTR) and output shunt capacitor connected to the VRMS output. Figure 6 (taken from the ADL5502 data sheet) shows a plot of the output response to an RF pulse on the RFIN pin, with a 0.1 μF output filter capacitor and no square-domain filter capacitor (CFLTR). The falling edge is particularly dependent on the output shunt capacitance. 1ms/DIV 70mV rms 160mV rms 250mV rms 400mV rms RF INPUT VRMS PULSED RFIN Figure 6. Output Response to Various RF Input Pulse Levels, Supply3 V, 900 MHz Frequency, Square-Domain Filter Open, Output Filter 0.1 μF To improve the falling edge of the enable and pulse responses, a resistor can be placed in parallel with the output shunt capacitor. The added resistance helps to discharge the output filter capacitor. Although this method reduces the power-off time, the added load resistor also attenuates the output (see the Output Drive Capability and Buffering section of the ADL5502 data sheet). Figure 7 (taken from the ADL5502 data sheet) shows the improvement obtained by adding a parallel 1 kΩ resistor. |
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Similar Description - ADL5502 |
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