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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AD834JRZ-RL Fiches technique(PDF) 16 Page - Analog Devices |
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AD834JRZ-RL Fiches technique(HTML) 16 Page - Analog Devices |
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16 / 20 page  AD834 Data Sheet Rev. F | Page 16 of 20 FREQUENCY DOUBLER Figure 21 shows another squaring application. In this case, the output filter has been removed and the wideband differential output is converted to a single-sided signal using a balun, which consists of a length of 50 Ω coaxial cable fed through a ferrite core (Fair-Rite Type 2677006301). No attempt is made to reverse terminate the output. Higher load power can be achieved by replacing the 50 Ω load resistors with ferrite bead inductors. The same precautions should be observed with regard to printed circuit board (PCB) layout as recommended in the Power Measurement (Mean-Square and RMS) section. The output spectrum shown in Figure 22 is for an input power of +10 dBm at a frequency of 200 MHz. The second harmonic component at 400 MHz has an output power of −15 dBm. Some feedthrough of the fundamental occurs; it is 15 dB below the main output. A spurious output at 600 MHz is also present, but it is 30 dB below the main output. At an input frequency of 100 MHz, the measured power level at 200 MHz is −16 dBm, while the fundamental feedthrough is reduced to 25 dB below the main output; at an output of 600 MHz the power is −11 dBm and the third harmonic at 900 MHz is 32 dB below the main output. SMA FROM HP8656A GENERATOR SMA TO HP8656A SPECTRUM ANALYZER 8 7 6 5 1 2 3 4 X2 X1 +VS W1 Y1 Y2 –VS W2 AD834 0.1µF 0.1µF 0.1µF 0.1µF 75Ω 560pF 560pF BALUN +5V 10Ω 49.9Ω 49.9Ω –5V 25Ω 125Ω 125Ω 25Ω Figure 21. Frequency Doubler Connections FREQUENCY (MHz) –10 150 –20 –30 –40 –50 –60 –70 –80 –90 –100 0 200 250 300 350 400 450 500 550 600 650 Figure 22. Output Spectrum for Configuration of Figure 21 WIDEBAND THREE-SIGNAL MULTIPLIER/DIVIDER Two AD834 devices and a wideband op amp can be connected to make a versatile multiplier/divider having the transfer function ( )( ) ( ) Z U2 U1 Y2 Y1 X2 X1 W + − − − = with a denominator range of about 100:1. The denominator input U = U1 − U2 must be positive and in the range 100 mV to 10 V; X, Y, and Z inputs may have either polarity. Figure 23 shows a general configuration that may be simplified to suit a particular application. This circuit accepts full-scale input voltages of 10 V, and delivers a full-scale output voltage of 10 V. The optional offset trim at the output of the AD834 improves the accuracy for small denominator values. It is adjusted by nulling the output voltage when the X and Y inputs are zero and U = 100 mV. The op amp is internally compensated to be stable without the use of any additional HF compensation. As Input U is reduced, the bandwidth falls because the feedback around the op amp is proportional to Input U. Note that, this circuit was originally characterized using the AD840 op amp; some alternative op amps include the AD818 and the AD8021. This circuit can be modified in several ways. For example, if the differential input feature is not needed, the unused input can be connected to ground through a single resistor, equal to the parallel sum of the resistors in the attenuator section. The full-scale input levels on X, Y, and U can be adapted to any full-scale voltage down to ±1 V by altering the attenuator ratios. Note, however, that precautions must be taken if the attenuator ratio from the output of A3 back to the second AD834 (A2) is lowered. First, the HF compensation limit of the op amp may be exceeded if the negative feedback factor is too high. Second, if the attenuated output at the AD834 exceeds its clipping level of ±1.3 V, feedback control is lost and the output suddenly jumps to the supply rails. However, with these limitations understood, it is possible to adapt the circuit to smaller full-scale inputs and/or outputs, for use with lower supply voltages. |
Numéro de pièce similaire - AD834JRZ-RL |
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Description similaire - AD834JRZ-RL |
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