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AD834AR Fiches technique(PDF) 8 Page - Analog Devices |
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AD834AR Fiches technique(HTML) 8 Page - Analog Devices |
8 / 8 page AD834 REV. C –8– Figure 14. Frequency Doubler Connections Figure 15. Output Spectrum for Configuration of Figure 14 WIDEBAND THREE SIGNAL MULTIPLIER/DIVIDER Two AD834s and a wideband op amp can be connected to make a versatile multiplier/divider having the transfer function W = (X1– X 2)(Y1–Y 2) (U1–U 2) + Z with a denominator range of about 100:1. The denominator in- put 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 16 shows a general configuration which may be simplified to suit a particular application. This circuit accepts full-scale input volt- ages 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 AD840 is internally compensated to be stable without the use of any additional HF compensation. As the input U is re- duced, the bandwidth falls because the feedback around the op amp is proportional to the input U. This circuit may be modified in several ways. For example, if the differential input feature is not needed, the unused input Figure 16. Wideband Three Signal Multiplier/Divider 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 AD840 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 will be lost and the output will sud- denly jump to the supply rails. However, with these limitations understood, it will be possible to adapt the circuit to smaller full-scale inputs and/or outputs, and for use with lower supply voltages. |
Numéro de pièce similaire - AD834AR |
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Description similaire - AD834AR |
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