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AD834JR-REEL7 데이터시트(PDF) 8 Page - Analog Devices

부품명 AD834JR-REEL7
상세설명  500 MHz Four-Quadrant Multiplier
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AD834JR-REEL7 데이터시트(HTML) 8 Page - Analog Devices

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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.


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