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HA1-2556-9 Datasheet(PDF) 8 Page - Intersil Corporation |
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HA1-2556-9 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 15 page 8 This multiplier has the advantage over other AGC circuits, in that the signal bandwidth is not affected by the control signal gain adjustment. Voltage Controlled Amplifier A wide range of gain adjustment is available with the Voltage Controlled Amplifier configuration shown in Figure 16. Here the gain of the HFA0002 can be swept from 20V/V to a gain of almost 1000V/V with a DC voltage from 0V to 5V. Wave Shaping Circuits Wave shaping or curve fitting is another class of application for the analog multiplier. For example, where a nonlinear sensor requires corrective curve fitting to improve linearity the HA-2556 can provide nonintegral powers in the range 1 to 2 or nonintegral roots in the range 0.5 to 1.0 (refer to References). This effect is displayed in Figure 17. A multiplier can’t do nonintegral roots “exactly”, but it can yield a close approximation. We can approximate nonintegral roots with equations of the form: Figure 18 compares the function VOUT = VIN 0.7 to the approximation VOUT = 0.5VIN 0.5 + 0.5V IN. This function can be easily built using an HA-2556 and a potentiometer for easy adjustment as shown in Figures 19 and 20. If a fixed nonintegral power is desired, the circuit shown in Figure 21 eliminates the need for the output buffer amp. These circuits approximate the function VIN M where M is the desired nonintegral power or root. FIGURE 15. AUTOMATIC GAIN CONTROL FIGURE 16. VOLTAGE CONTROLLED AMPLIFIER NC NC VY+ V- VOUT V+ NC NC 50 Ω HA-2556 5k Ω 10k Ω HA-5127 0.01 µF 10k Ω 0.1 µF 1N914 5.6V 0.1 µF +15V 20k Ω NC NC + - 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 Σ + - REF Y X Z NC NC VX + (VGAIN) V- VIN V+ NC NC HFA0002 5k Ω VOUT 500 Ω NC NC HA-2556 + - 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 Σ + - REF Y X Z 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 INPUT (V) X0.5 X0.7 X1.5 X2 FIGURE 17. EFFECT OF NONINTEGRAL POWERS / ROOTS V o 1 α – ()V IN 2 αV IN + = V o 1 α – ()V IN 12 ⁄ αV IN + = 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 INPUT (V) X X0.7 0.5X0.5+ 0.5X FIGURE 18. COMPARE APPROXIMATION TO NONINTEGRAL ROOT HA-2556 |
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