EL4450CS 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL4450CS

Wideband Four-Quadrant Multiplier

Elantec -> Intersil 

EL4450C

Wideband Four-Quadrant Multiplier

Figure 3. Simplified AGC Detector/DC Feedback Circuit

Here the internal op-amp of the EL4450C replaces the

external amplifier. The feedback capacitor CF does not

provide a perfect integration action; a zero occurs at a

frequency of 1/2¼RCF. This is canceled by including

another RCF pair at the AGC control output. If the refer-

ence voltage must be negative, the resistor at pin 11 is

connected to ground rather than the reference and pin 10

connected to the reference.

The amplitude reference will have to support some AC

currents flowing through R. If this is a problem, several

changes can be made to

eliminate it. The reference is connected to pin 10 and the

resistor R connected to pin 11 reconnected to ground,

and one of the multiplier input connections are reversed.

Square-law detectors have a restricted input range, about

10:1, because the output rapidly disappears into the DC

errors as signal amplitudes reduce. This circuit gives a

multiplier output that is the absolute value of the input,

thus increasing range to 100:1:

10

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