12/11/12 sample and hold circuit using op amp 741...

12/11/12 SAMPLE AND HOLD CIRCUIT USING OP AMP 741 | MY CIRCUITS 9

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SAMPLE AND HOLD CIRCUIT USING OPAMP 741

9:12 AM Posted by Tittu Thomas

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The sample and hold circuit, as its name implies, samples an input signal and holds on its last sampled

value until the input is sampled again.

Figure shows the Circuit Diagram of a SAMPLE AND HOLD Circuit using 741 OP AMP with an E-MOSFET. In

this circuit the E-MOSFET works as a switch that is controlled by the sample-and-hold control voltage Vs,

and the capacitor C serves as a storage element.

CIRCUIT OPERATION OF SAMPLE AND HOLD

The analog signal Vin to be sampled is applied to the drain, and sample and hold control voltage Vs is

applied to the gate of the E-MOSFET. During the Positive portion of Vs, the E-mosfet conducts and act as a

closed switch. This allows input voltage to charge capacitor C. In other words input voltage appears across

C and in turn at the output, as shown in figure below-

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Function

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Working with

Blo...

PRECISION

RECTIFIERS

HALF WAVE

AND ...

OP AMP

COMPARATOR

TUTORIAL

OPTOCOUPLER

OR

OPTOISOLATOR

TUTORIA...

Voltage and

Current

Converter

Using...

On the other hand, when Vs is zero the E-mosfet is off (Non conductive) and acts as an open switch. The

only discharge path for C is, therefore, through the operational amplifier (OP AMP). However, the input

resistance of the op amp voltage follower is also very high; hence the voltage across C is retained. The time

periods Ts of the sample and hold control voltage Vs during which the voltage across the capacitor is equal

to the input voltage are called sample periods. The time period Th of Vs during which the voltage across the

capacitor is constant are called hold periods. The output of the OP-AMP is usually processed/observed

during hold periods. To obtain close approximation of the input wave form, the frequency of the sample and

hold control voltage must be significantly higher than that of the input. In critical applications a precision or

high speed op amp is helpful. If possible choose a low-leakage capacitor made of material such as teflon or

polyethylene.

A significant reduction in size and improved performance can be achieved by using a specially designed

sample and hold IC such as the LF398. The sample and hold circuit is commonly used in digital interfacing

and communications such as analog to digital and pulse modulation systems.

You may also like:-ZERO CROSSING DETECTOR USING OP AMP

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