Ad and da convertors and display devices
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A/D and D/A convertors are therefore used.An analogue signal cannot be represented exactly by a digital signal and must be sampled at sufficient intervals for all relevant information to be retainedSampling theory states that at least two samples must be obtained per period of the highest frequency componentIf the highest frequency component is fs then the period of the sampling signal is given by:- T < 1/2 fsFig2 Sample and HoldFig.2 shows a basic sample and hold circuitThe capacitor C is used as a store or memory to hold the value of the sampleIt is connected to the analogue signal input via the resistor R
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