![]() It converts the analog or continuous amplitude into discrete amplitude. The hold value remains unchanged till the next sample. It only holds the sample amplitude until the next sample is taken. The second block used in ADC is the ‘ Hold’ block. The sampling rate is set according to the requirement of the system. The sampling frequency plays important role in the conversion. ![]() The samples are taken in continuous amplitude & possess real value but they are discrete with respect to time. The sample block function is to sample the input analog signal at a specific time interval. The conversion from analog signal to a digital signal in an analog to digital converter is explained below using the block diagram given above. ![]() At last, the ‘ encoder‘ converts the discrete amplitude into a binary number. The hold sample is quantized into discrete value by the ‘ quantize‘ block. The sample amplitude value is maintained and held in the ‘ hold‘ block. The analog signal is first applied to the ‘ sample‘ block where it is sampled at a specific sampling frequency.
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