Analog to digital converter circuit
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If the DAC output voltage is equal to the input analog voltage, then it generates low clock pulse and it also generates a clear signal to the counter and load signal to the storage resistor to store the corresponding digital bits. The same process will be repeated until the DAC output equals to the input analog voltage. The op-amp compares the two voltages and if the generated DAC voltage is less, it generates a high pulse to the N bitĬounter as a clock pulse to increment the counter. The analog output corresponding to the digital input from DAC is compared with the input analog voltage using an op-amp comparator. The N bit counter generates an n bit digital output which is applied as an input to the DAC. Main Components of Counter Type ADCįollowings are the main components of ramp type analog to digital converter circuit: One such A/D converter is the counter type A/D converter represented by the block schematic as below. And it can build with a single comparator by using a variable reference voltage. To avoid this huge requirement of comparator, it is possible to construct higher-resolution A/D converters. In case of simultaneous or flash type ADC we now the requirement of comparator for n bit ADC is 2n-1.
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This tutorial is an introduction to the Counter type analog to digital converter working, advantages and disadvantages.