Flash ADC Minimum Comparators Calculation
A flash Analog-to-Digital Converter (ADC) determines the digital equivalent of an analog input by comparing the input voltage against multiple reference voltages simultaneously. Each comparison requires a comparator circuit.
Comparators for N-Bit Flash ADC
The minimum number of comparators required for an N-bit flash ADC is determined by the number of quantization levels needed. For N bits, there are possible output codes. Each code transition requires a comparison point.
The formula to calculate the minimum number of comparators (C) for an N-bit flash ADC is:
Calculation for 6-Bit Flash ADC
Given that the flash ADC is 6-bit, we have N = 6.
Substitute N = 6 into the formula:
Calculate the value:
Therefore, the minimum number of comparators required for a 6-bit flash ADC is 63.
Important Questions from Analog To Digital Converters
Which is known as flash converter?
A 200 mV full-scale dual-slope analog to digital converter (DS-ADC) has a reference voltage of 100 mV. The first integration time is set as 100 ms. The DS-ADC is operated in the continuous conversion mode. The conversion time of the DS-ADC for an input voltage of 123.4 mV (in ms, rounded off to one decimal place) is
- The number of comparator required for a 5 bit flash ADC is ____________.
In successive approximation converter input to the comparator is through
Assertion (A) : Dual slope (A/D) converter is the most preferred conversion technique employed in most of the digital multimeters.
Reason (R) : Dual slope (A/D) converter provides high accuracy while at the same time suppresses the HUM effect on the input signal.
