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Can ADC value be negative?
Indeed ADCs by themselves usually cannot work with negative values but there is no need. We can just “shift” the ADC’s working point so that all input voltages become positive. This “shifting” of the input voltage is quite trivial.
What are the advantages and disadvantages of a flash type ADC?
Block diagram of Flash ADC The advantage of this converter is the speed with which one conversion can take place. The disadvantage of the Flash ADC is the area and power requirements of the 2 N-1 comparators. The speed is limited by the switching of the comparators and the digital logic.
What are advantages of flash type ADC?
Advantages: 1)It is the fastest type of ADC because the conversion is performed simultaneously through a set of comparators, hence referred as flash type ADC. Typical conversion time is 100ns or less. 2)The construction is simple and easier to design.
What is the difference between ADC & DAC?
ADCs sample continuous analog signals over an input voltage range and convert them into digital representations (words) with resolution equal to the ADC’s number of bits. DACs convert digital input code into analog output signals, essentially providing the opposite function of an ADC.
What is the reference voltage for flash ADC?
The comparator outputs connect to the inputs of a priority encoder circuit, which then produces a binary output. The following illustration shows a 3-bit flash ADC circuit: V ref is a stable reference voltage provided by a precision voltage regulator as part of the converter circuit, not shown in the schematic.
Which is the most efficient flash ADC converter?
Not only is the flash converter the simplest in terms of operational theory, but it is the most efficient of the ADC technologies in terms of speed, being limited only in comparator and gate propagation delays. Unfortunately, it is the most component-intensive for any given number of output bits.
How is a priority encoder circuit formed in flash ADC?
It is formed of a series of comparators, each one comparing the input signal to a unique reference voltage. The comparator outputs connect to the inputs of a priority encoder circuit, which then produces a binary output.
How does a 3 bit flash ADC circuit work?
It is formed of a series of comparators, each one comparing the input signal to a unique reference voltage. The comparator outputs connect to the inputs of a priority encoder circuit, which then produces a binary output. The following illustration shows a 3-bit flash ADC circuit: