What is parallel flash ADC?
Abstract: Flash analog-to-digital converters, also known as parallel ADCs, are the fastest way to convert an analog signal to a digital signal. Flash ADCs are ideal for applications requiring very large bandwidth, but they consume more power than other ADC architectures and are generally limited to 8-bit resolution.
What is the advantage 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 advantages and disadvantages of 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 is 2-bit flash ADC?
2-bit Flash ADC uses -1 TIQ comparators which generate reference voltages internally to compare the input voltage and generates thermometer code for each combination of analog input. This thermometer code is then converted to 2-bit binary code using a thermometer-binary encoder.
Why is it called flash ADC?
A flash ADC (also known as a direct-conversion ADC) is a type of analog-to-digital converter that uses a linear voltage ladder with a comparator at each “rung” of the ladder to compare the input voltage to successive reference voltages.
Where are flash ADC used?
The very high sample rate of this type of ADC enables high-frequency applications (typically in a few GHz range) like radar detection, wideband radio receivers, electronic test equipment, and optical communication links. More often the flash ADC is embedded in a large IC containing many digital decoding functions.
What are the limitations of flash ADC?
The main disadvantage of flash ADC is that it need large area and dissipate large amount of power. To overcome this complexity number of comparators are reducing by using multiplexers. Here the multiplexers are used to generate reference voltages.
How does flash ADC work?
Which is fastest ADC?
flash ADC
The flash ADC is the fastest type available. A flash ADC uses comparators, one per voltage step, and a string of resistors. A 4-bit ADC will have 16 comparators, an 8-bit ADC will have 256 comparators.