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.
What is the number of comparators required to design a 2 bit flash ADC?
1) It is the fastest ADC among all the ADC types. 2) An n-bit flash type ADC requires: 2n -1 comparators, 2n resistors and one 2n × n priority encoder.
What is the resolution of 2 bit ADC?
What is resolution? So in this example, the 2-bit digital value can represent 4 different numbers, and the voltage input range of 0 to 10 volts is divided into 4 pieces giving a voltage resolution of 2.5 volts per bit.
What are flash ADCs used for?
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.
How many comparators are used in flash ADC?
Flash ADC architecture uses 2 N resistors and 2 N -1 comparators to convert an N-bit data. In traditional flash ADC architecture 2 N -1 comparators will work in parallel, which will cause high power consumption.
What is the main component in the flash ADC?
A 3-bit Flash ADC consists of seven comparators, a resistive voltage divider circuit that contains 8 series resistors, and a priority encoder. The input analog voltage is applied to the positive terminal of the comparator while the reference voltage is applied to the negative end of the comparator.
What are the limitations of flash ADC?
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 3 bit flash ADC?
Which ADC fast?
Flash ADC
Flash ADC (Fastest) 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.