Flash ADC (Parallel ADC) and Half-Flash ADC Explained

In this video, the working of Flash (Parallel) type ADC and Half-Flash ADC is explained.

By watching this video, you will learn the following topics:

0:27 Flash ADC Working

7:07 Flash ADC Advantages and Disadvantages

8:26 Half-flash ADC working

The Flash ADC:

The Flash ADC (also known as parallel ADC) is fastest among all ADCs.

The Flash ADC consists of

1) High-speed Comparator
2) Resistive Voltage Divider Network
3) Encoder Circuit

In this video, the working of 3-bit Flash ADC is explained.

Advantages of Flash ADC:

It is fastest among all other ADCs and it is suitable for large bandwidth applications ( e.g Satellite Communication, High-Speed Data Acquisition for Oscilloscope, etc)

Disadvantages:
1) High Power Consumption
2) Large Die Size
3) High Cost
4) Limited Resolution
5) High Accuracy of the Components (Resistors and Comparators)

Half-Flash ADC:
In applications where low power consumption and small die area is main criteria (for the same resolution with relatively good conversion speed) then Half-Flash ADC can be used.

For N-bit Conversion, this Half-Flash ADC requires two (N/2) bit Flash ADC and one (N/2) bit DAC.
In this video, the working of 8-bit Half-flash ADC is explained.

The link to the other useful videos related to ADC and DAC:

1) Introduction to ADC and DAC
https://youtu.be/HicZcgdGxZY

2) Dual Slope ADC
https://youtu.be/2gF_nfaBV_0

3) R-2R ladder DAC
https://youtu.be/Pc1aFloxSMw

4) Counter Type ADC
https://youtu.be/4zwtA2pG6Vc

5) Tracking Type ADC
https://youtu.be/MMQwa416Cmo

6) Successive Approximation ADC
https://youtu.be/h0CGtr4SC9s

This video will be helpful to all the students of science and engineering in understanding the working of Flash ADC and Half-Flash ADC.


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