Question

Match List I with List II

List I	List II
A. Simplest type of ADC	1. Flash-type ADC
B. Fastest ADC	2. dual-slope type ADC
C. Slowest ADC	3. counter-type ADC
D. Most widely used ADC	4. Successive – approximation type ADC

Choose the correct answer from the options given below:

1. A - 3, B - 1, C - 2, D - 4
2. A - 2, B - 4, C - 1, D - 3
3. A - 4, B - 2, C - 3, D - 1
4. A - 3, B - 4, C - 2, D - 1

Answer 1

Correct Answer - Option 1 : A - 3, B - 1, C - 2, D - 4

Parameters	Flash type ADC	Successive Approximation type ADC	Dual Slope type ADC
CONVERSION TIME	Shortest	Moderately long	Longest
SPEED	Fastest	Faster than the dual-slope	Slowest
ACCURACY OF CONVERSION	Less accurate	Moderately accurate	Very accurate
COST	Very costly	Moderately high	Low
ADVANTAGES	High speed and no input hold time	Constant conversion of time, good speed	High accuracy low cost
DISADVANTAGES	Low accuracy, high cost	Not many	Long conversion time, low speed
APPLICATIONS	All high-speed applications such as CRO, fiber optic communication	All data acquisition systems	All those application which need very high accuracy

 

Counter type ADC:

• Counter-type ADC is very simple to understand and also easy to operate.
• Counter-type ADC design is less complex, so the cost is also less.
• ·Speed is less, since each time the counter has to begin from ZERO.
• There may be conflicts if the next input is sampled before the completion of one process.
• In a Counter type ADC, the conversion time varies.

IMPORTANT POINTS:

Comparison (best to worst)

Resolution	Speed
Dual-slope integrating	Flash
Counter	Tracking
Tracking	Successive Approximation
Successive approximation	Counter
Flash	Dual-slope integrating