Question

Which of the following is NOT an advantage of the Linear Ramp Technique?
1. The accuracy depends on the slope of the ramp and stability of the local oscillator.
2. The circuit is easy to design and the cost is low.
3. The output pulse can be transferred over long feeder lines without loss of information.
4. The input signal is converted to time, which is easy to digitise.

Answer 1

Correct Answer - Option 1 : The accuracy depends on the slope of the ramp and stability of the local oscillator.

Explanation:

The advantages of the Linear Ramp Technique are:

• It has a better resolution and it can be adjusted because the resolution of digital readout is proportional to the frequency of local oscillator.
• The input signal is converted to time, which is easy to digitise.
• The polarity of the signal which is to be measured can be indicated by adding external logic.
• In this the analog to digital signal converted into time and the time can be easily digitized.
• It is easy to design and cost is low.
• The output pulse can be transferred over long feeder lines without loss of information.

The disadvantages of the Linear Ramp Technique are:

• The accuracy of the system is reduced by the drift and offset of two comparators.
• Basically the swing of ramp is in volt. This limit the range of measurement to the 10 volts.
• Accuracy of the system is depends on linearity of ramp, the slope of ramp and stability of local oscillator. So with the variation in these parameters, the accuracy of the system is changed. Hence option (1) mentioned is the disadvantage of the Linear Ramp Technique, so option (1) is the correct answer.