Question

An advantage of dual slope A/D converter is:

• A. is faster
• B. eliminates error due to drift
• C. can reduce errors due to power supply
• D. does not require a stable voltage source

Hint:

Dual slope ADCs are slow but accurate in noisy environments.

Answer 1

The Correct Option is C

An advantage of using a dual slope A/D converter is its ability to minimize errors related to power supply variations. This is due to the converter's integration approach, which inherently averages out noise and fluctuations over time. Let's explore how this occurs:

• The dual slope integration method involves first integrating the input voltage over a fixed period.
• This is followed by a de-integration process, where a reference voltage is applied to bring the integrator output back to zero.
• This technique ensures that any short-term fluctuations in the power supply are averaged out over the integration period, significantly reducing error.

Thus, the option "can reduce errors due to power supply" accurately describes the key benefit of the dual slope A/D converter.