Question

If the converter of Dual-slope ADC first integrates the analog input signal for a fixed duration, then the clock periods are

• A. \(n\)
• B. \(n-1\)
• C. \(2^n\)
• D. \(2^{n-1}\)

Hint:

In dual-slope ADCs, the integration interval is generally chosen as \(2^n\) clock cycles to achieve \(n\)-bit resolution.

Answer 1

The Correct Option is C

Concept: A dual-slope ADC operates in two phases:
• Integration of the unknown input voltage.
• De-integration using a reference voltage. For an \(n\)-bit dual-slope ADC, the fixed integration interval is selected as \[ 2^n \] clock periods.

Step 1: Recall dual-slope ADC operation.
The unknown voltage is integrated for a fixed time. This fixed time corresponds to \[ 2^n \] clock pulses.

Step 2: State the result.
Therefore, \[ \boxed{2^n} \] clock periods are used.