Topic: Communication Systems
Maximum value of signal to noise ratio of an 8-bit ADC with an input range of 10 V will be
- A. 50 dB
- B. 43.8 dB
- C. 48.9 dB
- D. 49.8 dB
Answer: D. 49.8 dB
Explanation: For an $n$-bit ADC, the maximum Signal-to-Quantization Noise Ratio (SQNR) is approximated by the formula:
$SQNR \approx 6n + 1.8~\text{dB}$
For $n=8$ bits:
$SQNR = 6(8) + 1.8 = 48 + 1.8 = 49.8~\text{dB}$.