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What is processing gain?

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What is processing gain?

(a) Gain added by the ADC

(b) Improvement in SNR

(c) Amplitude increment by ADC

(d) Reduction in error by the ADC circuitry

The question was asked in an internship interview.

My question comes from Data Conversion topic in chapter Digital Communication Techniques of Avionics

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The correct answer is (b) Improvement in SNR

The explanation: One of the major advantages of oversampling is that it increases the signal to noise ratio(SNR). It decreases the quantization noise by spreading it over a wider frequency. The increase in SNR is called the processing gain.

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