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X ( f ). f. f. f. F s /2. F s. Properly Sampled Sinusoid. At Input to ADC. Inside DAC. -2F s. -F s. -F s /2. F s /2. F s. 2F s. Output of DAC. F s /2. X ( f ). f. f. f. Under-Sampled Sinusoid. At Input to ADC. F s /2. F s. Inside DAC. -2F s. -F s. -F s /2. F s /2.

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X f

X( f )

f

f

f

Fs/2

Fs

Properly Sampled Sinusoid

At Input to ADC

Inside DAC

-2Fs

-Fs

-Fs/2

Fs/2

Fs

2Fs

Output of DAC

Fs/2


X f

X( f )

f

f

f

Under-Sampled Sinusoid

At Input to ADC

Fs/2

Fs

Inside DAC

-2Fs

-Fs

-Fs/2

Fs/2

Fs

2Fs

Output of DAC

Fs/2


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