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X ( f )

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 )

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  1. 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

  2. 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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