| FIGURE 1 |
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| In (a), a basic superhet receiver takes an amplified RF signal, mixes down to an IF using a local oscillator, then demodulates (decodes) the fixed-frequency IF signal. A double-conversion receiver includes another mixer/LO/IF stage after the RF amp. In digital IF down-conversion (b), the RF (or IF signal, depending on carrier frequency) is bandpass-filtered and then undersampled; the resultant sample values are processed within the DSP to produce the recovered signal. |
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