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why DC offset affects the performance of Zero-IF

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Julian18

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Hi, there,
This is a conceptual question, why does DC offset affect the performance of direct-conversion RF receiver?

TIA.
 

zpb2k

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DC offset potentially shifts DC operating points of following gain stages, saturating them, causing signal clipping and reducing amplifier's input sensitivity and dynamic range. Of course, this is bad for zero-IF since the DC component is right in desired signal bandwidth and hard to be discriminated.
 

khouly

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also the DC can saturate the DAC used in the Baseband so the signal will be totally lost

also in the ZIF , the scond order intermodulation product are very critical "need to be minimized"

khouly
 

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