why DC offset affects the performance of Zero-IF

[Julian18]

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

TIA.

 

[zpb2k]

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]

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