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testing a direct IF rec linearity - receiver spurs

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zeshan102

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Receiver Spurs

I am testing a direct IF rec linearity and out is quite linear to input power but spurs start to apear even 6 dB before the compression point which stage is saturating before
 

Receiver Spurs

Is it due to insufficient shielding?
try covering your receiver circuit with some metallic body and check.
 

Re: Receiver Spurs

I cannot do anything about sheiding beacuse its chip but i can vary the power supply of different stage in IC by programing like supply to IF filter LNA and LO so which can effect most to reduce these spurs.

I am measuring at I Q before ADC and yes when input is low spurs didnt seems to appear
 

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