My previous question is following,
Our customer check the HARMONIC,SPUR,SFDR @ FFT,
but the AC specifications is degraded at the some sample.
The difference in the several samples are,
1.SFDR/Spur NG samples.
Power-down mode : RBIAS voltage 0.5V
Operational mode : RBIAS voltage 1.0V
2.SFDR/Spur OK samples.
Power-down mode : RBIAS voltage 0.0V
Operational mode : RBIAS voltage 0.5V
Which is correct value of "RBIAS voltage" ?
both is correct voltage and correct behavior?
Our customers try to place a 0.1uF bypass cap between RBIAS and analog ground, but the SFDR/Spur NG samples is more degraded.
Please advice to us for improving AC performance.