II want to use ADL5380 at 400 MHz to 6 GHz demodulation. But ADL5380 ADJ pin resistor will affect optimizes third-order intercept's fit frequency. Could I add ADG704 to choose fit resistor ( to switch resistor)? Thank you.
Yes, you can use a CMOS switch such as the ADG704 to switch in different bias resistors.
Thank you for your help. Thank you.
Could you tell me that 4G to 5G frequency ADL5380 ADJ resistor recommended value ? Thank you.
We don't have a recommended value in the datasheet for that frequency. I would suggest that you try the values that are recommended at 3.6 GHz (200 ohms) and 5.8 GHz (open). If either of these meets your needs, then you are all set. If not then you should try some values in between. It's important to remember that varying the ADJ resistor produces a trade-off between IP3 and Noise Figure. So as IP3 increases, NF will degrade. So the ideal value for you will depend on your specific needs.
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