I need to cascade two amplifier AD8331. Second amplifier should be connected without LNA. Can i connect it this way?
As suggested in the data sheet in using AD8331 with LNA disabled, yes you can connect that way. With your R10 value of 16kohm, you can use 16.9 kohm with 1% tolerance to have a clamp level of 3.0 Vp-p as stated in the datasheet.
In addition to your circuit, 100 pF to 1 nF bypass capacitor in the GAIN pin is recommended. Regards.
You may also consider in your application:
You may also have these parts considered in your preferred application. Thanks and Regards.
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