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AD8367 Self-excitation problem

Question asked by pioneer.liu on Nov 24, 2014
Latest reply on Dec 1, 2014 by jdobler

frequency used is 70MHz, circuit is configured according to datasheet, PCB layout is almost the same as EVB,when control voltage>0.8V,    Self-excitation will appear; and after input circuit is matched with balun, Self-excitation will still appear;

issue is described below:

1. when control voltage=0.85V,Pout=-23.29@70MHz, output power= -16dBm@860MHz;

2.when control voltage=0.9V,Pout=-19.78dBm@70MHz,output power=4dBm@570MHz;

3.when control voltage=1V, output power=0dBm@40MHz~7000MHz;

enclosed is SCH and PCB layout, thanks!

 

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