Fikadu
Junior Member level 3
Hello every one,
I am software guy, don't have much idea about RF design.
These days, I am trying to experiment on phase detector IC(AD8302). As attached figure, while trying to measure an input values at pin INPA and INPB, it always reads 4.85V. This reading is the same whether there is RF power or not. Actually, the output reading is correct as compare to phase shift on Oscilloscope. An input limitation(maximum) at those to pins is –13dbV(0.22V) as it is described on the datasheet. Even that was why I added the voltage divider on the input side as shown in the figure. My doubt here is that, why the reading is always 4.85V and would it be safe? can input at pin INPA and INPB exceeds –13dbV(0.22V) ?
I would like to thank all in advance.
I am software guy, don't have much idea about RF design.
These days, I am trying to experiment on phase detector IC(AD8302). As attached figure, while trying to measure an input values at pin INPA and INPB, it always reads 4.85V. This reading is the same whether there is RF power or not. Actually, the output reading is correct as compare to phase shift on Oscilloscope. An input limitation(maximum) at those to pins is –13dbV(0.22V) as it is described on the datasheet. Even that was why I added the voltage divider on the input side as shown in the figure. My doubt here is that, why the reading is always 4.85V and would it be safe? can input at pin INPA and INPB exceeds –13dbV(0.22V) ?
I would like to thank all in advance.