arefeidi
Member level 4
Hi,
I currently have some problems with matching the MGA71543 LNA ( ). To match a low noise amplifier, I usually plot the optimum noise match point and maximum gain (=s11* conjugate complex) match point, and then chose a matching network somewhere between both points to have a good noise match while still maintaining a decent S11.
Though - with the MGA71543 I now have a strange result for plotting the maximum gain match. I expect a single point (= s11 conjugate complex), but it gives me a circle of (completely different) impedances which apparently all lead to the maximum possible gain!? (see attached picture)
Can this be correct? Why is MaxGain on a circle and not a single point?
I currently have some problems with matching the MGA71543 LNA ( ). To match a low noise amplifier, I usually plot the optimum noise match point and maximum gain (=s11* conjugate complex) match point, and then chose a matching network somewhere between both points to have a good noise match while still maintaining a decent S11.
Though - with the MGA71543 I now have a strange result for plotting the maximum gain match. I expect a single point (= s11 conjugate complex), but it gives me a circle of (completely different) impedances which apparently all lead to the maximum possible gain!? (see attached picture)
Can this be correct? Why is MaxGain on a circle and not a single point?