I have a stability problem and positive S11 in the amplifier HMC716. I have fabricated two stages of these amplifiers in one PCB. Between these two stages, I put 4 stages of bandpass filters chips from minicircuits. My question is what is the function of 0-ohm resistor that should be placed in output TL of this amplifier? Can I get the de-embedded S-parameters of HMC716 amplifier?

Hi,

zero ohm on the EVB has no purpose, you do not need to use that in your design.

We do not have de-embedded s-parameters, but you can use the spars given on the product page and the gerber files to model the PCB in a software environment for de-embedding.

You can also try the same signal chain with some attenuators between the amps and the filters to see if the problem is due to a impedance mis match.

Best,

Kagan