youngguns21
Member level 2
Hi all,
I am trying to understand what is going on in my balanced FET design. The design is optimized for minimum noise figure and uses lange couplers on the input and output. Looking at the simulation of each arm alone shows a noise figure of 0.7dB. If I include the couplers and look at the balanced block the NF jumps to ~5dB, but in real life the NF is less than 3dB.
So my question is: Why such a huge difference? I substituted ideal 3dB couplers in the simulation and still that gets me from 7db to 5dB.
Thanks for the help
I am trying to understand what is going on in my balanced FET design. The design is optimized for minimum noise figure and uses lange couplers on the input and output. Looking at the simulation of each arm alone shows a noise figure of 0.7dB. If I include the couplers and look at the balanced block the NF jumps to ~5dB, but in real life the NF is less than 3dB.
So my question is: Why such a huge difference? I substituted ideal 3dB couplers in the simulation and still that gets me from 7db to 5dB.
Thanks for the help