No group session today

I wont be able to attend the group session today due to illness (again..) However, I will be available on email if you should have any questions related to the assignment or project. 

Today I was thinking to go through transistor biasing in ADS with you. I have uploaded two ADS schematics in the "project" folder for 1) biasing and 2) s-parameters for a biased transistor. 

1) In the DC bias schematic you run a simulation with different Vg while sweeping Vd and probing the currents. This should help you choose a suitable BIAS point. 

2) With the correct bias voltage you can start looking at the transistors S-parameters. In both schematics I've used ideal DC-feed (lossless inductor with high inductance) and DC-block (lossless capacitor with high capacitance). These components will not alter your S-parameters. If you run this simulation you can look at S11 & S22 (input and output reflection coefficient), S21(forward gain) and S12(reverse gain). There is also a result for MaxGain, which is the theoretical maximum gain the device can achieve if the input and output are matched. 

Before you start matching you're device(s) you should design an un-ideal bias tee. You can read about bias tees on microwaves101-bias-tee. This can be designed using lumped components or by using quarter wave transmission lines.