cascode resonance frequency

It looks like your parametric analysis is only plotting data points at those ordinals. The data points do not fall on the true peaks. You need to increase the plotting resolution.

analysis:

I was plotting only 10 points per decade! ..I set it to automatic and it runs perfectly! thank you andrew ..it was driving me mad :P matteo

analysis:

I was plotting only 10 points per decade! ..I set it to automatic and it runs perfectly! thank you andrew ..it was driving me mad :P matteo

You really don't want to do it this way, unless you absolutely don't care about noise figure, and have a signal that has previously been band limited.

On the input, you need an LC matching network to match the source to the gate input impedance. No physical resistors. Let the resistive part of the gate input impedance control the loaded Q.

On the output, same thing; let the input impedance of the next stage be the R.

Getting 100 MHz bandwidth is going to be difficult with simple 1L/ 1C networks. You would need an effective Q of about 8 for the two stages combined. Without doing all the math, a Q of 7 on the input and a Q of 4 on the output might be close.

Tam

I believe the term you are looking for is "complex conjugate" matching. Something else to look into is "staggered tuning". One nice trick is to use an over-coupled transformer; that over-coupling widens the (tuned) bandwidth if primary and secondary are tuned the same (as i remember from~30 years ago).

What initially threw me for a loop was C0 and C1 in *Farads*, which is insane. The second insane thing was that C0 was specified to SIX significant digits!!!