bfr93 s-parameters
Thanks
The best way is to use an expensive test set designed for this use. If you do not have access to one you could ask the manufacturer for the values. If they do not respond you can get lower frequency parameters by using the data sheet parameters to get the hybrid pi lumped element model. From this you can use some very tedious equations to convert from hybrid two port parameters to s two port parameters.
A further thing is to get the hybrid parameters and do a SPICE simulation of whatever you are designing. Make a lumped element model of the transistor with R, C, and current generator parts.
Hi,
The S parameters of the BFR93 are specified by the different manufacturesr for different frequency ranges:
Philips: 40-3000 MHz
Infineon: 10-3000 MHz
(formerly) Motorola: 100-3000 MHz
Practically these cover the usable frequency range of the BFR93. (My advice: don't use the BFR93 at higher then 3 GHz, and for lower then 10MHz, you could find cheaper transistors)
You can do the S parameter measuremt by your own, as Flatulent says, but you need a VNA, a test fixture, and you have to de-embed the tranzistors parameters after the measurement is taken. In this case you could do the measurement at your particularly bias conditions.
Youa also can get the spice parameters (Philips and Infineon have them) and with the help of a simulator you can implement your model. Based on the S parameter files, you can check it, and you can validate your model (so called fit model to measured data). After that, you can do the simulation for your specific frequency/bias.
rgds,
Al
JIF,
you have the S2P file from the mnf? If so, ADS interpolates with a rather high degree of accuracy. I'm assumming that you are saying: datasheet has values for 1,2,3,4...20GHz but what is want is something like 2.6GHz... Run a S-para sim and let ADS interpolate the values for you :)