LTC6431-20 S-Parameters Correct File Confirmation?

Hi Steve,

The S Param file does show PORTs 1 and 3.  It is still a 2 Port measurement.  We have a 4 port network analyzer and just used Ports 1 and 3 to make a 2 Port measurement.   We show the results far beyond the intended operational range.  This is to show that the parts are stable and not oscillating out there.  With modern transistors the Ft can be over 50GHz and FMAX of 80GHz it is very important to make sure the devices are behaving even outside of your intended band.  If a device is oscillating outside your intended band it will still hammer the linearity in band.  Few other manufacturers provide this level of info but it is very important.

The SPARM  measurements are based on a SOLT calibration as Hooman has outlined.  The measurements are referenced to the package pins.

Regards,

Greg Fung

Hi Steve,

The S Param file does show PORTs 1 and 3.  It is still a 2 Port measurement.  We have a 4 port network analyzer and just used Ports 1 and 3 to make a 2 Port measurement.   We show the results far beyond the intended operational range.  This is to show that the parts are stable and not oscillating out there.  With modern transistors the Ft can be over 50GHz and FMAX of 80GHz it is very important to make sure the devices are behaving even outside of your intended band.  If a device is oscillating outside your intended band it will still hammer the linearity in band.  Few other manufacturers provide this level of info but it is very important.

The SPARM  measurements are based on a SOLT calibration as Hooman has outlined.  The measurements are referenced to the package pins.

Regards,

Greg Fung