UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 6-gang FM stereo tuner heads

regenfreak · 17th Dec 2022, 6:34 am

Attached are examples of the Y21, Y11, Y22, S11 and S21 from BF998 DGM datasheet. It is nice to see both Y and S parameters in a datasheet.

It is very difficult for manufacturers to measure short circuit conditions at high RF frequencies for the two-port network Y-parameters. Probably, Y12 cannot be measured directly. On the other hand, the S-parameters are much easier to measure with a VNA, and they are more intuitive to understand than Y-parameters. So the y-parameters are out of fashion, but most old IEEE papers used y-parameters in their design calculations, and so did many of the dual gate MOSFET datasheets.

17th Dec 2022, 6:34 am	#367
regenfreak Heptode Join Date: Nov 2018 Location: London SW16, UK. Posts: 655	Re: 6-gang FM stereo tuner heads Attached are examples of the Y21, Y11, Y22, S11 and S21 from BF998 DGM datasheet. It is nice to see both Y and S parameters in a datasheet. It is very difficult for manufacturers to measure short circuit conditions at high RF frequencies for the two-port network Y-parameters. Probably, Y12 cannot be measured directly. On the other hand, the S-parameters are much easier to measure with a VNA, and they are more intuitive to understand than Y-parameters. So the y-parameters are out of fashion, but most old IEEE papers used y-parameters in their design calculations, and so did many of the dual gate MOSFET datasheets. Attached Thumbnails