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G0HZU_JMR · 21st Apr 2021, 9:34 pm

Thanks! The VNA I used was the 4 port Agilent E5071 and I used an Agilent N4431-60006B Ecal calibration module along with the test fixture so the s-parameter models I produce should be representative of the real device.

I think Ron is going to try the SOT-23 MMBF4416 with drain and source swapped. Sadly I don't have any SOT-23 MMBF4416 but have a lot of SOT-23 MMBF4416A parts here. I'd expect the 4416 to be very similar to the 4416A that I tested on the VNA as they are both process 50 devices.

It would be interesting to check out the MMBFJ310 on the VNA for symmetry as it is described as symmetric. However, this device is from process 92 so I'm not sure it could be used in this probe. I've got some on SMD tape so I could try this one day.

21st Apr 2021, 9:34 pm	#11
G0HZU_JMR Dekatron Join Date: Sep 2010 Location: Cheltenham, Gloucestershire, UK. Posts: 3,077	Re: Tektronix P6201 FET Probe repair Thanks! The VNA I used was the 4 port Agilent E5071 and I used an Agilent N4431-60006B Ecal calibration module along with the test fixture so the s-parameter models I produce should be representative of the real device. I think Ron is going to try the SOT-23 MMBF4416 with drain and source swapped. Sadly I don't have any SOT-23 MMBF4416 but have a lot of SOT-23 MMBF4416A parts here. I'd expect the 4416 to be very similar to the 4416A that I tested on the VNA as they are both process 50 devices. It would be interesting to check out the MMBFJ310 on the VNA for symmetry as it is described as symmetric. However, this device is from process 92 so I'm not sure it could be used in this probe. I've got some on SMD tape so I could try this one day. __________________ Regards, Jeremy G0HZU