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TRF1208: S4P matrix

Nicolas Schlumpf
Intellectual 340 points
Part Number: TRF1208


Hello,

For the design tools and simulation, you provide the TRF1208 3-ports S-parameter file from 10MHz up to 10GHz.

Would it be possible for you to provide me with the 4-ports S-parameter file from 1MHz up to 10GHz.

I would like to use the TRF1208 in a differential-differential configuration and need to do some simulation before.

Thanks,

Nicolas

  • 0
    TI__Prodigy 620 points

    Hello Nicolas,

    Attaching the s4p file of TRF1208. This is from 10MHz to 12GHz. The VNAs usually do not cover frequencies below 10MHz.  We have measured gain of the amp at very low frequencies using oscilloscope and found that it is flat down to 0.1MHz. For low frequencies, the coupling capacitors need to be increased to 2.2uF. But due to the SRF of the caps, the response at very high frequency suffers. 

    Regards,

    -Anil

  • 0 in reply to Anilkv
    TI__Prodigy 620 points

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/14/TRF1208_5F00_4Port.s4p

  • 0 in reply to Anilkv
    Intellectual 340 points

    Hello Anil,

    Thank you for the S4P file, it is very useful.

    If you don't mind I have two additional questions:

    1. In the TRF1208 schematic diagram below, is it correct to consider the 2 feedback resistors to be in the order of 240 Ohm?
    2. Instead of the noise figure (NF) of about 7dB you provide in the datasheet, would it be possible to provide me with some e_n & i_n spectral noise density source equivalent ? From the NF and neglecting I_n, I have found  e_n=1.7nV/sqrt(Hz). Is this a good approximation ?
  • +1 in reply to Nicolas Schlumpf
    TI__Prodigy 620 points

    Hello Nicolas,

    Sorry for the delay. Your guesses are close. The feedback resistor is about 250-ohm. The noise voltage e_n = 1.3nV/Rt.Hz.