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LMH6554: Help! I can't run TINA-TI Transient Analysis past 13MHz

Pete Reardon
Prodigy 10 points
Part Number: LMH6554
Other Parts Discussed in Thread: TINA-TI

Hello,

I am trying to use TINA-TI to simulate some Fully Differential Amplifiers (FDAs).  Specifically, I am interested in the LMH6554 FDA.  I download the LMH6554 TINA-TI reference design, I am able to run a Transient analysis.   So far so good.  However, when I increase the frequency of the “VG1” source from the default 10MEG to anything past 13MEG, the Transient analysis will not run.  Since my design requires 100 MHz signals, I need to get past this hiccup.  So, does anyone have any insight, as to how I can get past this hiccup?

-Thank You

  • TI__Expert 6050 points

    Hi Pete,

    I quickly threw together a circuit to simulate the LMH6554 in TINA-TI. I was able to produce a transient simulation for the 100MHz signal that you desire. I have attached that file below.

    LMH6554_E2E.TSC

    I am unsure as to why you are not able to simulate with the same results as myself. If you are able to provide the TINA file you are trying to simulate and what version of TINA you are using, I may be able to provide more insight as to the cause. Also, are you seeing any errors when you try to run your simulation past 13MEG?

    Thanks,

    Nick

  • Prodigy 10 points

    LMH6554 AC-coupling example.TSC

    Nick,

    Thanks for the prompt reply.  I have attached the reference design, as provided by TI.  Also, I am using TINA-TI... Version 9.3.100.244 SF-TI

    Thanks,

    Pete

  • in reply to Pete Reardon
    TI__Expert 6050 points

    Hi Pete,

    I took a look at your TINA file and have figured out why you were not able to simulate the circuit properly.

    • You need to have a voltage connected to the Ven pin of at least 2.5V but typically set to V+
    • The FB+ and FB- must have connections. Section 6 of the datasheet shows how the feedback pins should be connected.

    I will also include the updated TINA file with these corrections and now 100MHz can be simulated. Please let me know if you have any other questions.

    LMH6554 AC-coupling example_updated.TSC

    Thanks,

    Nick