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Original question:

SN65DP141: SN65DP141 / IBIS model

SN65DP141: Signal Integrity

JIYONG AN
Prodigy 10 points
Part Number: SN65DP141

Tool/software:

Hi, 

As we can see in the products page, the S-parameters contain mostly with DCgain set 0 (-6 dB) only.

We can use DP141 with many options such as RX gain, Equalization, Tx gain and etc but cannot pre-simulate it.

So, is there any more s-parameters or ibis file that TI can share?

We want check consistency between the our custom board using DP141 so we need more s-parameter or ibis files.

Can u provide it?

  • 0
    TI__Guru**** 177171 points

    Hi,

    The DP141 s-parameter was done through actual lab measurement, not through the extrapolation from simulation.

    With the lab measurement, the DP141 DC_GAIN and AC_GAIN are set through the RX_GAIN pin and there are only three possible RX_GAIN levels -> High, Low, and Hi-Z.

    Table 8-2 lists the DC_GAIN and AC_GAIN associated with each level of RX_GAIN as shown below. I mapped the DC_GAIN and AC_GAIN setting with the actual value.

    The only one I see missing from the s-parameter model is the last one on the list, but that is just changing the linearity range between 600mV (VOD = 0) and 1200mV (VOD =1)

     So they can use the VOD = 0 s4p for their simulation and make sure the input signal amplitude stays within the 600mV linearity range to simulate the DP141 RX response.

    Thanks

    David 

  • 0 in reply to David (ASIC) Liu
    Prodigy 10 points

    Hi. What about the the TX DC Gain?
    In Figure 8-1, TX_GAIN is also a parameter that we can control and it's also written in Table 8-6.
    We can control the TX_GAIN in board and is there any possible way that we can also simulate TX_GAIN in simulation?

    Table 8-2 show only the EQ DC/AC gain, not TX gain.

  • 0 in reply to JIYONG AN
    TI__Guru**** 177171 points

    Hi

    TX_DC_GAIN is the same as the VOD and it sets the linearity range. When TX_DC_Gain = 0, it sets the output linearity range to 600mVpp. When TX_DC_Gain = 1, it sets the output linearity range to 1200mVpp.

    Thanks

    David