• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 48 subscribers
  • Views 366 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMH5401: differential impedance 100ohm input

user5163865
Genius 3800 points
Part Number: LMH5401
Other Parts Discussed in Thread: TINA-TI

Hi,

I tested D/S Fig.57 (Gain4) with TINA-TI.
If the output impedance of the differential signal source = 0 ohms, the output will be gain 4.
Our customer set the output impedance of the differential signal source to 100ohm as shown in Fig.57.
It may be natural, but the simulation will reduce the gain.

In the real case, their signal source is also 100ohm differential.

Is it okay to design the actual machine as shown in Fig.57?
The customer intends to change his Rg = 49.9ohm to 0ohm as the simulation will lower the Gain.
Since this method is different from normal design, could TI give me some advice?

LMH5401 - 23-02-20.TSC

Best regards,

Hiroshi

  • 0
    TI__Expert 3780 points

    Hi Hiroshi, 
         Yes it works the way you simulated if you have ideal 100ohm output impedance but Zo varies with frequency. I recommend to check with customer what their source is and What's the range of frequency band they are operating at? 

    Regards,
    Hruday

  • 0 in reply to Hruday Kumar Mudireddy
    Genius 3800 points

    Hi Hruday-san,

    Sorry for the late reply.
    I didn't understand the frequency characteristics of impedance correctly.

    After explaining your response to the customer, this inquiry has been resolved.

    Regards,
    Hiroshi