LMH1297: SDI_IO+ and SDI_OUT+ S-Parameter

Masaru Tamai

Prodigy 235 points

Part Number: LMH1297

Hi,

We would like to simulate the return loss of the SDI port.

Please provide us with the following touchstone files and documentation of your measurement environment.

-SDI_IO+ (EQ Mode)

-SDI_IO+ (CD Mode)

-SDI_OUT+ (CD Mode)

Sincerely

over 5 years ago

0 Masaru Tamai over 5 years ago

Prodigy 235 points

Sorry, there was a mistake.

Correct : -SDI_OUT+

Incorrect : -SDI_OUT+ (CD Mode)

0 Nasser Mohammadi over 5 years ago in reply to Masaru Tamai

TI__Guru* 93570 points

Hi Masaru,

Please use link below to request access to the LMH1297 IBIS-AMI model.

https://www.ti.com/drr/opn/LMH1297-DESIGN

Regards,,nasser

0 Masaru Tamai over 5 years ago in reply to Nasser Mohammadi

Prodigy 235 points

Hi nasser,

I have a question about the LMH1297 IBIS-AMI model.

How should I connect the input port to reproduce the input port?

I am trying to connect the FR4 schematic, but it does not work.
-What is the S-para for In0.s4p?
-Analysis cannot be done because of rx_io3.s4p.
　(ADS2021 Update1)

Sincerely

0 Nasser Mohammadi over 5 years ago in reply to Masaru Tamai

TI__Guru* 93570 points

Greetings,

LMH1297 IBIS-AMI file has been validated using Keysight ADS software. Once you un-archive the project, please run the simulation without making any change.

1). Is this what you've done?

2). There is a user guide with the model as well. Please review this document as well. Simulation environment setup and result output eye diagrams are in the user guide.

Regards,,Nasser

0 Masaru Tamai over 5 years ago in reply to Nasser Mohammadi

Prodigy 235 points

Hi nasser,

I'm sorry.

I unarchived the file again and was able to simulate it.

I cannot find "rx(n)_term.s4p" mentioned in the user guide.

Is it a different file name?

rx_io3.s4p or rx_io.s2p ?

Sincerely

0 Nasser Mohammadi over 5 years ago in reply to Masaru Tamai

TI__Guru* 93570 points

Greetings Tamai-San,

I believe it is rx_io3.s4p file. This is termination network looking into the RX.

Regards,, Nasser

0 Masaru Tamai over 5 years ago in reply to Nasser Mohammadi

Prodigy 235 points

Hi nasser,

Thanks for the reply.

We are trying to reproduce "SDI_IO+ (EQ Mode)" as shown in the table in the datasheet.

We do not get good analysis results using the rx_io3.s4p file.

Using the rx_io.s2p file comes close, but is still not very accurate.

・What part of the device is the S-parameter in IO.s4p?
・IO.s4p is an S-parameter of what part of the device? - rx_io.s2p is an S-parameter of what part of the device?
・Is there something wrong with the way the snp file is connected?

Sincerely

0 Nasser Mohammadi over 5 years ago in reply to Masaru Tamai

TI__Guru* 93570 points

Greetings,

Please send me a friend request so we can discuss IBIS-AMI files for return loss purpose. We've done this simulation before and we can send you our archived files.

Regards,,nasser

0 Masaru Tamai over 5 years ago in reply to Nasser Mohammadi

Prodigy 235 points

Hi nasser,

I sent you a friend request.
We would like you to provide us with the archive files of your previous simulations.

Sincerely

Interface

Interface forum

LMH1297: SDI_IO+ and SDI_OUT+ S-Parameter