LMH13000: VSET Bandwidth

Giora Eytan

Expert 1325 points

Part Number: LMH13000

Hello,

Want to use the LMH13000 as a laser driver pulse shaping.

To do this I want to use the VSET input.

I wonder what is the Bandwidth of this input.

Regards,

Giora

10 months ago

0 Jyothi Sanganna 10 months ago

TI__Prodigy 270 points

Hello Giora,

Thank you for your question.
The VSET input bandwidth for the LMH13000 is approximately 800kHz. For additional detail, please refer to the device datasheet, specifically Figure 5-21. VSET to IOUT Bandwidth Response, which illustrates the typical behavior over frequency.

If you have further questions or need assistance with your laser driver pulse-shaping application, feel free to follow up.

Regards,

Jyothi
Texas Instruments

0 Giora Eytan 10 months ago

Expert 1325 points

Hello Sanganna,

I am using the spice of the LMH13000 ( LMH13000_V0p2.lib)

to simulate the Iout as a function of VSET - input a pulse with rise time of 1ns, Rise time of IOUT is < 2ns.

Not agreed with the data sheet.

Please advise.

Regards,

Giora

0 Jyothi Sanganna 10 months ago in reply to Giora Eytan

TI__Prodigy 270 points

Hello Giora Eytan,

Apologies for the delayed response.

To understand the discrepancy you are observing between the LMH13000 SPICE model and the datasheet specifications, could you please share the schematic and simulation setup you are using (including load conditions, supply rails, and measurement points)?
This will help us review the conditions under which the IOUT rise time is being measured and provide accurate guidance.

Thank you for your patience.

Regards
Jyothi

0 Giora Eytan 9 months ago in reply to Jyothi Sanganna

Expert 1325 points

Hello Jyothi,

I attached the LMH13000_pulse shape.TSC

.LMH13000_pulse shape.TSC

also the signals:

Regards,

Giora

0 Jyothi Sanganna 9 months ago in reply to Giora Eytan

TI__Prodigy 270 points

Hello Giora,

Thank you for sharing the TSC model and the signal plots. I’ve reviewed the model and noticed a few issues that need to be addressed on our side. We are currently working on fixing them and will update you shortly with our findings.

Thanks and regards,
Jyothi

0 Giora Eytan 9 months ago in reply to Jyothi Sanganna

Expert 1325 points

Hello,

Any progress?

Regards,

Giora

0 Jyothi Sanganna 9 months ago in reply to Giora Eytan

TI__Prodigy 270 points

Hello Giora,

Thank you for your patience. The VSET to IOUT bandwidth has not been updated in the TSC model. At this time, you may proceed by using the device from 1MHz onward.

We are actively working on updating the model and will share the revised version once it becomes available.

Best Regards,
Jyothi

0 Jyothi Sanganna 7 months ago in reply to Jyothi Sanganna

TI__Prodigy 270 points

Hello Giora Eytan

Thank you for your patience.
Please find the attached updated TINA-TSC model with VSET to IOUT bandwidth implemented. This revision includes the necessary updates.

Kindly review the model and let us know if you encounter any issues or require further clarification.
LMH13000_V1p1_Release_TINA.zip

Best Regards,
Jyothi

Amplifiers

Amplifiers forum

LMH13000: VSET Bandwidth