LMH5401: Differential TIA Stability Simulation

Thi Le

Part Number: LMH5401
Other Parts Discussed in Thread: TINA-TI

Hello,

I am trying to simulate and compensate a differential TIA and ADC driver on Tina-TI. What is the best way to set up a differential input for the simulation to run properly? Would it be what I currently have right now?

Thank you,
Thi Le

over 1 year ago

0 Thi Le over 1 year ago

Prodigy 10 points

Caught a few mistakes in my original simulation schematic. Updated one below.

0 Hruday Kumar Mudireddy over 1 year ago in reply to Thi Le

TI__Expert 3870 points

Hello Thi,

I will get back to you on this next week.

Thanks,

Hruday

0 Michael Steffes over 1 year ago in reply to Thi Le

Guru 48395 points

Hey Thi, the key element in a TIA simulationis the source impedance, usually just a capacitance. You would need to provide that.

0 Thi Le over 1 year ago in reply to Michael Steffes

Prodigy 10 points

Hi Michael, sorry for the delay in response.

I have updated my simulation to include the PD capacitance and trace capacitance. I am using a 0.9pF FB capacitor to improve stability, calculated using a TI app note. Running the AC analysis shows instability. Am I running the simulation correctly to perform a stability analysis? If not, then what would be the correct way to do so? Thank you so much for your time!

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LMH5401: Differential TIA Stability Simulation