LMH6505: output offset in sim ~40mV

Michael Doyle

Part Number: LMH6505
Other Parts Discussed in Thread: TINA-TI

Tool/software:

When I simulate a circuit using the LMH6505, I get a 40mV offset at the output. This seems to be independent of gain voltage. My question: Is this real, and is it really independent of gain? I think we can live with it as long as the offset is no more than 40mV across gain voltage range. Circuit is attached (sim is in LTSpice, sorry).

7 months ago

0 Alec Saebeler 7 months ago

TI__Mastermind 23399 points

Hello Michael,

Please allow me some time to reconstruct your circuit in PSPICE and/or TINA-TI (do not worry, I do not mind ). Let me check on whether you are seeing a real quantity for offset voltage or if it is related to the model or LTSpice simulation.

Best,

Alec

0 Michael Doyle 7 months ago in reply to Alec Saebeler

Intellectual 710 points

Great! Thanks, Alec. If this checks out, I'll get a breadboard built. Cheers!

0 Shreenidhi Patil 7 months ago in reply to Michael Doyle

TI__Expert 4086 points

Hey Michael , also please do look at OPA836A from TI which should be a cheaper , better precision replacement against ADA4805-1.

as discussed on other thread please do share your contact we want to get in touch with you regarding our development of zero offset VGA.

0 Michael Doyle 7 months ago in reply to Michael Doyle

Intellectual 710 points

Hi Alec - any update?

Cheers!

0 Alec Saebeler 7 months ago in reply to Michael Doyle

TI__Mastermind 23399 points

Hello Michael,

I am working on this for you; I should have a complete circuit to simulate tomorrow. I arrived back late from work travel yesterday and had to catch-up today on work overall.

Best,
Alec

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LMH6505: output offset in sim ~40mV