LT1014: stability for attenuator application

Hi Frank,

we definitely need a schematic from you

It should also include information about what load is connected to the output of LT1014. I mention this because capacitive loads can make trouble and may need a phase lead compensation in the feedback loop of LT1014.

Kai

hey Frank, eventually you might want a TINA LT1014 sim, there a 3 diff. models in V11 library - pick one, 

Also, here is a more recent discussion of attenuators, you can always get them stable even if you start out oscillating. 

https://www.planetanalog.com/are-inverting-attenuators-with-voltage-feedback-op-amps-inherently-unstable-and-why-might-you-want-to-apply-them-insight-11/#

Hi Frank1,

We definitely need to see a schematic for your LT1014 based attenuator circuit as Kai mentioned. The LT1014 is a unity-gain stable op amp and even though you plan to apply it as an attenuator having a gain less than 1V/V, the circuit noise gain will be slightly higher than 1 V/V. Therefore, unless there are added capacitances at the op amp output, or at the op amp input summing junction, it is probable that the LT1014 will remain stable.

Once we see your schematic to make a better determination.

Regards, Thomas

Precision Amplifiers Applications Engineering

Hello, Frank.

On june 7th, the circuit diagram was replied to by email.

I ask for futher answers.

Thanks.

Hi Frank,

Did you receive the schematic for the LT1014 attenuator circuit from Innbeom? If you did and it can't be shared on the e2e, then provide it to me via the TI internal email. Otherwise, please post it here on the forum where everyone who has shown interest in this thread can review and comment on it.

Regards, Thomas

Precision Amplifiers Applications Engineering

Hello

Thank you for your response,Thomas Kuehl.
Can I send the schematic to you via email and discuss this issue in private?
Due to the schematic is confidential, and I can not post it in public forum.

Hello Innbeom,

Please send me an e2e friend request. Once I accept your request you will be able to contact me confidentially. We can exchange email addresses.

Regards, Thomas

Precision Amplifiers Applications Engineering