Compiler/OPA838: I want to amplify the 5mv voltage signal.

Hi,

why opening a new thread?

Kai

hi,

The signal that opa855 output is so small. So I want to use second amplifier to amplify it. I want to make gain :100V/V.

Do you have some good suggest?

Same suggestion as the other thread, 2 OPA855's each at a gain of 10. Or, since you are AC coupled and probably do not care about DC precision, maybe two current feedback stages - say OPA695's at gain of 10 each

I use opa695 and amplify it to almost 100mv. Can you give me some advice to amplify 10 gain?

Thank you.

here's the simulation.opa855-5ns-5pf-3.26mv-2ndamplify3.TSC

Can you tell me how to use two amplifiers to undistorted amplified signal.

Hello,

To being you cannot use 10V supply on the OPA855 as you are in the second stage. Can you clarify what are the main issues you are trying to address?

Best,

Hasan Babiker

Thank you for your answer. My issue have solved.

I amplfy the signal to 280mv. Now I want to use the voltage comparator to identify 260mv.Do you have some recommended comparator can help me identify it.

Hello,

I'll move this post to the comparator group to see if they have any recommendations. Can you provide the comparator specs needed?

Best,

Hasan Babiker

Can you please provide more input about your circuit?

What supply voltage would the comparator be operating at? Are there speed/power requirements you have?

When you amplify the signal to 280mV, are you saying you would like the comparator to detect and change output state if the input signal is > 260mV?

Regards,
Jonny