Part Number: LMH6401
I need to convert a single ended signal to a differential signal. However, I do not require gain. Additionally, this is a highly sensitive measurement, so low noise figure is critical. The only SE to differential converters I can find are amplifiers with quite a bit of gain. With the gain, I end up having to add attenuation (both before and after amplification), which greatly reduces SNR.
Is there a SE to differential converter with no gain and low noise figure?
I would suggest that you could look at the THS4131 as an option. This has an input referred noise of 1.3nV/rtHz. To figure out the exact noise figure I need to know the impedance of your source. Is it 50 Ohms?
Jacob Freet High Speed Amplifiers
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In reply to Jacob Freet:
Thank you for the great suggestion. I see that the gain is tunable and can be set to 1 if desired. That is exactly what we are looking for.
I should have given more information in my question though, I apologize.
We are indeed operating at 50 Ohms. However, the THS4131 unfortunately does not have enough bandwidth. Ours is a broadband application, DC to 6.5 GHz. Sorry for not clarifying that up front. Are there similar components with the bandwidth we need?
In reply to Brandon Buckley:
Are you seriously DC to 6.5GHz - that DC part is hard in a 6.5GHz high end - and normally, you need some gain to get a low input noise figure. There are some specialized modules that do that span, but virtually the entire 6.5GHz RF amplifier world is AC coupled.
In reply to Michael Steffes:
found one, but I am sure there are a few others,
The LMH5401 or LMH6401 are going to be the closest devices we have.
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