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What's all this Low Noise Amplifer stuff, anyhow?

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bartona

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I'm looking for a low noise amplifier to amplify some uV signals from 300kHz-1Mhz. It's for an NMR application. My questions are:

1. What exactly is inside a low noise amplifier?
2. Is it just a few transistors in CE, Cascode, etc topologies that have been "tweaked"?
3. Is it something that I could build on my own on a breadboard or dead-bugged?
4. If I found a low noise, precision op-amp that met the noise, frequency, and gain specs that I need, would that work just as well?

Thanks in advance,
-bartona
 

Dear Bartona
Hi
You can use AD620 or some other of products of Analog device company.
In first stage of those amplifiers is a differential amp with low noise Fets or mosfets with Zi approximation = very high(open circuit) . yes cascode has a good frequency response but it is large and hardly ever used in integrated circuits.(because that amp need capacitor and capacitor is large for Ic.
Best wishes
Goldsmith
 

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