I'm working on a project in which I am analogly processing ultra low signals. The phase, harmonics and signal shape are critical to circuit functions. The signal on the input comes from an antenna type device, so as you can guess, it picks up a ton of noise.
My minimum input voltage is 2uV AC ranging anywhere from 10-10kHz.
The circuit applies a gain of 1000 and does some other jazz to the signal. The problem is being able to measure the input signal and compare it with the output.
I'm even having trouble measuring the output properly as even my Tektronics scope does not go anywhere near that low. I'm currently using a 6 1/2 digital bench DMM but I can only measure amplitude.
In noisy, low voltage situations like this, how do I go about measuring this signal?
If I amplify everything more I fear the noise to signal ratio will be so large I will only see noise anyway.
Would I need to use a band pass?