[time-nuts] Flicker Noise Reduction

[jimlux]

On 11/18/20 7:15 PM, Richard (Rick) Karlquist wrote:
> 
> On 11/18/2020 5:27 PM, jimlux wrote:
> 
>> The proposed mitigation technique relies on tracking the
>> rapid gain variations in the radiometer due to 1/f noise and
>> correcting them by generating a baseline state in the first
>> amplification stage of the low noise amplifier (LNA). The
>> proposed 1/f noise mitigation method can be applied to any
>> receiver, but it is especially valuable for THz receivers since
> 
> I'm confused here.  My understanding of 1/f noise was
> that it was additive as in "AWGN".  Can you clarify this?
> You also imply it works for ANY receiver.  Now I'm REALLY
> confused.  Unless the "direct conversion receiver" is actually
> an envelope detector.  Then I think I see how it can work
> at any frequency.
> 
> Not arguing, just trying to understand :-)
> 
> Thanks.
> 
> Rick N6RK
I was just copying from the intro to the paper. I'll read it tomorrow.

My first glance is that they are talking about 1/f noise as gain 
variations, and stabilizing that. Maybe for THz amps that's a thing.