[time-nuts] Flicker Noise Reduction

[Bruce Griffiths]

Attached is the block diagram of the receiver in essence an amplifier for which the effective input is gated/chopped on and off by turning the amplifier input FET on and off.

Bruce
> On 19 November 2020 at 16:15 "Richard (Rick) Karlquist" <richard at karlquist.com> 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
> 
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