[time-nuts] Flicker Noise Reduction

[Bruce Griffiths]

Its just another variation on the principle of the Dicke radiometer.
In their case the amplifier input device is turned off periodically by modulating its gate bias.
https://www.engr.colostate.edu/ece/faculty/reising/pdf/journals/Ogut_et_al_T-TST_2020.pdf

Bruce

> On 19 November 2020 at 12:38 Attila Kinali <attila at kinali.ch> wrote:
> 
> 
> On Wed, 18 Nov 2020 19:13:00 +0000 (UTC)
> Bruce Hunter via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> > Can anyone who subscribes to these transactions report on this?  I dropped my subscription.
> > In this letter, a novel 1/f noise mitigation technique is presented to improve the receiver 1/f noise performance of a 670 GHz receiver. 
> 
> The paper in question is:
> "A Novel 1/f Noise Mitigation Technique Applied to a 670 GHz Receiver",
> by Ogut et al.
> https://doi.org/10.1109/TTHZ.2020.3036179
> 
> The description is extremely vague, but I think what they are doing
> is modulating the gain of the first LNA stage in an amplifier chain
> to get information on the total gain of the chain and correct for it.
> Which would make it basically a fancy chopper-amplifier that operates
> on the gain instead of the offset voltage.
> 
> 			Attila Kinali
> 
> -- 
> The driving force behind research is the question: "Why?"
> There are things we don't understand and things we always 
> wonder about. And that's why we do research.
> 		-- Kobayashi Makoto
> 
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