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 <att...@kinali.ch> wrote: > > > On Wed, 18 Nov 2020 19:13:00 +0000 (UTC) > Bruce Hunter via time-nuts <time-nuts@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
