On 11/18/20 4:59 PM, Richard (Rick) Karlquist wrote:
I suspect that, whatever this is, only applies to 1/f mechanisms
specific to THz, based on the last sentence. One of my
former clients did a PhD at Stanford on 1/f noise and
his dissertation certainly had no magic bullets to
mitigate 1/f noise.
There is some frequency, which I am fairly sure is less
than a THz, above such that the usual equations for so-called
Johnson noise no longer apply. FWIW.
I don't blame you for not wanting to invest $15 or whatever it
is only to see it and be disappointed. Are you sure the
author(s) hasn't published a version of it on his own web page?
I am guessing that this might be a reinvented transposed gain
oscillator (TGO) used for the LO, where the LO is the original
source of the noise.
Rick N6RK
On 11/18/2020 11:13 AM, Bruce Hunter via time-nuts 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. Time
domain 1/f noise corrected samples are compared with samples obtained
without the correction. Spectral domain analysis shows that the 1/f
noise mitigation method improves the receiver noise performance by 19
dB in the receiver under test. The presented 1/f noise mitigation
technique can be applied to any direct-detection receiver in the THz
frequency range.Published in: IEEE Transactions on Terahertz Science
and Technology ( Early Access )Page(s): 1 - 1Date of Publication: 06
November 2020
The authors are at JPL, Northrup Grumman, and Colorado State, Ft Collins.
Since it was funded by NASA, it will show up on JPL's tech report server
in a bit.
I'd send the author mehmet.o...@jpl.nasa.gov an email asking for a
preprint copy. He should be happy to send it to you. Let me know if you
need help - I've met some other co-authors (i.e. Al Tanner) but don't
know them well.
You might also check Colorado State's website - they might have a
preprint up (or on arXive).
It's targeting 670 GHz receivers for cubesats (TWICE is the project name)
Not a Dicke Switch:
The addition of a Dicke switch is useful for reducing 1/f noise
in radiometers [5],[8]. However, only limited work on switches
has been done at THz frequencies [9]. This, in turn, makes
Dicke-switching architecture impractical for radiometry in the
THz range. Therefore, a significant need exists to address 1/f
noise in THz direct detection receivers
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
any switch inserted between the antenna and the low-noise
amplifiers will add high insertion loss at these high frequencies,
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