Hi Time Nuts,
I have a need for a low phase noise, noise floor and noise figure amplifier
at 400MHz. I have tried some off-the-shelf 50 ohm amplifiers, the best of
which degrades phase noise by a couple dB. I'm working with a signal with
-172dBc/Hz PN, so not much tolerance for degradation he
On 1/9/20 5:38 PM, Lifespeed wrote:
Hi Time Nuts,
I have a need for a low phase noise, noise floor and noise figure amplifier
at 400MHz. I have tried some off-the-shelf 50 ohm amplifiers, the best of
which degrades phase noise by a couple dB. I'm working with a signal with
-172dBc/Hz PN,
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of
jimlux
Sent: Thursday, January 9, 2020 6:02 PM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] low phase noise, noise floor and noise figure
amplifier at 400MHz
So you've tried something
That's not possible at room temperature since thermal noise will limit the
residual PN to -180DbC/Hz with a noiseless amplifier and a +3dBm input.
Bruce
> On 10 January 2020 at 14:38 Lifespeed wrote:
>
>
> Hi Time Nuts,
>
>
>
> I have a need for a low phase noise, noise floor and noise fi
Am 10.01.20 um 03:01 schrieb jimlux:
On 1/9/20 5:38 PM, Lifespeed wrote:
Hi Time Nuts,
I have a need for a low phase noise, noise floor and noise figure
amplifier
at 400MHz. I have tried some off-the-shelf 50 ohm amplifiers, the
best of
which degrades phase noise by a couple dB. I'm workin
> Any suggestions on topologies, transistors, white papers, etc? I'm
> considering the NXP BFU590Q silicon bipolar transistor, which I have used
in
> a transformer feedback configuration at 100MHz with less than -180dBc/Hz
> PN.
You could take a look at the approach behind the option-K22 amplifie
o: "'Discussion of precise time and frequency measurement'" <
> time-nuts@lists.febo.com>
> Cc:
> Bcc:
> Date: Thu, 9 Jan 2020 22:23:23 -0800
> Subject: Re: [time-nuts] low phase noise, noise floor and noise figure
> amplifier at 400MHz
> > Any su
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of John
Miles
Sent: Thursday, January 9, 2020 10:23 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] low phase noise, noise floor and noise figure
am
ecise time and frequency measurement'" <
> > time-nuts@lists.febo.com>
> > Cc:
> > Bcc:
> > Date: Thu, 9 Jan 2020 22:23:23 -0800
> > Subject: Re: [time-nuts] low phase noise, noise floor and noise figure
> > amplifier at 400MHz
> > > Any s
I think one should recall that for very deep phase-noise numbers for
far-out noise, we cannot remove the suspicion of cross-correlation
cancellation problems have overstated the phase-noise levels. I've seen
both instrument makers and oscillator makes handwaving to protect the
values which so far i
Magnus,
Well you kindly explain what you mean by your comment "I've seen
both instrument makers and oscillator makes handwaving to protect the values
which so far is understood to be non-physical." , especially the
non-physical part.
While I can keep up with a lot of the discussions here, I will
Patrick,
I try to share what I have learned as generously as others before me
have done. Somewhere along the line I transitioned from noob to actually
know something and now, well, I can't claim complete lack of knowledge
anymore. But, I enjoy the many questions, as it forces me to think,
think an
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