Rocksolid Light

Welcome to novaBBS (click a section below)

mail  files  register  newsreader  groups  login

Message-ID:  

Machine Always Crashes, If Not, The Operating System Hangs (MACINTOSH) -- Topic on #Linux

tech / sci.electronics.design / Has anybody tried this transimpedance amplifier?

SubjectAuthor
* Has anybody tried this transimpedance amplifier?Jean-Pierre Coulon
`* Re: Has anybody tried this transimpedance amplifier?John Larkin
 `* Re: Has anybody tried this transimpedance amplifier?Jean-Pierre Coulon
  `- Re: Has anybody tried this transimpedance amplifier?Phil Hobbs

1
Has anybody tried this transimpedance amplifier?

<655634bc$0$19669$426a74cc@news.free.fr>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=131943&group=sci.electronics.design#131943

  copy link   Newsgroups: sci.electronics.design
Path: i2pn2.org!i2pn.org!weretis.net!feeder8.news.weretis.net!proxad.net!feeder1-2.proxad.net!cleanfeed3-b.proxad.net!nnrp3-2.free.fr!not-for-mail
Newsgroups: sci.electronics.design
Date: Thu, 16 Nov 2023 16:26:52 +0100
From: cou...@cacas.pam.oca.eu (Jean-Pierre Coulon)
Subject: Has anybody tried this transimpedance amplifier?
User-Agent: Alpine 2.21.999 (WNT 260 2018-02-26)
MIME-Version: 1.0
Content-Type: text/plain; format=flowed; charset=US-ASCII
Lines: 8
Message-ID: <655634bc$0$19669$426a74cc@news.free.fr>
Organization: Guest of ProXad - France
NNTP-Posting-Date: 16 Nov 2023 16:26:53 CET
NNTP-Posting-Host: 192.54.176.195
X-Trace: 1700148413 news-3.free.fr 19669 192.54.176.195:20041
X-Complaints-To: abuse@proxad.net
 by: Jean-Pierre Coulon - Thu, 16 Nov 2023 15:26 UTC

https://www.newport.com/p/70710.

Is the input current noise lower than that of the LT1028 below 1 kHz?

Regards,
--
Jean-Pierre Coulon

Re: Has anybody tried this transimpedance amplifier?

<ghiclilvh0tcmh5am8ba2vc7bggnqbl6b5@4ax.com>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=131952&group=sci.electronics.design#131952

  copy link   Newsgroups: sci.electronics.design
Path: i2pn2.org!i2pn.org!weretis.net!feeder6.news.weretis.net!border-2.nntp.ord.giganews.com!nntp.giganews.com!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail
NNTP-Posting-Date: Thu, 16 Nov 2023 17:01:27 +0000
From: jl...@997PotHill.com (John Larkin)
Newsgroups: sci.electronics.design
Subject: Re: Has anybody tried this transimpedance amplifier?
Date: Thu, 16 Nov 2023 09:00:59 -0800
Organization: Highland Tech
Reply-To: xx@yy.com
Message-ID: <ghiclilvh0tcmh5am8ba2vc7bggnqbl6b5@4ax.com>
References: <655634bc$0$19669$426a74cc@news.free.fr>
X-Newsreader: Forte Agent 3.1/32.783
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Lines: 13
X-Trace: sv3-nucmNCqScZzlzW7SoDwL00blUOfoCulaACdmGJx3k1m0zhCel5X+qxhbHTUIpB14G+zGpUy6JUU+f/5!V2rZJKnYiU/ZtBI/6iVCnEv6NvG5CeNv5EaS/vhy9GkY5ZGK5fBjMo5WOs4GTPNEDsE6ez0L4TuX!MvtieA==
X-Complaints-To: www.supernews.com/docs/abuse.html
X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
X-Postfilter: 1.3.40
 by: John Larkin - Thu, 16 Nov 2023 17:00 UTC

On Thu, 16 Nov 2023 16:26:52 +0100, Jean-Pierre Coulon
<coulon@cacas.pam.oca.eu> wrote:

>https://www.newport.com/p/70710.
>
>Is the input current noise lower than that of the LT1028 below 1 kHz?
>
>Regards,

You can buy opamps with noise less than 1 fA/rthz.

LT1028 is bipolar, 1000x that noise.

Re: Has anybody tried this transimpedance amplifier?

<65567f60$0$4354$426a74cc@news.free.fr>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=131956&group=sci.electronics.design#131956

  copy link   Newsgroups: sci.electronics.design
Path: i2pn2.org!i2pn.org!weretis.net!feeder8.news.weretis.net!proxad.net!feeder1-2.proxad.net!cleanfeed1-a.proxad.net!nnrp1-2.free.fr!not-for-mail
Newsgroups: sci.electronics.design
Date: Thu, 16 Nov 2023 21:45:20 +0100
From: cou...@cacas.pam.obs-nice.fr (Jean-Pierre Coulon)
Subject: Re: Has anybody tried this transimpedance amplifier?
In-Reply-To: <ghiclilvh0tcmh5am8ba2vc7bggnqbl6b5@4ax.com>
References: <655634bc$0$19669$426a74cc@news.free.fr> <ghiclilvh0tcmh5am8ba2vc7bggnqbl6b5@4ax.com>
User-Agent: Alpine 2.23 (WNT 453 2020-06-18)
MIME-Version: 1.0
Content-Type: text/plain; format=flowed; charset=US-ASCII
Lines: 9
Message-ID: <65567f60$0$4354$426a74cc@news.free.fr>
Organization: Guest of ProXad - France
NNTP-Posting-Date: 16 Nov 2023 21:45:20 CET
NNTP-Posting-Host: 77.205.228.62
X-Trace: 1700167520 news-2.free.fr 4354 77.205.228.62:58664
X-Complaints-To: abuse@proxad.net
 by: Jean-Pierre Coulon - Thu, 16 Nov 2023 20:45 UTC

On Thu, 16 Nov 2023, John Larkin wrote:

> You can buy opamps with noise less than 1 fA/rthz.

The AD549 has a promising current noise. I must experiment because of is
undocumented voltage noise at the frequencies I want.

--
Jean-Pierre Coulon

Re: Has anybody tried this transimpedance amplifier?

<41ab0b27-8f0d-63a6-fc33-bd94ea042128@electrooptical.net>

  copy mid

https://www.novabbs.com/tech/article-flat.php?id=131957&group=sci.electronics.design#131957

  copy link   Newsgroups: sci.electronics.design
Path: i2pn2.org!i2pn.org!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!feeder.usenetexpress.com!tr3.iad1.usenetexpress.com!69.80.99.23.MISMATCH!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail
NNTP-Posting-Date: Thu, 16 Nov 2023 21:37:59 +0000
Subject: Re: Has anybody tried this transimpedance amplifier?
Newsgroups: sci.electronics.design
References: <655634bc$0$19669$426a74cc@news.free.fr> <ghiclilvh0tcmh5am8ba2vc7bggnqbl6b5@4ax.com> <65567f60$0$4354$426a74cc@news.free.fr>
From: pcdhSpam...@electrooptical.net (Phil Hobbs)
Message-ID: <41ab0b27-8f0d-63a6-fc33-bd94ea042128@electrooptical.net>
Date: Thu, 16 Nov 2023 16:37:58 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.0
MIME-Version: 1.0
In-Reply-To: <65567f60$0$4354$426a74cc@news.free.fr>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Lines: 40
X-Trace: sv3-EGcwm+HCCD4TwiHdTPqYGc87Yk2QCcElXSkxjTjzZ3aXA+HDOY8hlDdp8blE9qasMBOE8rRAboLgMga!BLEQTdJeU4rztIsSpNL4j123+FcU0QPn38xFxs/ogZCzXCNTjM0wWItPvw3ntZB8BZ0ZgpF2/URg!023qDUzQPo2VmBI2hKBwfBA=
X-Complaints-To: www.supernews.com/docs/abuse.html
X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
X-Postfilter: 1.3.40
 by: Phil Hobbs - Thu, 16 Nov 2023 21:37 UTC

On 2023-11-16 15:45, Jean-Pierre Coulon wrote:
> On Thu, 16 Nov 2023, John Larkin wrote:
>
>> You can buy opamps with noise less than 1 fA/rthz.
>
> The AD549 has a promising current noise. I must experiment because of is
> undocumented voltage noise at the frequencies I want.
>

If you post a bit more about what you're actually trying to measure, we
can probably be more help.

A TIA with 4 pA/sqrt(Hz) noise, 100 kHz bandwidth, and 10**9 ohms
transimpedance will have an output noise floor of

E_N ~ 4e-12*1e9*sqrt(1e5 * pi/2) = 1.6 Vrms.

[The pi/2 is the ratio of the noise bandwidth of a 1-pole rolloff
(1/4RC) to its 3-dB bandwidth (1/2piRC).]

Viewed on an oscilloscope, that'll look like a 6-V wide stripe down the
middle of the display, with outliers up to +-5V at least.

Not exactly your state-of-the art low noise amplifier!

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

1
server_pubkey.txt

rocksolid light 0.9.81
clearnet tor