Discrete amplifiers are always less noisy than integrated amplifiers.
If you want really low noise design a one with JFETs and Bipolar transistors.
I am trying to understand the contribution to phase noise by the opamps.
Perhaps the "threshold" is shifting and amplifier is being driven to
saturation?
I am new to this group but have had lots of RF experience and weak signal
detection experience.
73
Bill wa4lav
Date: Tue, 28 Feb 2012 07:34:09 -0500
From: Bob Camp <li...@rtty.us>
Hi
Very cool. How much power can you run through the device? Put another way,
if you drive it with +13 dbm do all the numbers get 5 db better?
I doubt very many of us will be worrying about weather it's below -153 at
10 Hz or not?
Bob
On Feb 28, 2012, at 5:42 AM, Bruce Griffiths wrote:
> The attached plot indicates the phase noise performance obtainable with
a wideband FET (OPA653) input opamp.
> With a 10MHz +9dBm input, the phase noise floor is around -163dBc/Hz at
1kHz offset and around -154dBc/Hz at 10Hz offset.
> A quieter test source would be useful particularly for offsets below 10Hz.
>
> Bruce
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William L. Fuqua III P.E.
Sr. Electrical Engineer
CP 177 Chemistry Physics Building
Department of Physics and Astronomy
University of Kentucky
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e-mail: wlfuq...@uky.edu
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