Anybody experienced in using a prescaler as a wideband preamp?
Hi group,
I know my question is time-nuts of topics but as I know
there are some really skilled GHz specialists on the group
I like to ask whether somebody made experience
using a prescaler MMIC (i.e. up to 12GHz) as a
very wideband preamp?
Thanks for answering
Peter
Hi Peter,
I don't think you can use a prescaler as an amplifier - for the latter
its output signal must be of the same frequency.
With best regards,
Vadim
On 28.07.2011 1:38, Peter Krengel wrote:
Hi group,
I know my question is time-nuts of topics but as I know
there are some really skilled GHz specialists on the group
I like to ask whether somebody made experience
using a prescaler MMIC (i.e. up to 12GHz) as a very wideband preamp?
Thanks for answering
Peter
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I agree this does not make sense. There is a divider in the way so its not a
preamp.
On Wed, Jul 27, 2011 at 6:26 PM, Vadim Demidov QRP@peterstar.ru wrote:
Hi Peter,
I don't think you can use a prescaler as an amplifier - for the latter its
output signal must be of the same frequency.
With best regards,
Vadim
On 28.07.2011 1:38, Peter Krengel wrote:
Hi group,
I know my question is time-nuts of topics but as I know
there are some really skilled GHz specialists on the group
I like to ask whether somebody made experience
using a prescaler MMIC (i.e. up to 12GHz) as a very wideband preamp?
Thanks for answering
Peter
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Hi
To answer a slightly different question:
Combining a wideband MMIC preamp and a prescaler can be tricky. It's easy to
get it to work and hard to get it to work well. Finding a MMIC preamp that
makes a good limiter is only one of the challenges.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Peter Krengel
Sent: Wednesday, July 27, 2011 5:38 PM
To: time-nuts@febo.com
Subject: [time-nuts] Anybody experienced in using a prescaler as a
widebandpreamp?
Hi group,
I know my question is time-nuts of topics but as I know
there are some really skilled GHz specialists on the group
I like to ask whether somebody made experience
using a prescaler MMIC (i.e. up to 12GHz) as a
very wideband preamp?
Thanks for answering
Peter
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Paul Swed writes:
I agree this does not make sense. There is a divider in the way so its not a
preamp.
I'll bite: what does a small-signal model of a prescaler look like?
As a guess, it might be a (flat? highpass?) attenuator (with a great
deal of loss) up to some threshold amplitude, then above that one
would get the divided output.
But that's with a pure-tone stimulus. Perhaps a prescaler could be
made to act as a kind of preamp-plus-mixer by pumping it with an LO
just at threshold, then adding in the input signal. Likely enough,
though, there are better ways to accomplish whatever the system-level
goal is.
Cheers,
Peter
Hi
Small signal wise a prescaler looks like a divider.
Below some threshold you (hopefully) get nothing. Above that point you get
various sorts of garbage (which could include self oscillation) unrelated to
the input frequency. Past another point you get an increasingly solid divide
out. The magic points are level, load impedance, source impedance,
temperature, and supply voltage dependant.
Bob
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Peter Monta
Sent: Thursday, July 28, 2011 4:15 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Anybody experienced in using a prescaler as a
wideband preamp?
Paul Swed writes:
I agree this does not make sense. There is a divider in the way so its not
a
preamp.
I'll bite: what does a small-signal model of a prescaler look like?
As a guess, it might be a (flat? highpass?) attenuator (with a great
deal of loss) up to some threshold amplitude, then above that one
would get the divided output.
But that's with a pure-tone stimulus. Perhaps a prescaler could be
made to act as a kind of preamp-plus-mixer by pumping it with an LO
just at threshold, then adding in the input signal. Likely enough,
though, there are better ways to accomplish whatever the system-level
goal is.
Cheers,
Peter
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
On 07/27/11 10:38 PM, Peter Krengel wrote:
Hi group,
I know my question is time-nuts of topics but as I know
there are some really skilled GHz specialists on the group
I like to ask whether somebody made experience
using a prescaler MMIC (i.e. up to 12GHz) as a very wideband preamp?
Thanks for answering
Peter
I'm puzzled why you would want to consider using a chip for a purpose it was
clearly never designed, and has almost zero hope of working.
An amplifier is supposed to faithfully reproduce the signal, with minimal
distortion.
A prescaler is supposed to totally change the frequency.
I'd be interested to know what makes you think its even worth considering.
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