Thank you all for the input.
since I have 12v (or 15v) available
I will try the LT1027... looks promising, the so8
version with typ 2ppm/C... (or why not the can
version for 1ppm/C)
Application is OCXO reference for mmWave gear... I just
want the resulting 100's of GHz not to drift because of the
EFC volt. change as the ambient temperature changes :-(
Have a bunch of sources of freq. drift... At least this one
I think I can get rid off, to some extent.
Tks. Will report later.
Luis Cupido.
ct1dmk
On 1/7/2015 3:28 AM, Bruce Griffiths wrote:
Luis
If you have sufficient headroom (input supply> 7V or so) why not use a
buried zener reference chip like an LT1027?
These chips also have a noise reduction pin.
Otherwise a lower dropout bandgap reference like an LT1019 or similar
may be useful.
Bruce
On Wednesday, January 07, 2015 01:35:59 AM ct1dmk wrote:
Hi Bob, That is the issue, it doesn't.
(the 2,3 different types I would like to use none of them have it, so I will
be making a small pcb with the trimpot and the regulator and some
capacitors etc).
Luis Cupido.
ct1dmk
On 1/7/2015 1:09 AM, Bob Stewart wrote:
Does your oscillator have a VRef output? If so, use that instead of a
regulator. It's cleaner and usually temperature compensated.
Bob
From: ct1dmk<ct1...@gmail.com>
To: Discussion of precise time and frequency
measurement<time-nuts@febo.com> Sent: Tuesday, January 6, 2015
6:40 PM
Subject: [time-nuts] VC-OCXO EFC stability.
Hi,
With a multiturn pot and a 78L05 I can get a 0 to 5V EFC to tune
an OCXO on desired freq. But... maybe other voltage regulators
or other scheme have better temp stability than the old 78L05.
Before I crawl lost in new'ish fancy regulator land does anybody
know the killer solution/IC for this job ?
Luis Cupido
ct1dmk.
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