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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: R & C tempco repeatability
Date: Wed, 11 Sep 2002 14:43:18 +0200
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Organization: Guest of ProXad - France
NNTP-Posting-Date: 11 Sep 2002 14:41:43 MEST
Still for my 100kHz IF amplifier for which I still want really stable phase
The requirements are such that low tempcos of R and C are not low enough to
guarantee the specs for the active filters stages.
Of course I can stabilize the temperature, or measure it and then apply a
measured tempco to correct the value, but this is an added level of
complexity I'd prefer not to have.
For the active filters I can find at least a simple structure (Fliege) for
which pairs of identical components provides opposite sensitivities for the
Q and center freq, hence perfectly summing to zero *if* identical components
have the same tempcos.
Unfortunately, all the low tempco components I've found are specified +/-
The way I understand that is that the manufacturer guarantee the tempco
value for all the components range to be within the given band.
But I guess that components value has some influence on the tempco versus
value distribution, and the point that really interest me is how identical
value components tempcos are related.
Anyone having some experience with this component tempco repeatability ?
How close can they come ?
The components range is for an RC product of 1.59uS
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