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Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: Opamp GBW tempco ?
Date: Wed, 11 Sep 2002 14:54:47 +0200
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NNTP-Posting-Date: 11 Sep 2002 14:53:28 MEST
Kevin Aylward a écrit dans le message :
> "fred bartoli" wrote in message
> > Maybe a question for Kevin or Jim ?
> > For my 100kHz IF amplifier that has to have a really (really mean :
> > stable phase rotation at the (constant) IF frequency, I'm evaluating
> > sensitivity of all the components.
> > One point I don't have answer is the tempco of opamps.
> > The ones that I want to use are in the 100/200MHZ range, bipolar input
> > voltage noise).
> > Any order of magnitude for this tempco ?
> If the data sheet don't spec it, I reckon you have to bank on 20% to 50%
> or so at least as an open loop gain variation over temperature. Some
> might be better, it depends on how well all the gm stages have been
> biased with a PTAT current.
That is about 0.2% to 0.5% per °C and is pretty large regarding my needs. So
that means that I probably will have to measure it and account for in the
amplifier, and the situation may not be so bad if this tempco is fairly
Do you have some ideas about that ?
> Kevin Aylward
> SuperSpice, a very affordable Mixed-Mode
> Windows Simulator with Schematic Capture,
> Waveform Display, FFT's and Filter Design.
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