Rbe over temperature?

[Ian Fritz]

Grant --

Sorry, I don't understand your question. dVbe is the differential input
voltage to the converter. The output current is I ~ exp(-dVbe/(kT/q)). So at
the pitch corresponding to dVbe=0 there is no T dependence.  As the input
control voltage increases from this point dVbe becomes negative and the
pitch increases. The higher the pitch, the larger the temperature effect.
Similarily for decreasing control voltage (dVbe is positive, with more
temperature effect the lower the pitch.)

Hope this helps.

  Ian


----- Original Message -----
From: "Grant Richter" <grichter at asapnet.net>
To: <ijfritz at earthlink.net>; "Terry Michaels" <104065.2340 at compuserve.com>;
"synth" <synth-diy at node12b53.a2000.nl>
Sent: Monday, January 15, 2001 11:15 AM
Subject: Re: Rbe over temperature?


> The design uses an SSM2220, which is basically an F grade MAT-03.
>
> How much dVbe mis-match is tolerable?