[sdiy] 2164 temperature compensation

[Rutger Vlek]

Dear list,

I'm working on a sawtooth oscillator for a new personal synth project and
have a question about temperature compensation with the 2164, as proposed
in the datasheet (Figure 11):
https://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf

I noticed that the proposed compensation scheme takes a bipolar CV input
(-5 to +5V) and generates a temperature compensated control signal for the
final exponentiator (VCA2) that is also bipolar in nature, centered around
the unity-gain point (0V) of the 2164. I wondered: was this chosen for
practical reasons, or does the temperature compensation (or expo
conversion) work more accurately around the center-point of the 2164?

The reason I ask is because I'd like to adapt this scheme to work with a
unipolar CV coming from a MCU. I'm also wondering if I can drop VCA3, as
high frequency compensation of non-temperature dependent effects can be
entirely done inside the MCU.

Best,

Rutger
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20260802/856335bc/attachment.htm>