Temperature Compensation of Analog Exponential Converters

Say WHAT??!!? Everyone loves analog, right? Too bad analog oscillators tend to drift with temperature. But exactly how much, and why, and what can be done about it? We recently finished an in-depth analysis of the main culprit in these circuits: the exponential converter. This is the part that converts the input voltage to octaves at the output. If you’re interested in finding out more about these circuits, and how to keep them stable, the following paper could be for you!

Thermal Compensation of Analog Exponential Converters (PDF)

It has a bit of math in it, but it’s written to be accessable as possible. It’s also not completely finished, but what project ever is? Knowledge just keeps expanding, leaving the world feeling smaller and smaller each day.

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One Comment

  1. Rick Jelliffe
    Posted April 13, 2015 at 12:12 pm | Permalink

    Wow, that is a great collection. Really useful and informative. Well done!
    As well as the various methods of temp compensation you give one method of temp control: the heater. What do you think about other forms of temp control: gluing everything onto big heat sinks, or adding a thermostat and peltier device ($11)?
    (Early ARP expo converters had some simple copper heat bands to sink heat from the expo pair, but i expect they amplify the effects of drafts, rather than stabilize.)
    If common cheap methods of expo control dont work well at extreme temperature, couldn’t they still be combined with rough temperature control to keep the hardware cto within its sweet range?

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