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Application of Intersil digitally controlled potentiometers (XDCP) as hybrid analogue/digital feedback system control elements

Posted: 23 Sep 2009     Print Version  Bookmark and Share

Keywords:potentiometers  analogue digital feedback  design paradigm feedback 

For the most part, the universe of feedback system design separates neatly into two fundamental design paradigms: analogue-based designs and digital-based designs. Both design strategies are characterised by advantages and liabilities that generally make one or the other a clearly superior choice for any given application. Pure analogue designs, for example, tend to display design simplicity and low development costs that play well in the context of smaller system applications. Digital-based designs, by contrast, have essentially unlimited flexibility in computation of the feedback function and therefore dominate in more complex feedback applications in which higher development costs (generally including software implementation) can be justified. Sometimes, a feature of particular utility in digital designs is the availability of digital memory with its ability to store feedback parameters for arbitrary lengths of time without drift. This makes possible a variety of system solutions including multiple system operating modes in which feedback values can be acquired in some modes and then applied in others.

But what about feedback systems that lie in between these clear opposites? What about relatively simple cost-sensitive applications that would benefit from functions that are difficult to implement in analogue circuits and would therefore require digital techniques?

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