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Digital Waveform Generation by Pete Symons

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9 Digital to analogue conversion

In this chapter we discuss conversion of discrete-time digital signals to the continuous-time or analogue domain. So far we have only investigated generation of digitally represented signals that are sampled in time and quantised in amplitude to a specific number of bits b. Accordingly, in an ideal convertor there are 2b equally spaced quantisation levels that follow an exact linear relationship with the input code. We call this process digital to analogue conversion, and it comprises several distinct sequentially connected processing functions that we consider in this chapter:

  • the digital to analogue convertor (DAC);
  • a glitch reduction stage, or ‘deglitcher’ (if required);
  • a typically low-pass reconstruction filter; ...

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