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DAC Speed and Glitches

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This section deals with non-idealities and may be skipped on a first reading.

When a DAC is set to a desired output code, it does not instantaneously jump to the desired output current or potential. It changes to the new output potential (or current) over a finite time (the settling time) and may get there with assorted jumps and signal spikes (glitches) rather than transitioning from old to new output values smoothly and monotonically.

There are several causes for such non-idealities:

a) switch capacitance and inductance

b) asynchronous switching

c) finite amplifer speed

For simplicity assume we're using a straight binary, 8 bit DAC. That way, the number representation corresponds to the figures in Ladder Networks and the numbers are small enough to be convenient (0 to 255).






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