R-2R Circuit as Digital to Analog Converter

BACKGROUND

I prepared this for my Introduction to Microelectronic Circuits class at Olin.  It was one of the first post-lab exercises we were challenged with.

SUMMARY

Using basic electronics laws (e.g. Ohm's, Kirchoff's), I show how an R-2R ladder network of resistors (shown below) can function as a digital to analog converter.  The values of the various digital input switches (labeled as b0 ... bN-1) determine the analog value of the output current, Iout.



FULL TEXT

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Mike Hughes,
Jan 15, 2009, 12:30 PM