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max value<br />

bus<br />

voltage follower<br />

strictly monotonic<br />

3-Bit Resistor String Converter<br />

Stephan Henzler Mixed-Signal-Electronics 2012/13<br />

Generate all possible voltages with<br />

resistive voltage divider<br />

Switches = NMOS transistors<br />

Transmission gates enable<br />

– higher voltage range<br />

– but higher parasitic cap, area<br />

(layout more complicated)<br />

Buffer experiences high input<br />

voltage variation<br />

Slow due to buffer and analog mux<br />

How fast does the DAC settle<br />

139

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