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Hybrid SAR Converters<br />

Search can be done with different<br />

references<br />

Same idea as for DACs<br />

– monotonous resistor string for MSBs<br />

– binary weighted cap array for LSBs<br />

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

1. Charge caps to -vin<br />

2. Binary search in resistive<br />

network: vx = -vin + vres<br />

3. Interpolate in between two<br />

subsequent taps of resistor<br />

string by charge redistribution<br />

187

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