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Efficient two-stage digital-to-analog converter using sample-and-hold circuits

Image Number 3 for United States Patent #6191720.

The present invention is a method and apparatus for converting a digital word into an analog quantity. A first plurality of signals is generated from a resistor network. A first signal is selected from the first plurality of signals based on a first half of the digital word. A second plurality of signals is generated from the resistor network using the selected first signal. A second signal is selected from the second plurality of signals based on a second half of the digital word. The second signal corresponds to the analog quantity.

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