A current source is used to pre-charge a capacitor to a known value. The capacitor can then be connected to a unity gain buffer to provide a low cost DAC. The DAC can include a self-calibration stage to improve accuracy. The DAC can include two or more circuit branches, each including a current source and a capacitor, where each branch can be calibrated and operated separately to reduce mismatch and to provide a continuous analog voltage output.
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