A 12-bit low-power successive approximation analog-to-digital converter with a typical sampling speed of 1 MSPs is designed to work under a single power supply voltage of 5 V. The D/A converter in the design adopts a charge distributed structure with a capacitor voltage divider, which greatly saves the chip area while expanding the resolution of the parallel D/A converter. The built-in 3.3 V reference voltage source adopts a self-biased power supply mode, which improves the accuracy of the reference voltage and reduces power consumption. The cadence spectre tool is used for simulation, and the post-simulation results show that the designed D/A converter and the 3.3 V reference source meet the requirements of 12-bit A/D conversion, and the successive approximation A/D converter can work normally.
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