This paper presents a new 12-bit digital to analog converter (DAC) circuit based on a low-offset bandgap reference (BGR) circuit\nwith two cascade transistor structure and two self-contained feedback low-offset operational amplifiers to reduce the effects of\noffset operational amplifier voltage effect on the reference voltage, PMOS current-mirror mismatch, and its channel modulation. A\nStart-Up circuit with self-bias current architecture andmultipoint voltagemonitoring is employed to keep the BGR circuit working\nproperly. Finally, a dual-resistor ladderDAC-Core circuit is used to generate an accuracyDACoutput signal to the buffer operational\namplifier.The proposed circuit was fabricated in CSMC 0.5
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