A fully integrated video digital-to-analog converter with minimized gain error

We propose a 1.5V 10-bit 400MHz fully integrated digital-to-analog converter (DAC). The proposed DAC uses a current-steering architecture with Red/Green/Blue channels to support video display. To improve the integration density, we use an on-die current and voltage reference circuit to replace the off-chip resistor in traditional reference generation approaches. Our reference circuit is temperature insensitive because of using the temperature coefficient of poly resistors. To compensate the gain error mainly caused by process variation in current reference, we further propose an auto-calibration scheme to detect and calibrate the DAC gain error. Simulation results show that the gain error in our fully integrated DAC is minimized to 2.8% through different Process-Temperature (PT) variation conditions.