A Design Of 10-bit 200MHz Current-steering DAC

This thesis presents an investigation of the design, analysis, and implementation of 10-bit dual-mode current-steering DAC. The DAC is divided into a digital part and an analog part. In the digital part, the 6-bit MSB is converted into thermometer code and the binary weighted 4-bit LSB is used to get a better DNL error and guarantee monotonicity. In the analog part, the current cell that can provide of different currents is proposed. Thus, the current need to perform the voltage-mode or current-mode operation can be obtained.Besides, the area of current source is properly chosen to overcome mismatch error due to the process variation. A transimpedance amplifier is designed to convert current into voltage through resistor in voltage mode. The current mode DAC directly drives an external resistor. In addition, a high speed and low crossing point switch driver is designed to minimize glitch error during dynamic switching transition. This DAC is fabricated with 0.25 μ m single-poly, five-metal process. The active area is 0.15 mm2 which is smaller compared until those published up to now.