Design Of Digital To Analog Converter (DAC) For Integrated Bluetooth Applications Using 0.18μm CMOS Technology

• Main Author: Low, Pit Xing
• Format: Monograph
• Language: English
• Published: Universiti Sains Malaysia 2005
• Subjects: T Technology; TK Electrical Engineering. Electronics. Nuclear Engineering
• Online Access: http://eprints.usm.my/57621/1/Design%20Of%20Digital%20To%20Analog%20Converter%20%28DAC%29%20For%20Integrated%20Bluetooth%20Applications%20Using%200.18%CE%BCm%20Cmos%20Technology_Low%20Pit%20Xing.pdf; http://eprints.usm.my/57621/

Digital to analog converter (DAC) is one of the important elements in the communication circuits. In this project, a digital to analog converter which operates with 1.8V voltage supply is implemented based on 0.18μm Silterra CMOS process technology. The implemented digital to analog converter is an 8-bit parallel inputs R-2R architecture converter. The digital to analog converter operates with a reference voltage and provides a current output. An operational amplifier is connected at the output end of the R-2R network to convert the output current to suitable output voltage. This operational amplifier is a current mirror op-amp with open loop dc voltage gain of 24.64dB. Besides, this op-amp achieves bandwidth of 21.5MHz, with the power consumption of 0.85mW. The mentioned reference voltage is established by another circuit block which known as bandgap reference voltage circuit. This bandgap reference voltage circuit is simply composed of CMOS transistors, op-amp, resistors and diodes. The overall D/A converter circuit has the settling time 8ns, which means the data sampling rate of 125MHz, with power consumption of 31.356mW. The schematic entry and simulation of the whole DAC circuits is done using the software Cadence, Virtuoso and Spectre.