65nm Low Power Digital to Analog Converter for CUWB

This paper presents a high speed, low power and high bandwidth DAC (Digital to Analog Converter) for the cognitive ultra-wide band radio networks. DAC is used to provide the analog voltage converted from the digital input to the CUWB (Cognitive ultra wide band) radio network to reduce the power consumption and noise. The complexity of the hardware is highly reduced. To achieve simpler design the resolution is limited to 4 bits only. The design is realized in standard 65 nm CMOS technology. The design comprises of deglitcher, current switches and current sources. Current switches are the output analog parts of the design. Deglitcher is used to reduce the unwanted glitches introduced in the circuit. Current sources are designed in the binary implementation which reduces the hardware area and complexity. Deglitcher circuit is made from the David - Goliath inverter and a pair of the of source followers to tackle the unwanted noise in the circuit. Current switches are introduced so as to convert the analog voltage according to the input from the deglitcher output. INL and DNL of the circuit is so adjusted with relation of output impedance of the circuit. High Frequency of around 12.5 GHz and power dissipation of as low as 21 mW is achieved.