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Design of an ultra-low-power current steering DAC in a modern SOI technology

: Venkatesha, Shishira Subbarao
: Lienig, Jens; Koh, Jeongwook

Volltext urn:nbn:de:0011-n-5810804 (2.9 MByte PDF)
MD5 Fingerprint: 07f288586abbec462cf7057733860e90
Erstellt am: 11.3.2020

Dresden, 2020, XI, 66 S.
Dresden, TU, Master Thesis, 2020
Sächsische Aufbaubank - Förderbank SAB
100317397; USeP
Universelle Sensor-Plattform
Master Thesis, Elektronische Publikation
Fraunhofer IIS, Institutsteil Entwurfsautomatisierung (EAS) ()

Despite the tremendous advancement in innovations on digitising and processing signals over the last century, real world signals are inevitably analog in nature. A digital-to-analog converter (DAC) serves in translating these digitised signals into different analog quantities like voltage, current or charges. We mainly focus on a Nyquist-rate current-steering digital-to-analog converter (CS-DAC) with resolution scalability from 8 to 12 bit, based upon the required output current for the application. The proposed CS-DAC has a conversion rate of 10 Mega Samples per second (MSps) and adopts a segmented architecture for 8 bit to 12 bit resolution, where optimization is made for achieving a good performance with an area restriction. Especially, a new mode selection decoder is proposed and implemented for the resolution scalability of CS-DAC to 12 bit, 10 bit and 8 bit. The CS-DAC is implemented in a 22 nm Fully Depleted Silicon on Insulator (FDSOI) process and only 0.8 V digital transistors were used for the design. For a typical case of 8 bit resolution, the simulated integral non-linearity (INL) is within 0.05 LSB and the simulated differential non-linearity (DNL) lies between -0.06 and 0.01 LSB providing 7.9 bit accuracy. The10 MSps conversion rate has been obtained by transistor level designed binary-to-thermometer decoder and synchronisation circuit. A spurious-free dynamic range (SFDR) of 57 dB has been obtained for an input signal frequency in the interval from direct current (DC) to Nyquist-rate. The scalable CS-DAC is designed for ultra-low-power application. It has a total DC power consumption of 0.21 mW at 8 bit operation, 0.51 mW at 10 bit operation and 2.4 mW at 12 bit operation. To the best of our knowledge, this is the first demonstration of a DAC capable of scaling its resolution.