Title :
A low-distortion 1.2 V DAC+filter for transmitters in wireless applications
Author :
Ghittori, Nicola ; Vigna, Andrea ; Malcovati, Piero ; Baschirotto, Andrea ; Amico, Stefano D.
Author_Institution :
Dept. of Electron., Univ. of Pavia, Italy
Abstract :
The design in a standard 0.13 μm CMOS technology of a 1.2 V baseband block (DAC+filter), intended for wireless applications (UMTS, WLANs), is presented. A transimpedance stage is placed between the two functional blocks to improve the static and dynamic linearity performance of the current steering DAC with respect to a solution in which the DAC outputs are directly connected to the following reconstruction filter. Transistor level simulations have been used to evaluate the DAC DNL-INL and the dynamic linearity performance (OIP3) at the filter output. A comparison with the simulated performance of an implemented block which does not use the DAC output transimpedance stage confirms the effectiveness of the proposed solution.
Keywords :
3G mobile communication; CMOS integrated circuits; broadband networks; circuit simulation; code division multiple access; digital-analogue conversion; integrated circuit design; integrated circuit modelling; radiofrequency filters; wireless LAN; 0.13 micron; 1.2 V; 3G systems; CMOS technology; DAC DNL-INL; DAC outputs; OIP3; UMTS; WCDMA; WLAN; baseband block design; current steering DAC; dynamic linearity performance; filter output; functional blocks; low-distortion DAC+filter; reconstruction filter; simulated performance; static linearity performance; transimpedance stage; transistor level simulations; transmitters; wireless applications; wireless communications systems; 3G mobile communication; Baseband; CMOS technology; Digital filters; Digital-analog conversion; Linearity; Low voltage; Technological innovation; Transmitters; Wireless LAN;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464703
