Title :
A CMOS direct-conversion I/Q up-mixer block for ultra-wideband system
Author :
Kim, Chang-Wan ; Lee, Seung-Sik ; Park, Bong-Hyuk ; Shim, Yun-A ; Lee, Sang-Gug
Author_Institution :
Electron. & Telecommun. Res. Inst., Daejeon
Abstract :
This paper presents a direct-conversion I/Q up-mixer block, which is implemented in 0.18 mum CMOS technology, for the ultra-wideband (UWB) system. To achieve wideband characteristics, a shunt-peaking load is used in the up-mixer. A new wideband amplifier is also proposed, which can suppress unwanted common-mode signals with high linearity. The simulation results show gain flatness of less than 0.5 dB for three channels, a maximum output power level of -4.3 dBm, and a sideband rejection ratio of more than 60 dBc. The current consumption of this design is 27 mA from a 1.8 V power supply
Keywords :
CMOS integrated circuits; interference suppression; mixers (circuits); modulators; radio transmitters; radiofrequency amplifiers; telecommunication channels; ultra wideband communication; wideband amplifiers; 0.18 mum; 1.8 V; 27 mA; CMOS direct-conversion I-Q up-mixer block; modulator; shunt-peaking load; sideband rejection; transmitter; ultrawideband system; wideband amplifier; wideband characteristics; Bandwidth; CMOS technology; FCC; Multiaccess communication; Power generation; RF signals; Radiofrequency amplifiers; Transmitters; Ultra wideband technology; Voltage;
Conference_Titel :
Advanced Communication Technology, 2005, ICACT 2005. The 7th International Conference on
Conference_Location :
Phoenix Park
DOI :
10.1109/ICACT.2005.245832
