Title :
WCDMA/GSM dual mode signal generation for direct conversion receiver
Author :
Park, Y. ; Chakraborty, Shiladri ; Yoon, S.-W. ; Laskar, J.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Tech. Res. Inst., Atlanta, GA, USA
Abstract :
In this paper, we discuss the design of a VCO and the frequency divider for a dual mode direct conversion receiver (WCDMA/GSM), emphasizing the topology which enables a wide tuning range while achieving low phase noise, and accurate quadrature signal generation in a standard digital 0.25μm CMOS process. The designed VCO has a 1.06 GHz tuning range with a 4 GHz of center frequency consuming 16.8 mW from 2.25 V of the power supply. The frequency divider consumes 1 mA. Pros and cons of VCO topology are discussed, and the design of the frequency divider on the phase noise of a signal source is investigated.
Keywords :
CMOS integrated circuits; broadband networks; cellular radio; code division multiple access; frequency dividers; phase noise; radio receivers; signal generators; voltage-controlled oscillators; 0.25 micron; 1 mA; 1.06 GHz; 16.8 mW; 2.25 V; 4 GHz; GSM dual mode signal generation; WCDMA; dual mode direct conversion receiver; frequency divider; low phase noise; signal source; standard digital CMOS process; wide tuning range; wideband code division multiple access; Frequency conversion; GSM; Multiaccess communication; Phase noise; Signal design; Signal generators; Signal processing; Topology; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Radio and Wireless Conference, 2003. RAWCON '03. Proceedings
Print_ISBN :
0-7803-7829-6
DOI :
10.1109/RAWCON.2003.1227926
