Title :
An integrated CDMA intermediate-frequency transceiver for wireless local loop
Author :
Lee, Jae-Heon ; Seo, Hye-Ju ; Song, Ho-Jun
Author_Institution :
Dept. of Electron. Eng., Chung Nam Nat. Univ., Taejon, South Korea
fDate :
5/1/1999 12:00:00 AM
Abstract :
This paper describes the design and implementation of a 10-MHz bandwidth WLL (wireless local loop) intermediate-frequency (IF) transceiver integrated circuit. The chip interfaces between the RF (radio frequency) and the digital modem sections, which performs the IF-to-baseband (Rx) and baseband-to-IF (Tx) frequency conversions. It incorporates two fixed frequency PLLs, low pass filters, A/D and D/A converters. It is implemented in a 0.6-μm silicon CMOS process. The PLLs include the VCOs, dividers, phase detectors, charge pump circuits on chip. The only external components are the loop filter and the varactor-tuned tank circuit. Total supply currents are 40 mA and 50 mA for the Rx and Tx modes, respectively, at 3.3 V
Keywords :
CMOS integrated circuits; analogue-digital conversion; code division multiple access; digital-analogue conversion; low-pass filters; phase locked loops; radio access networks; transceivers; 0.6 micron; 10 MHz; 3.3 V; 40 mA; 50 mA; A/D converter; ADC; CMOS process; D/A converter; DAC; IF transceiver IC; IF-to-baseband frequency conversion; RF section; Si; VCO; baseband-to-IF frequency conversion; charge pump circuits; digital modem; dividers; fixed frequency PLL; integrated CDMA intermediate-frequency transceiver; integrated circuit; loop filter; low pass filters; phase detectors; radio frequency section; supply current; varactor-tuned tank circuit; wireless local loop; Bandwidth; CMOS process; Circuits; Frequency conversion; Low pass filters; Modems; Multiaccess communication; Radio frequency; Silicon; Transceivers;
Journal_Title :
Consumer Electronics, IEEE Transactions on
