CMOS RF circuits for 5-GHz BWA

CMOS RF circuits suitable for broadband wireless access (BWA) applications including IEEE 802.11a and IEEE 802.16e are introduced. The critical requirements of receivers, transmitters and frequency synthesizers are discussed. The performances of several implemented 5-GHz CMOS RF building blocks are reported. The receiver front-end exhibits 7.2-dB noise figures, -21.2-dBm P1B and 25.2-dB gain. From 4.9 to 5.9 GHz, the S11 is below -10 dB. The transmitter front-end can provide digital power control with dynamic range more than 30 dB and the measured output return loss is below -10 dB from 4.9 to 5.1 GHz. The frequency synthesizer can achieve a resolution less than 1 Hz and settling time shorter than 10 mus. The synthesized carrier signal exhibits an integrated phase noise of only 0.44 degree rms. These results show that the presented RF circuits are very promising in the realization of transceivers for modern wireless broadband access standards