Title :
A CMOS transmitter front-end with digital power control for WiMAX 802.16e applications
Author :
Liu, Yu-Hsuan ; Chen, Hsiao-Chin ; Wang, Tao ; Lu, Shey-Shi
Author_Institution :
Graduate Inst. of Electron. Eng., Nat. Taiwan Univ., Taiwan
Abstract :
A 5.8 GHz transmitter front-end comprising a quadrature modulator, a variable gain amplifier and an on-chip output balun in CMOS 0.18-μm technology is presented. The quadrature modulator adopts cross-coupled type micro-mixer, and the measured 3rd-order rejection is 32 dB under input voltage swing of 250 mVpp. With four-bit control words, a 16-step linear-in-dB output power is realized to achieve a dynamic range of 27 dB. A single-ended type output is accomplished by an on-chip 3:1 transformer and the output matching network is therefore simplified.
Keywords :
CMOS integrated circuits; MMIC; WiMax; baluns; microwave amplifiers; microwave mixers; modulators; power control; radio transmitters; 0.18 micron; 250 mV; 5.8 GHz; CMOS technology; CMOS transmitter; WiMAX 802.16e; cross-coupled micromixer; digital power control; input voltage swing; on-chip output balun; on-chip transformer; output matching network; quadrature modulator; single-ended output; third-order rejection; variable gain amplifier; CMOS technology; Dynamic range; Gain; Impedance matching; Network-on-a-chip; Power amplifiers; Power control; Power generation; Transmitters; WiMAX; RF; VGA; digital control; linear-in-dB; transmitter;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1606599
