Design of CMOS quadrature modulator for WLAN 802.11a application

Author

Li, Zhiqun ; Su, Junjie ; Wang, Zhigong

Author_Institution

Inst. of RF & OE-IC, Southeast Univ., Nanjing, China

fYear

2005

fDate

30 Nov.-2 Dec. 2005

Firstpage

176

Lastpage

178

Abstract

This paper describes the design of a 1-GHz quadrature modulator for 802.11a WLAN systems with TSMC 0.18-μm CMOS technology. By using an improved double-balanced mixer combined with a double-balanced mixer, a common-mode feedback circuit and an improved transconductance amplifier, the linearity of the modulator is improved. The experimental results show the modulator achieves -5 dBm for P_{1 dB}, -42 dB for LO-IF isolation, and a gain of 1.2 dB. The power consumption is 49 mW with a 1.8-V power supply.

Keywords

CMOS integrated circuits; circuit feedback; mixers (circuits); modulators; wireless LAN; 1 GHz; 1.8 V; 49 mW; CMOS quadrature modulator; TSMC; WLAN 802.11a application; common-mode feedback circuit; double-balanced mixer; power consumption; transconductance amplifier; Bandwidth; CMOS technology; Feedback circuits; Isolation technology; Linearity; OFDM modulation; Transconductance; Transmitters; Voltage; Wireless LAN; 802.11a WLAN; Quadrature modulator; common-mode feedback; double-balanced mixer; transconductance amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio-Frequency Integration Technology: Integrated Circuits for Wideband Communication and Wireless Sensor Networks, 2005. Proceedings. 2005 IEEE International Workshop on

Print_ISBN

0-7803-9372-4

Type

conf

DOI

10.1109/RFIT.2005.1598904

Filename

1598904