Gm-C complex transitional filter for low-IF wireless LAN application

Author

Teo, T. Hui ; Khoo, Ee-Sze ; Uday, Dasgupta

Author_Institution

Integrated Circuits & Syst. Lab., Inst. of Microelectron., Singapore, Singapore

fYear

2003

fDate

9-11 Dec. 2003

Firstpage

110

Lastpage

113

Abstract

The design and implementation of a gm-C complex filter for low-IF WLAN is described. Fifth-order transitional complex Bessel-Chebyshev filter is implemented to compromise between high attenuation and low group-delay variation. The circuit is fabricated using 0.18 μm CMOS process. Measured results show that the filter provides 30 dB to 40 dB image rejection and 18 dB adjacent channel rejection, while keeping a low group-delay variation of below 6.0ns within the pass-band. High frequency and wide bandwidth filter also requires stringent design specification of the circuitries. Differential inverter transconductor is optimized for this gm-C continuous-time filter design. The complete filter including on-chip tuning circuit and bandgap consumes only 7.5 mA with 1.8 V single supply voltage.

Keywords

CMOS integrated circuits; continuous time filters; integrated circuit design; system-on-chip; wireless LAN; CMOS process; adjacent channel rejection; differential inverter transconductor; gm-C complex transitional filter design; gm-C continuous-time filter design; image rejection; low-IF wireless LAN application; on-chip tuning circuit; transitional complex Bessel-Chebyshev filter; wide bandwidth filter; Attenuation; Band pass filters; Bandwidth; CMOS process; Circuits; Design optimization; Frequency; Inverters; Transconductors; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics, 2003. ICM 2003. Proceedings of the 15th International Conference on

Print_ISBN

977-05-2010-1

Type

conf

DOI

10.1109/ICM.2003.1287734

Filename

1287734