Title :
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
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;
Conference_Titel :
Microelectronics, 2003. ICM 2003. Proceedings of the 15th International Conference on
Print_ISBN :
977-05-2010-1
DOI :
10.1109/ICM.2003.1287734
