Title :
A Gm-C baseband filter with automatic frequency tuning for a direct conversion IEEE802.11a wireless LAN receiver
Author :
Shi, Bo ; Shan, Weiyun
Author_Institution :
Inst. for Infocomm Res., Singapore, Singapore
Abstract :
A 5th order GM-C baseband filter, with on-chip automatic frequency tuning, implemented in a 0.25 μm BiCMOS process, is presented. Targeted for the channel selecting section of a direct-conversion IEEE 802.11a wireless LAN (WLAN) receiver, this filter has a 9.2 MHz passband with less than 0.3 dB passband ripple. The stop band attenuation is some 40 dB and 70 dB at 20 MHz and 40 MHz, respectively. By using highly linear low noise Gm-C integrators, the filter achieves 79 μVrms total passband noise, 5.6 dBV passband input IP3, and 73 dB dynamic range for 1% THD with a 1 MHz input signal, while consuming less than 15 mW DC power from a 3 V supply.
Keywords :
BiCMOS analogue integrated circuits; Chebyshev filters; automatic frequency control; circuit tuning; integrating circuits; low-pass filters; radio receivers; radiofrequency filters; wireless LAN; 0.25 micron; 1 MHz; 15 mW; 20 MHz; 3 V; 40 MHz; 9.2 MHz; BiCMOS process; Chebyshev low pass filter; Gm-C baseband filter; IEEE802.11a; WLAN; direct conversion receiver; filter passband; low noise integrators; on-chip automatic frequency tuning; passband ripple; receiver channel selection section; stop band attenuation; wireless LAN receiver; Attenuation; Automatic frequency control; Band pass filters; Baseband; BiCMOS integrated circuits; Dynamic range; Nonlinear filters; Passband; Tuning; Wireless LAN;
Conference_Titel :
Solid-State Circuits Conference, 2004. ESSCIRC 2004. Proceeding of the 30th European
Print_ISBN :
0-7803-8480-6
DOI :
10.1109/ESSCIR.2004.1356628
