Title :
A dual-mode low-pass filter for 802.11b/Bluetooth receiver
Author :
Mohieldin, Ahmed Nader ; Sánchez-Sinencio, Edgar
Author_Institution :
Texas Instrum. Inc., Dallas, TX, USA
Abstract :
The design of a dual-mode low-pass channel selection filter for a dual-standard 802.11b/Bluetooth direct conversion receiver is presented. The filter is an OTA-C, 5th order, Butterworth low pass structure. The OTA is implemented as a source-degenerated bipolar differential pair. Dual-mode operation, 600 kHz cut-off frequency for Bluetooth mode and 6 MHz for Wi-Fi mode, is achieved by switching the source-degeneration resistors and the capacitors. The filter operates from a single 2.5 V supply while consuming 2.7 mA and 0.9 mA for 802.11b and Bluetooth, respectively. It achieves 10 dBm in-band IIP3, 40 dBm out-of-band IIIP3 for both modes. The measured input referred noise density is -148.92 dBV/Hz and -140.48 dBV/Hz for 802.11b and Bluetooth, respectively.
Keywords :
BiCMOS integrated circuits; Bluetooth; Butterworth filters; integrated circuit design; integrated circuit measurement; low-pass filters; operational amplifiers; radio receivers; wireless LAN; 0.9 mA; 2.5 V; 2.7 mA; 6 MHz; 600 kHz; BiCMOS process; Bluetooth receiver; IEEE 802.11b receiver; OTA-C Butterworth low pass structure filter; Wi-Fi mode; cut-off frequency; dual-mode low-pass channel selection filter design; dual-mode low-pass filter; dual-mode operation; dual-standard direct conversion receiver; filter supply; in-band IIP3; input referred noise density; out-of-band IIIP3; source-degenerated bipolar differential pair; source-degeneration capacitor switching; source-degeneration resistor switching; Bluetooth; Cellular phones; Consumer electronics; Cutoff frequency; Low pass filters; Personal digital assistants; Printers; Very large scale integration; Wireless LAN; Wireless communication;
Conference_Titel :
Solid-State Circuits Conference, 2004. ESSCIRC 2004. Proceeding of the 30th European
Print_ISBN :
0-7803-8480-6
DOI :
10.1109/ESSCIR.2004.1356708
