Title :
Reconfigurable low pass filter with Automatic Frequency Tuning for WCDMA and GSM application
Author :
Jiang, Chen ; Xie, Renzhong ; Li, Weinan ; Huang, Yumei ; Hong, Zhiliang
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
Abstract :
A reconfigurable baseband low-pass filter (LPF) with automatic cut-off frequency tuning for WCDMA and GSM application is presented. Cut-off frequencies of 2.1MHz and 200-KHz, and out of band IIP3 at least 20.8dBm and 22.7dBm are achieved under WCDMA and GSM mode respectively. The in band ripple is below 0.5dB in both modes. By utilizing digital frequency tuning technique, a cut-off frequency error of less than 2.5% is obtained. The total tuning time is about 5.5μs. The LPF is fabricated in SMIC 0.13μm CMOS technology with chip area of 0.35mm2, and the current consumptions are 8.3mA and 1.1mA for WCDMA mode and GSM mode respectively under a power supply of 1.5V.
Keywords :
CMOS digital integrated circuits; cellular radio; circuit tuning; code division multiple access; low-pass filters; radiofrequency filters; CMOS technology; GSM application; IIP3; SMIC; WCDMA application; automatic cut-off frequency tuning; current 1.1 mA; current 8.3 mA; cut-off frequency error; frequency 2.1 MHz; frequency 200 kHz; reconfigurable baseband LPF; reconfigurable low pass filter; size 0.13 mum; utilizing digital frequency tuning technique; voltage 1.5 V; Baseband; Chebyshev approximation; GSM; Multiaccess communication; Spread spectrum communication; Tuners;
Conference_Titel :
ASIC (ASICON), 2011 IEEE 9th International Conference on
Conference_Location :
Xiamen
Print_ISBN :
978-1-61284-192-2
Electronic_ISBN :
2162-7541
DOI :
10.1109/ASICON.2011.6157392
