A reconfigurable analog baseband circuit for WLAN,WCDMA,and Bluetooth

• Published in: Journal of semiconductors Vol. 31; no. 5; pp. 121 - 125
• Main Author: 童瑶 池保勇 王自强 张莹 姜汉钧 王志华
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.05.2010
• Subjects: WCDMA; 可变增益放大器; 可重构; 基带电路; 无线局域网; 椭圆低通滤波器; 电模拟; 蓝牙基带
• ISSN: 1674-4926
• DOI: 10.1088/1674-4926/31/5/055010

A reconfigurable analog baseband circuit for WLAN,WCDMA,and Bluetooth in 0.35μm CMOS is presented. The circuit consists of two variable gain amplifiers（VGA） in cascade and a Gm-C elliptic low-pass filter（LPF）. The filter-order and the cut-off frequency of the LPF can be reconfigured to satisfy the requirements of various applications. In order to achieve the optimum power consumption,the bandwidth of the VGAs can also be dynamically reconfigured and some Gm cells can be cut off in the given application.Simulation results show that the analog baseband circuit consumes 16.8 mW for WLAN,8.9 mW for WCDMA and only 6.5 mW for Bluetooth,all with a 3 V power supply.The analog baseband circuit could provide -10 to ＋40 dB variable gain,third-order low pass filtering with 1 MHz cut-off frequency for Bluetooth,fourth-order low pass filtering with 2.2 MHz cut-off frequency for WCDMA, and fifth-order low pass filtering with 11 MHz cut-off frequency for WLAN,respectively.