A Frequency Auto-Tuning Complex Filter with 48dB Gain Tuning and 65dB DC-Offset Rejection

摘要：

A 4th order Chebyshev complex filter with stop band zeros at the DC point for low-IF receivers applications using 0.18μm CMOS technology is proposed in this paper. Based on capacitor-OTA integrators, the designed ladder filter uses resistors instead of capacitors to realize the transmission zeros. The complex filter has a 0 to 48dB tunable gain (6dB per step) and over 65dB DC-offset rejection. A simple and fast frequency auto-tuning scheme with delay lock loop and binary search algorithm is utilized to auto-calibrate the pass-band bandwidth (4MHz) and center frequency (4MHz). The whole complex filter consumes 2.5mA from a 1.8V supply.

作者: Junzhang Tan Lijiong Wang Dongpo Chen Jianjun Zhou

作者单位: Center for Analog/RF Integrated Circuits (CARFIC), School of Microelectronics Shanghai Jiao Tong University, Shanghai 200240, China

会议类型: 国际会议

会议名称: 2010 10th IEEE International Conference on Solid-State and Integrated Circuit Technology(第十届固态和集成电路技术国际会议 ICSICT-2010)

会议地点: 上海

会议语种:英文

页码: 451-453

在线出版日期: 2010-11-01（万方平台首次上网日期，不代表论文的发表时间）