A novel analog/digital reconfigurable automatic gain control with a novel DC offset cancellation circuit |
| |
Authors: | He Xiaofeng Mo Taishan Ma Chengyan Ye Tianchun |
| |
Affiliation: | 1. Institute of Microelectronics, Chinese Academy of Science, Beijing 100029, China 2. Hangzhou Zhongke Microelectronics Co, Ltd, Hangzhou 310053, China |
| |
Abstract: | An analog/digital reconfigurable automatic gain control (AGC) circuit with a novel DC offset cancel- lation circuit for a direct-conversion receiver is presented. The AGC is analog/digital reconfigurable in order to be compatible with different baseband chips. What's more, a novel DC offset cancellation (DCOC) circuit with an HPCF (high pass cutoff frequency) less than 10 kHz is proposed. The AGC is fabricated by a 0.18μm CMOS process. Under analog control mode, the AGC achieves a 70 dB dynamic range with a 3 dB-bandwidth larger than 60 MHz. Under digital control mode, through a 5-bit digital control word, the AGC shows a 64 dB gain control range by 2 dB each step with a gain error of less than 0.3 dB. The DC offset cancellation circuits can suppress the output DC offset voltage to be less than 1.5 mV, while the offset voltage of 40 mV is introduced into the input. The overall power consumption is less than 3.5 mA, and the die area is 800×300μm2. |
| |
Keywords: | automatic gain control analog/digital reconfigurable DC offset cancellation |
本文献已被 CNKI 万方数据 等数据库收录! |
|