An Auto-calibrating I/Q Mismatch Scheme for High Image Rejection GPS RF Receiver
An auto-calibrating I/Q mismatch scheme for high image rejection Multi-mode Global Navigation Satellite Systems RF receiver is proposed in this paper. Due to gain and phase errors between I and Q paths, image rejection will be restricted at poor level from the mismatch instead of components themselves in the system. The proposed calibrating scheme included an analog image rejecter and a digital error detector corrects the mismatch to optimize the image rejection performance using bisection adaptive feedback concept. Within 0.5dB gain error and 3 degree phase error, the proposed auto-calibrating scheme followed by a 5th complex filter can achieve 53.5dB image rejection, compared with 28dB without the scheme. The whole circuit consumes 1.1 mA at 1.8V.
Lijiong Wang Tingting Mo Dongpo Chen
Center for Analog/RF Integrated Circuits(CARFIC), School of Microelectronics Shanghai Jiao Tong University, Shanghai 200240, China
国际会议
2011 IEEE 9th International Conference on ASIC(2011年第九届IEEE国际专用集成电路大会)
厦门
英文
1131-1134
2011-10-25（万方平台首次上网日期，不代表论文的发表时间）