半导体学报2009，Vol.30Issue(10)：76-80,5.DOI:10.1088/1674-4926/30/10/105004
A dual-mode complex filter for GNSS receivers with frequency tuning
A dual-mode complex filter for GNSS receivers with frequency tuning
摘要
Abstract
A fifth/seventh order dual-mode OTA-C complex filter for global navigation satellite system receivers is implemented in a 0.18 fxm CMOS process. This filter can be configured as the narrow mode of a 4.4 MHz bandwidth center at 4.1 MHz or the wide mode of a 22 MHz bandwidth center at 15.42 MHz. A fully differential OTA with source degeneration is used to provide sufficient linearity. Furthermore, a ring CCO based frequency tuning scheme is proposed to reduce frequency variation. The measured results show that in narrow-band mode the image rejection ratio (IMRR) is 35 dB, the filter dissipates 0.8 mA from the 1.8 V power supply, and the out-of-band rejection is 50 dB at 6 MHz offset. In wide-band mode, IMRR is 28 dB and the filter dissipates 3.2 mA. The frequency tuning error is less than ±2%.关键词
complex filter/ OTA/ dual-mode/ frequency tuning/ CCO/ GNSSKey words
complex filter/ OTA/ dual-mode/ frequency tuning/ CCO/ GNSS分类
信息技术与安全科学引用本文复制引用
Gan Yebing,Ma Chengyan,Yuan Guoshun..A dual-mode complex filter for GNSS receivers with frequency tuning[J].半导体学报,2009,30(10):76-80,5.基金项目
Project supported by the National High-Tech Research and Development Program of China (No. 2007AA12Z344). （No. 2007AA12Z344）
