×

GNSS接收机带有滤波功能可变增益放大器的设计

消耗积分:3 | 格式:rar | 大小:598 | 2011-01-04

李静

分享资料个

传统GNSS前端接收机系统中，可变增益放大器（VGA）不具备滤波功能，大多数选用片外滤波，这样系统增益和集成度降低，而系统集成的波器选频性能有限。为此，设计一种具有滤波功能的可变增益放大器，采用0.5μm SiGe HBT工艺，可控增益单元与G m -C滤波单元集成一体，并运用4晶体管回转器结构实现滤波。电路驱动电压为3.3V，电流为11.7mA，线性增益控制范围为-26～62dB，且电压控制范围为0～1.8V，最小增益下输入1dB压缩点为-4dBm。可变增益放大器电路不仅具备大的增益控制范围
Abstract:
 In the traditional GNSS front-end receiver system，the variable gain amplifier（VGA）doesn’t have the filtering function，so the off-chip filter is often used in the system.Mostly the off-chip filtering is used to lower both of the system gain and the integration level，whereas the frequency-selective property of the system integration filter is limited.Thus，we designed a new type of VGA，which carried a filtering function.In this design，the VGA used0.5μm SiGe HBT process technology，the controllable gain unit and the Gm-C filtering unit were integrated，and the filtering function was realized through the application of four transistors Gyrator structure.The circuit’s driving voltage is3.3V，the current is11.7mA，the range of the linear gain control is from-26dB to62dB，and the range of the voltage control is from0V to1.8V.Under the smallest gain，the1dB compression point is-4dBm.The VGA circuit possesses not only a great range of gain control，but also a good filtering performance in IF46MHz，which will increase the integration level of the chip，and reduce the power consumption of the system.
下载并关注上传者 低至0.43元/天 开通VIP 免费下载

声明：本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人，不代表电子发烧友网立场。文章及其配图仅供工程师学习之用，如有内容侵权或者其他违规问题，请联系本站处理。 举报投诉

评论(0)
发评论

下载排行榜

全部0条评论

快来发表一下你的评论吧 !