This schematic and Gerber files of PCB that is used for GPS tracking device with GSM link. Scheme has many valuable schematic features, like protected digital and analog I/Os, power part adapted for car power supply, etc. Can be used as a refere

上传资料是GSM手机功率放大器的规格书和原理图-Upload data is GSM mobile phone power amplifier specifications and schematic

GPS模块的原理图，其中包括GPS射频拓扑设计，GPS基带部分设计和GPS电源供给设计-Schematic of the GPS module, including the GPS RF topology design the GPS baseband part of the design and the GPS power supply design