Study On Key Techniques Of Anti-interference And Multi-mode Navigation Receiver RF IC

With the development of the satellite navigation industry, navigation system provides us diverse and high quality time and location information which including latitude, longitude and altitude. Furthermore, we can obtain map location, direction and velocity information based on that original information which can solve the “when” and “where” problems. Nowadays, there is an emerging trend in multi-mode navigation system including GPS, Beidou, Glonass and Galileo, which not only promote the business of mobile internet, cloud-computing and IOT(internet of things), but also accelerate the progress of the human society.This dissertation mainly focuses on research and design of anti-interference multi-mode navigation receiver and key techniques including receiver architecture, system specification, anti-interference reconfigurable RF front-ends, reconfigurable filters and fast-lock low noise PLLs.Firstly, the architecture of multi-mode navigation receiver is designed based on the requirements of GPS, Beidou, Glonass and Galileo navigation system in this dissertation. Due to the wide range of the navigation satellite frequency, all bands fully compatible receiver is hardly realized. Meanwhile theie is no all bands fully compatible tranceiver RF chip is realized by means of dual channel integration nowadays. Meantime, after considering the low power, reconfigurability and feasibility of the receiver, the system specifications are analyzed and the building blocks link budgets for the proposed multi-mode navigation receivers are synthesized. This is the foundation of the building blocks research and design. Based on 0.13μm RF CMOS process, a full integrated anti-interference GPS, Beidou, Glonass and Galileo navigation transceiver is proposed.Due to the interference of wireless commucation systems espiecially the WIFI and LTE signals, a high gain, high linearity, low noise RF front-end based on anti-interference loop and 25% duty cycle local oscillator passive mixer is design in this dissertation. The front-end achieves 44.98 dB gain and 2.03 dB noise figure at 2.5GHz with 18 dB out-band interference rejection improvement. Additionally, in order to decreasing the non-linear products the front-end adopts passive mixer structure and IIP2 calibration system and successfully achieves +7dBm IIP3 and +72dBm IIP2.To reject the interference and realize the zero/low IF receiver structure, this dissertation gives an active-RC complex band-pass/low-pass filter design which is order reconfigurable, low/band pass switchable and compatible with all navigaition bands. Tested results show that the rejection of the filter is more than 38 dB at twice bandwidth offset which is 16 dB better than similar ones. The image rejection is 35 dB which will improve the performance of the anti-interference.For improving the compatibility of the receivers, a dual-mode auto frequency calibration(AFC) fast locking PLL is designed for the multi-mode receiver through auto logic control. This PLL supports the frequency range from 2.2-5GHz. Tested 3.96 GHz frequency phase noise is-90 dBc/Hz@100 KHz offset and-120 dBc/Hz@1MHz offset. By using the analog mode in lock detection and digital mode in unlock detection, tested AFC time is less than 9 μs and the total PLL lock time is less than 19 μs.Finally key problems and solutions of the top design and layout are analyzed. This dissertation shows the test methods of the channel gain, noise figure and dynamic range and gives the comparison results. Tested results show that this receiver is suitable for multi-mode navigation system and the maximum gain is 105 dB, noise figure is 3.1dB and dynamic range is 85 dB which are met the system requirements.This dissertation is supported by Guangdong Province University-industry Cooperation Project “Research design and industrialization of BD2/GPS terminal equipment key chip”. The research and creative results of this dissertation will be not only suitable for research design and industrialization of satellite navigation equipment, but also suitable for other wireless communication terminal design.