Key Technologies Research On Integrated Multi-band Compatible Front-end Of Satellite Navigation Receiver

The Global Navigation Satellite Systems (GNSS), which are widely appliedin aviation, aerospace, navigation, military and consumer electronics etc., have re-cently seen signi?cant development worldwide. Due to the constantly increasing anddiversifying user demands, the single function GPS receiver can no longer satisfyusers'multiple purposes. Multi-mode compatible GNSS receiver realized by inte-grated circuit, which has been a popular research topic in recent years, can breakthe monopoly of GPS, improve positioning accuracy and be used in a global scopewithout blind spots. The dissertation presents the discussion on design methods oflow noise ampli?cation, quadrature downconversion and fully integrated multi-bandRF receiver frontend. A new structure of frontend is given. The core technologiesof GNSS receiver frontend are presented.In the dissertation, the method of single-band low noise ampli?er design underpower constrain is discussed. The noise ?gure and power consumption are discussed.On this basis, a method of dual-band low noise ampli?er optimization is presented.The complete design process is discussed. A dual-band LNA and a tri-band LNAare fabricated in RF CMOS process. The measurement results show consistencewith the design. The design method makes good technical reserves for the GNSSreceiver integration.The mixer proposed in the dissertation is an improved structure based on thetraditional double balance Gilbert cell. A RC networks is implemented as mixer'sload to improve low-pass character. The current bypass paths are added to im-prove the noise ?gure, convert gain and linearity. The method of image rejectionis presented. A passive sequence asymmetric polyphase ?lter and summing circuitare implemented. The experimental results show that the proposed down conver-sion and image rejection structure can satisfy the demands of GNSS multi-bandapplications.The design method and parameter de?nition are discussed. The improved low-IF architecture with one RF path and two di?erential IF paths is introduced basedon LNA and mixer design discussed above. The layout design is simpli?ed andthe power consumption is cuto?. The guideline of layout design is given to avoidinterference and smooth the signal ?ow. The tape-out result shows a good agreementwith the design method.An improved merged frontend for GNSS receiver, where the bias current and functions are reused in a stacked quadrature LNA-mixer-VCO (LMV), is exploredin the dissertation. The generation of self-oscillating signals and quadrature LOsignals are discussed. The gain plan and noise ?gure are discussed. The designdetails of sub-block are given. The experimental results give the technical referenceof the GNSS application.Although this study has made some innovations and achievements, there arealso some shortcomings. The practical production of the frontend and the discussionon isolation and stability of LMV need to be further carried out in the followingstudies.