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A multi-constellation GNSS RF front-end with an integer-N PLL has been implemented for Compass and GPS applications in a 0.35μm SiGe BiCMOS process. A LNA in common-emitter topology with a noise figure of 1.7dB is integrated on the chip. An inter-N PLL based frequency synthesizer is designed to generate different local oscillator (LO) signals for down-converting the received Compass/GPS signals in...
A configurable Compass/GPS multiband GNSS RF receiver with wide bandwidth in a heterodyne radio topology is implemented in a 0.35μm SiGe BiCMOS process. By programming the synthesizer to generate different local oscillator (LO) signals, the proposed receiver downconverts GNSS signals in L1/B1/B2/B3 bands to an identical intermediate frequency (IF) of 46MHz. An automatic gain control (AGC) loop is...
With the development of GPS and wireless techniques, more and more applications require maintaining the current position of moving objects on road network environment. It is the key stone that how to built an efficient index to supporting very high rates of spatial-index updates. Previous works in this domain assume that system holds enough main memory to buffer operations. This specialty enable these...
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