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Feng Y.,Xian Jiaotong University | Luo Y.,Huaxun Microelectronics | Chen G.,Xian Jiaotong University
Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University | Year: 2013

To solve the problem of stability of the multi-mode frequency synthesizer during mode transitions, a method of stabilizating the loop bandwidth is presented by means of calibrating the charge pump current according to the divider ratio. The method makes the variation of the loop bandwidth to be kept within a smaller range at different division ratios. A multi-mode fractional-N synthesizer adopting the method can work stably in seven modes of three positioning systems.Simulation results show that the variation of normalized ICPKVCO/ωVCO in seven modes is in the range of -3.3% and 3.3%. For each mode, the in-band and out-of-band phase noises are not larger than -93 dBc/Hz and -119 dBc/Hz, respectively. The setting time is less than 24 μs. The total power consumption is 15.21 mW at 1.8 V voltage supply. Source


Huaxun Microelectronics | Entity website

58 710075 029-62960588 029-62960588-819 IP-CORE HX9311 HX9311 GPS L1 B1B2B3GLONASS L146MHz 62MHz 4ADC. [] HX8411 HX8411 0 ...


Huaxun Microelectronics | Entity website

58 710075 029-62960588 029-62960588-819 Copyright2012 : ICP06007492 58 710075 029-62960588 029-62960588-819 Emailyjdang@fast-china.com


Huaxun Microelectronics | Entity website

58 710075 029-62960588 029-62960588-819 1/1 12 11 Copyright2012 : ICP06007492 58 710075 029-62960588 029-62960588-819 Emailyjdang@fast-china.com

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