CMOS Single Chip Fast Frequency Hopping Synthesizers for by Taoufik Bourdi

By Taoufik Bourdi

During this publication, the authors define specific layout method for speedy frequency hopping synthesizers for RF and instant communications functions. there's nice emphasis on fractional-N delta-sigma established section locked loops from requirements, procedure research and structure making plans to circuit layout and silicon implementation. The built recommendations within the booklet might help in designing very low noise, excessive pace fractional-N frequency synthesizers.

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The size of the accumulator used depends on the frequency error as well as the sampling frequency. Frac is usually represented by a fraction whose integer numerator is called K and whose integer denominator is called F. Since the overflow controlling the DMD changes the value of the divider from N + 1 to N within the cycle, this resets the phase error at the output of the PFD, generating signals that modulate the VCO and appear at the output of the VCO. These signals are deterministic in nature and can be predicted, they are often termed fractional spurious signals [13].

5 Dividers There are two types of dividers. The ones used as reference dividers; those are usually low frequency. The others are high- frequency dividers and those are used as feedback dividers. Detailed circuit topologies of synchronous and asynchronous, as well as dual-modulus prescaler dividers are found in the Appendix. 3 PHASE-LOCKED LOOP PARAMETERS PLLs are of nonlinear nature. To simplify their analyses, a linear approximation is often used. Important parameters that describe the PLL are the open-loop and closed-loop transfer functions, as well as the phase noise functions.

E. Best, Phase Locked-Loop Design Simulation and Applications, 3rd edn. MacGraw-Hill, New Jersey, 1997. M. ” IEEE Transactions on Communication, COM-28:1849–1858, Nov. 1980. Description of the charge pump mechanism in a PLL. -G. Goldberg. Digital Techniques in Frequency Synthesis, MacGrawHill, New Jersey, 1996. -G. Goldberg, “Analog and Digital Fractional-n PLL Frequency Synthesis: A Survey and Update,” Applied microwave and wireless, June 1999. Tutorial presenting fractional-N frequency synthesis.

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