Reduced complexity, high performance digital delta-sigma modulator for fractional-N frequency synthesis
نویسندگان
چکیده
This paper presents the design consideration of high order digital AZ modulators used as modulus controller for fractional-N frequency synthesizer. A third-order MASH structure (MASH 1-2) is designed and implemented which allows for the input to operate over 75% of the input adder capacity. The number of the output levels is reduced to two bits. The circuit was verified through simulation, ASIC implementation and exhibits high potential for a gigahertz range, low-power monolithic CMOS frequency synthesizer.
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