Invention Grant
US09584142B2 Fractional N frequency synthesizer and setting method thereof 有权
分数N频率合成器及其设置方法

Fractional N frequency synthesizer and setting method thereof
Abstract:
The calculator calculates the remainder of the division of which the dividend is the minimum accumulated value at which a carryover occurs in the ΔΣ modulator and the devisor is a fractional set value, and calculates the quotient and remainder of the division of which the dividend is the devisor of the previous division and the devisor is the remainder of the previous division until the remainder becomes zero. The abnormal noise determiner determines that the fractional set value causes periodic abnormal noise based on the quotients calculated by the calculator using the fractional set value. The fractional setter sets in the ΔΣ modulator the fractional set value changed to the extent that the output frequency of the VCO does not exceed a given value when the abnormal noise determiner determines that the changed fractional set value does not cause periodic abnormal noise.
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