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首页> 外文期刊>Circuits and Systems II: Express Briefs, IEEE Transactions on >A Low Phase Noise Open Loop Fractional-N Frequency Synthesizer With Injection Locking Digital Phase Modulator
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A Low Phase Noise Open Loop Fractional-N Frequency Synthesizer With Injection Locking Digital Phase Modulator

机译：具有喷射锁定数字相位调制器的低相噪声开环分数-N频率合成器

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摘要

This brief presents a two stage open loop fractional-N frequency synthesizer using proposed injection locking phase modulator for low power applications. A novel low power injection locking oscillator (ILO)-based digital phase modulator (DPM) is proposed in this brief. The maximum differential nonlinearity (DNL) of proposed DPM is smaller than 0.3 degree in the whole range with 1.6 mW power consumption. An integer-N injection locking phase locked loop (ILPLL) is designed to generate the radio frequency signals for the second stage open loop frequency synthesizer. With an injection strength adjustment unit, the open loop fractional-N frequency synthesizer employing proposed DPM achieved excellent in band phase noise and instantaneous frequency switching with low power consumption. This frequency synthesizer is fabricated on 28-nm CMOS technology and its active area is 0.08 mm(2). The output frequency range is from 320 MHz to 520 MHz and the power dissipation is 2.7 mW from 0.9 V supply in fractional-N mode. The measured RMS jitter integrated phase noise from 10 KHz to 40 MHz of 440 MHz and 440.4 MHz carrier frequency are 3.8 ps and 17.6 ps, respectively. The corresponding figure of merits (FoM) are -231 dB and -211 dB, respectively.
机译：本发明简述了一种双级开环分数N频率合成器，使用所提出的注射锁定相位调制器进行低功率应用。在此简介中提出了一种新颖的低功率注入锁定振荡器（ILO）的数字调制器（DPM）。所提出的DPM的最大差分非线性（DNL）小于整个范围内的0.3度，功耗为1.6 MW。设计为整数喷射锁相锁相环（ILPLL），设计为为第二级开环频率合成器产生射频信号。利用注射强度调节单元，开环分数-N频率合成器采用所提出的DPM，具有低功耗的带相位噪声和瞬时频率切换的优异。该频率合成器以28-nm CMOS技术制造，其有源区为0.08mm（2）。输出频率范围为320 MHz至520 MHz，功率耗散在分数-N模式下从0.9 V电源的2.7 mW。测量的RMS抖动集成阶段噪声从10kHz到40MHz的440MHz和440.4MHz载波频率分别为3.8 ps和17.6 ps。相应的优点（FOM）图分别为-231dB和-211dB。

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