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Design of low noise fractional-N frequency synthesizer using sigma-delta modulation technique

机译:利用sigma-delta调制技术设计低噪声分数N频率合成器

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The fractional-N frequency synthesis technique provides agile switching in narrow channel spacing systems and alleviates phase-locked loop (PLL) design constraints for phase noise and reference spur. A sigma-delta modulator is represented in this work which reduces spur in output frequency spectrum of the fractional-N frequency synthesizers (FS). This technique also improves the performance of the frequency synthesizer. A fractional-N frequency synthesizer is designed by employing a third-order MASH modulator. A fourth order type II PLL with two out of band poles are used to suppress quantization noise of the modulator. The in-band phase noise of −95 dBc/Hz at 10-kHz offset with a spur of less than −96 dBc is achieved with a reference frequency of 8 MHz and a loop bandwidth of 40 kHz.
机译:小数N分频频率合成技术可在窄通道间隔系统中提供灵活的切换功能,并减轻了相位噪声和参考杂散的锁相环(PLL)设计约束。这项工作代表了一个sigma-delta调制器,它减少了分数N频率合成器(FS)的输出频谱中的杂散。该技术还提高了频率合成器的性能。通过采用三阶MASH调制器来设计分数N频率合成器。具有两个带外极点的四阶II型PLL用于抑制调制器的量化噪声。在参考频率为8 MHz且环路带宽为40 kHz的情况下,在10 kHz偏移下的杂散小于-96 dBc时,带内相位噪声为-95 dBc / Hz。

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