How Low Can They Go?: Oscillator Phase Noise Model, Theoretical, Experimental Validation, and Phase Noise Measurements

Poddar, Ajay K.; Rohde, Ulrich L.; Apte, Anisha M.

doi:10.1109/mmm.2013.2269859

Cited by 43 publications

(19 citation statements)

References 59 publications

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“…Conventionally, phase noise is characterized via mixing of two microwaves signals 15 , regardless of whether cross correlation is used or not. In addition to the device under test (DUT), a second low noise microwave reference source is required, which need to be synchronized to the DUT.…”

Section: Introductionmentioning

confidence: 99%

Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves

Kuse¹,

Fermann²

2017

Sci Rep

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Recent progress in ultra low phase noise microwave generation indispensably depends on ultra low phase noise characterization systems. However, achieving high sensitivity currently relies on time consuming averaging via cross correlation, which sometimes even underestimates phase noise because of residual correlations. Moreover, extending high sensitivity phase noise measurements to microwaves beyond 10 GHz is very difficult because of the lack of suitable high frequency microwave components. In this work, we introduce a delayed self-heterodyne method in conjunction with sensitivity enhancement via the use of higher order comb modes from an electro-optic comb for ultra-high sensitivity phase noise measurements. The method obviates the need for any high frequency RF components and has a frequency measurement range limited only by the bandwidth (100 GHz) of current electro-optic modulators. The estimated noise floor is as low as −133 dBc/Hz, −155 dBc/Hz, −170 dBc/Hz and −171 dBc/Hz without cross correlation at 1 kHz, 10 kHz, 100 kHz and 1 MHz Fourier offset frequency for a 10 GHz carrier, respectively. Moreover, since no cross correlation is necessary, RF oscillator phase noise can be directly suppressed via feedback up to 100 kHz frequency offset.

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Section: Introductionmentioning

confidence: 99%

Electro-optic comb based real time ultra-high sensitivity phase noise measurement system for high frequency microwaves

Kuse¹,

Fermann²

2017

Sci Rep

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“…Therefore, it is possible to measure DUT (oscillator) with lower noise than the reference oscillators, because noise contributions from the reference oscillator are suppressed considerably. The practical value of the noise floor is [3]:…”

Section: A Phase Noise Measurement Techniquesmentioning

confidence: 99%

“…Table 1 shows the comparative analysis of 3-most cited phase noise models, their relative strength and weakness for the characterization of oscillator phase noise [2]- [3]. All the 3-models discussed in Table 1 explain and predict the phase noise of autonomous circuits (oscillators), and one can argue the superiority of any of the three models based on accuracy, reliability, simulation time, and convergence for a given oscillator circuit topology.…”

Section: Introductionmentioning

confidence: 99%

Phase noise measurement: Challenges and uncertainty

Poddar

Rohde

Rubiola

2014

2014 IEEE International Microwave and RF Conference (IMaRC)

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“…No endorsement is implied. 5 MHz quartz-crystal oscillator; it displays simultaneously the effect of both positive correlation above 10 kHz offset and negative correlation around 10 Hz offset. One cause of the noise under-estimation as explained in [8] can occur due to the anti-correlation (phase-inversion) collapse mainly from AM noise leakage.…”

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confidence: 99%

“…Despite being commonly used, this technique is susceptible to experimental errors [5], [6]. One among many of these errors is caused either by positive or negative correlations resulting in over-estimation or under-estimation respectively of the oscillator noise [7], [8].…”

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confidence: 99%