Phase Noise Analysis of PLL Based Frequency Synthesizers for Multi-Radio Mobile Terminals

Valenta, Václav; Baudoin, Geneviève; Villegas, Martine

doi:10.1109/crowncom.2008.4562555

Cited by 11 publications

(5 citation statements)

References 9 publications

(5 reference statements)

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“…In the PLL-based frequency synthesizers, the phase noise performance is determined by a superposition of two main noise sources: the reference oscillator noise and the VCO noise. The superposition process saves the fundamental nature described above [19], therefore, the reduction of the loss peaks for high velocities also apply for PLL frequency source architecture. Although, the magnitude and low-power characteristics of the phase noise for different source architectures change from one to another, causing different reduction of the loss peaks for high velocities.…”

Section: Lpfmentioning

confidence: 99%

Coherent Integration Loss Due to Nonstationary Phase Noise in High-Resolution Millimeter-Wave Radars

2021

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Phase noise refers to the instability of an oscillator, which is the cause of instantaneous phase and frequency deviations in the carrier wave. This unavoidable instability adversely affects the performance of range–velocity radar systems, including synthetic aperture radars (SARs) and ground-moving target indicator (GMTI) radars. Phase noise effects should be considered in high-resolution radar designs, operating in millimeter wavelengths and terahertz frequencies, due to their role in radar capability during the reliable identification of target location and velocity. In general, phase noise is a random process consisting of nonstationary terms. It has been shown that in order to optimize the coherent detection of stealthy, fast-moving targets with a low radar cross-section (RCS), it is required to evaluate the integration gain and to determine the incoherent noise effects for resolving target location and velocity. Here, we present an analytical expression for the coherent integration loss when a nonstationary phase noise is considered. A Wigner distribution was employed to derive the time–frequency expression for the coherent loss when nonstationary conditions were considered. Up to now, no analytical expressions have been developed for coherent integration loss when dealing with real nonstationary phase noise mathematical models. The proposed expression will help radar systems estimate the nonstationary integration loss and adjust the decision threshold value in order to maximize the probability of detection. The effect of nonstationary phase noise is demonstrated for studying coherent integration loss of high-resolution radar operating in the W-band. The investigation indicates that major degradation in the time-frequency coherent integration due to short-term, nonstationary phase noise instabilities arises for targets moving at low velocities and increases with range. Opposed to the conventional model, which assumes stationarity, a significant difference of up to 25 dB is revealed in the integration loss for radars operating in the millimeter wave regime. Moreover, for supersonic moving targets, the loss peaks at intermediate distances and then reduces as the target moves away.

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Section: Lpfmentioning

confidence: 99%

Coherent Integration Loss Due to Nonstationary Phase Noise in High-Resolution Millimeter-Wave Radars

2021

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“…In the field of wireless communication, cognitive radio multi-mobiles terminals are an interesting topic. Such terminals are to perform an efficient environment spectrum scanning in order to switch accordingly to an appropriate communication standard [37]. They require frequency synthesizers from 880 MHz up to 5.8 GHz.…”

Section: Other Applicationsmentioning

confidence: 99%

An integrated 8-12 GHz fractional-N frequency synthesizer in SiGe BiCMOS for satellite communications

Peters

Osmany

et al. 2010

Analog Integr Circ Sig Process

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We present an integrated fractional-N lownoise frequency synthesizer for satellite applications. By using two integrated VCOs and combining digital and analog tuning techniques, a PLL lock range from 8 to 12 GHz is achieved. Due to a small VCO fine tuning gain and optimized charge pump output biasing, the phase noise is low and almost constant over the tuning range. All 16 sub-bands show a tuning range above 900 MHz each, allowing temperature compensation without sub-band switching. This makes the synthesizer robust against variations of the device parameters with process, supply voltage, temperature and aging. The measured phase noise is -87 dBc/Hz and -106 dBc/Hz at 10 kHz and 1 MHz offset, respectively. In integer-N mode, phase noise values down to -98 dBc/Hz at 10 kHz and -111 dBc/Hz at 1 MHz offset, respectively, were measured.

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“…The output frequency that is fed through a frequency divider back to the input produces a negative feedback loop. [2] …”

Section: Introductionmentioning

confidence: 99%

Analysis of Performance factors for PLL based Frequency Synthesizers for Wireless Applications and Impact on Overall Performance

Venkateswararao¹,

Ramesh²

2012

IJCA

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This paper presents the PLL based Frequency Synthesizers, which are used in modern devices for generating wide range of frequencies. The Performance depends on several factors such as phase noise, spurious outputs, loop bandwidth and lock time. The parameters loop bandwidth and lock time are inter-related which are inversely proportional to each other is simulated and the results are given. The Phase Noise for the VCO depends on the frequency range in which it is used and given by Lesson's equation. It varies linearly and L-Band and higher frequencies but varies at 6dB per octave at lower frequencies in hundreds of MHz or tenths of GHz. The results are simulated in MATLAB and presented in this paper.

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Phase Noise Analysis of PLL Based Frequency Synthesizers for Multi-Radio Mobile Terminals

Cited by 11 publications

References 9 publications

Coherent Integration Loss Due to Nonstationary Phase Noise in High-Resolution Millimeter-Wave Radars

Coherent Integration Loss Due to Nonstationary Phase Noise in High-Resolution Millimeter-Wave Radars

An integrated 8-12 GHz fractional-N frequency synthesizer in SiGe BiCMOS for satellite communications

Analysis of Performance factors for PLL based Frequency Synthesizers for Wireless Applications and Impact on Overall Performance

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