A Low Phase Noise Phase-Locked Loop With Short Settling Times for Automotive Radar

Braun, Tobias T.; Delden, Marcel van; Bredendiek, Christian; Schoepfel, Jan; Pohl, Nils

doi:10.23919/eumic50153.2022.9783662

Cited by 5 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During stabilization, a limit is introduced based on the minimum divider value of the PLL. As described in [30], a higher reference can simultaneously improve a PLL's phase noise and settling time. Reducing the reference frequency to reach the lowest desired output frequency should, therefore, be avoided to not increase phase noise and settling time, as the latter would result in slower sweep times.…”

Section: Measurement Resultsmentioning

confidence: 99%

Overcoming the relative bandwidth limitations of single VCO frequency synthesizers by implementing a novel PLL architecture

Braun,

Schoepfel,

Marquez M.

et al. 2024

Int. J. Microw. Wireless Technol.

Self Cite

View full text Add to dashboard Cite

Frequency-modulated continuous-wave radar systems profit from increasing the absolute bandwidths of the generated frequency chirps to improve range resolution. As the relative bandwidth of SiGe-voltage-controlled oscillators (VCOs) is limited to about 80%, increasing the center frequency fundamentally or via frequency multiplication is the most direct way to increase that absolute bandwidth. However, as some applications require penetration depth, which dramatically decreases with frequency, other solutions are necessary. Therefore, state-of-the-art concepts rely on the down-conversion of generated frequency chirps via two separately stabilized frequency sources. This article implements a novel architecture, offering relative bandwidths of >100% within a single phase-locked loop (PLL). Therefore, two VCOs at different center frequencies are fed into a down-conversion mixer, whose output is directly stabilized via that PLL with one loop filter generating both tuning voltages. Those circuit blocks can be summarized as one equivalent VCO, offering a higher relative bandwidth and a significantly more linear tuning curve. Thereby, a solution to limited relative bandwidths with high VCO gain variation of single VCO synthesizers is offered while substantially reducing the hardware and implementation effort compared to the state-of-the-art.

show abstract

Section: Measurement Resultsmentioning

confidence: 99%

Overcoming the relative bandwidth limitations of single VCO frequency synthesizers by implementing a novel PLL architecture

Braun,

Schoepfel,

Marquez M.

et al. 2024

Int. J. Microw. Wireless Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Consequently, the measured beat frequency utilized for range determination may be affected, resulting in estimation errors and contributing to overall range inaccuracies. Extensive analysis of phase noise’s influence on FMCW systems is presented in [ 31 , 32 , 33 , 34 ]. The cumulative phase noise of the designed PLL is estimated and visualized in Figure 10 .…”

Section: Harmonic Radar Realizationmentioning

confidence: 99%

Harmonic FMCW Radar System: Passive Tag Detection and Precise Ranging Estimation

El-Awamry,

Zheng,

Kaiser

et al. 2024

Sensors

View full text Add to dashboard Cite

This paper details the design and implementation of a harmonic frequency-modulated continuous-wave (FMCW) radar system, specialized in detecting harmonic tags and achieving precise range estimation. Operating within the 2.4–2.5 GHz frequency range for the forward channel and 4.8–5.0 GHz for the backward channel, this study delves into the various challenges faced during the system’s realization. These challenges include selecting appropriate components, calibrating the system, processing signals, and integrating the system components. In addition, we introduce a single-layer passive harmonic tag, developed specifically for assessing the system, and provide an in-depth theoretical analysis and simulation results. Notably, the system is characterized by its low power consumption, making it particularly suitable for short-range applications. The system’s efficacy is further validated through experimental evaluations in a real-world indoor environment across multiple tag positions. Our measurements underscore the system’s robust ranging accuracy and its ability to mitigate self-interference, showcasing its significant potential for applications in harmonic tag detection and ranging.

show abstract

“…Our aim in this work is not to build a module that directly qualifies for the use in ngVLA. Rather, we test the capabilities of our integrated frequency synthesizer presented in [8] in this new context. Therefore, the realized LO module aims to generate frequencies inside the E-band with a very high reference frequency of 5 GHz.…”

Section: Radio Telescope Requirementsmentioning

confidence: 99%

“…Therefore in [8], we presented a PLL based on a monolithic microwave integrated circuit's (MMIC's) utilizing a loop bandwidth of 5 MHz and a reference frequency of 1 GHz to simultaneously obtain low phase noise and short settling times. Comparisons to the state of the art have highlighted its ability to generate low-phase-noise signals inside the automotive band ranging from 76 to 81 GHz.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A phase-locked loop with a jitter of 50 fs for astronomy applications

Braun

Delden

Bredendiek

et al. 2023

Int. J. Microw. Wireless Technol.

Self Cite

View full text Add to dashboard Cite

Radio telescopes are among the applications with the highest demands on a local oscillator (LO), which is used to receive and process the signals coming from the sky. Therefore the modules providing the required LO signal have traditionally been big and complicated. To overcome this disadvantage, we implement our own integrated frequency synthesizer inside a small LO module in this article. With this synthesizer we are able to achieve a jitter of only 50 fs integrated from 10 Hz to 2.5 GHz offset at a carrier frequency of 75 GHz. This is in part achieved by a very low in-band phase noise of −111.8 dBc at 10 kHz offset. The stabilizable frequency range is 62–88 GHz. Thus achieving promising results to fulfill this very demanding task with integrated frequency synthesizers in the future.

show abstract

A Low Phase Noise Phase-Locked Loop With Short Settling Times for Automotive Radar

Cited by 5 publications

References 7 publications

Overcoming the relative bandwidth limitations of single VCO frequency synthesizers by implementing a novel PLL architecture

Overcoming the relative bandwidth limitations of single VCO frequency synthesizers by implementing a novel PLL architecture

Harmonic FMCW Radar System: Passive Tag Detection and Precise Ranging Estimation

A phase-locked loop with a jitter of 50 fs for astronomy applications

Contact Info

Product

Resources

About