A Millimeter-Wave Highly Linear VCO MMIC with Compact Tuning Voltage Converter

Mizutani, Hiroyuki; Tsuru, Masaomi; Matsuzuka, Takayuki; Choumei, K.; Kawakami, Kenji; Miyazaki, Moriyasu

doi:10.1109/eumc.2006.281482

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…For frequency modulation nonlinearities, current research includes both hardware and software correction methods. Hardware techniques include using predistortion technique to compensate for nonlinearity in voltage-controlled oscillator (VCO) response characteristics [12], correcting varactor tuning curves by a tuning voltage converter [13], using direct digital synthesizers (DDSs) [14] and phased-locked loops (PLL) [15]. However, they not only raise the cost but also increase the complexity of the system.…”

Section: Introductionmentioning

confidence: 99%

A Clutter Identification and Removal Method Based on Long Delay Lines and Cross-Correlation in Through-Wall Detection

Yuan,

Ji,

et al. 2024

Applied Sciences

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Life detection is important in earthquake rescue, but weak vital signal is susceptible to interference by clutters. Due to the undesirable characteristics of the hardware, there are two main types of clutter generated by the frequency modulation continuous wave (FMCW) radar when transmitting signals. One is generated by periodic nonlinearity during frequency modulation, and the other is generated by the phase-locked loop spuriousness (PLLS) in frequency division. They cause additional beat frequencies to appear beside those from the target, leading to false alarms. Since the suppression measures for them are different, it is necessary to distinguish the types of clutter and choose appropriate suppression methods. In this paper, the accurate theoretical modeling of the effects of the periodic nonlinearity and phase-locked loop spuriousness on the beat signal is performed to determine distinctions between them. The clutter occurring in the system used is identified as originating from phase-locked loop spuriousness through fiber-optic experiments. A method using long delay lines and cross-correlation is proposed to identify and remove it. In experiments, the false alarm rate is reduced from over 50 percent to nearly 0 percent, providing strong evidence for the effectiveness of the proposed method in through-wall detection.

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Section: Introductionmentioning

confidence: 99%

A Clutter Identification and Removal Method Based on Long Delay Lines and Cross-Correlation in Through-Wall Detection

Yuan,

Ji,

et al. 2024

Applied Sciences

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“…However, digitallycontrolled oscillator is very complicated and computationintensive. The voltage converter principle in [10] is to compensate linearity error in VCO tuning curve with voltage converter tuning curve but practically, it's almost impossible to model and tune voltage converter curve to be inversely matched with the characteristics curve of VCO, especially in analog circuits. Another technique is to reduce latch delay using double-differential latching comparator [1].…”

Section: Introductionmentioning

confidence: 99%

High linearity voltage-controlled oscillator

Low

Yao

2009

2009 IEEE 8th International Conference on ASIC

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A linearization technique for CMOS voltagecontrolled oscillators (VCOs) is presented. The linearity ofthe oscillator is improved by applying a feedback loop using a switched-capacitor network as a frequency-to-voltage converter (FVC). The technique is verified by circuit-level simulation using parameters of a O.35-f.1m CMOS technology. After the linearization, the linearity error of VCO can be improved to less than 0.015% for a dynamic range of60 dB. Index Terms -Voltage-controlled oscillator, high linearity, frequency feedback loop

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