• Title/Summary/Keyword: Planar Oscillator

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Design of a Planar Cavity Resonator for 12.5 GHz Low Phase Noise SiGe HBT Oscillator

  • Lee Jae-Woo;Kim Yong-Hoon
    • Journal of electromagnetic engineering and science
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    • v.5 no.4
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    • pp.153-160
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    • 2005
  • In this paper, the novel microwave oscillator incorporating a planar cavity resonator(PCR) is presented to reduce the phase noise of the oscillator in a planar environment. Compared to the conventional planar( $\lambda$/4 open stub resonator), the phase noise is improved about 16 dBc/Hz @100 kHz. The design of the oscillator is based on a reflection type configuration using the low 1/f SiGe HBT transistor(LPT16ED). The output power is measured 2.76 dBm at 12.5 GHz. In this paper, the oscillator used to the PCR can be expected to provide a solution for low phase noise oscillator in microwave circuits.

Novel Phase Noise Reduction Method for CPW-Based Microwave Oscillator Circuit Utilizing a Compact Planar Helical Resonator

  • Hwang, Cheol-Gyu;Myung, Noh-Hoon
    • ETRI Journal
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    • v.28 no.4
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    • pp.529-532
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    • 2006
  • This letter describes a compact printed helical resonator and its application to a microwave oscillator circuit implemented in coplanar waveguide (CPW) technology. The high quality (Q)-factor and spurious-free characteristic of the resonator contribute to the phase noise reduction and the harmonic suppression of the resulting oscillator circuit, respectively. The designed resonator showed a loaded Q-factor of 180 in a chip area of only 40% of the corresponding miniaturized hairpin resonator without any spurious resonances. The fully planar oscillator incorporated with this resonator showed an additional phase noise reduction of 10.5 dB at a 1 MHz offset and a second harmonic suppression enhancement of 6 dB when compared to those of a conventional CPW oscillator without the planar helical resonator structure.

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An Oscillator Incorporating a Planar Helical Resonator for Phase Noise Reduction and Harmonic Suppression

  • Hwang Cheol-Gyu;Myung Noh-Hoon
    • Journal of electromagnetic engineering and science
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    • v.6 no.3
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    • pp.160-164
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    • 2006
  • This paper describes a compact printed helical resonator and its application to a microwave oscillator circuit implemented in coplanar waveguide(CPW) technology. The high Q-factor and spurious-free characteristic of the resonator contribute to the phase noise reduction and the harmonic suppression of the resulting oscillator circuit, respectively. The designed resonator resonating at the frequency of 5.5 GHz showed a loaded Q of 180 in a chip area of only 40 % of the corresponding miniaturized hairpin resonator without any spurious resonances. The fully planar oscillator incorporated with this resonator showed additional phase noise reduction of 10.5 dB at 1 MHz offset and a second harmonic suppression enhancement of 6 dB when compared to those of a conventional CPW oscillator without the planar helical resonator(PHR) structure.

Design of transistor oscillator for X-band application using a pair of L-shaped monopole slot resonator (한 쌍의 L-형 모노폴 슬롯 공진기를 이용한 X-밴드 트랜지스터 발진기 설계)

  • Lee, Yeong-min;Lee, Young-soon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.21 no.1
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    • pp.107-114
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    • 2021
  • In this paper, a planar transistor oscillator for X-band using a newly proposed L-shaped monopole slot resonator is proposed. For planar design, an L-shaped monopole slot with an open-end is used as a resonator for a transistor oscillator. As a result of the simulated design of the resonator in three stages, a high Q value of 1169.84 and a high insertion loss of 49.934 dB were identified. The results of the final design and manufactured oscillator measurements confirmed that the oscillation output is greater than 7 dBm and has good phase noise characteristics of -58 dBc/Hz at 100 kHz offset. The proposed oscillator is planar and has the advantage of being directly applicable to microwave integrated circuit technology. It also has the advantage of being able to reduce its size as it can only be implemented in microstrip form without additional devices such as metal cavities and tuning screws in 3D structures, as in the case of a DRO (dielectric resonance oscillator).

Evaluations of Three Phase Shift Models in Describing Phase Shift Impulse Train Response of a Simple Planar Oscillator (간단한 2차원 오실레이터의 임펄스열 응답에 관한 3가지 위상편이 모델의 평가)

  • Jeon, Man-Young
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.8
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    • pp.861-866
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    • 2014
  • This study evaluates the modeling accuracy of the existing three phase shift models on which the time domain oscillator phase noise theories are based. For the evaluation, this study investigates how accurately the three models can model the phase shift impulse train response of a simple planar oscillator. Evaluation result reveals that Kaertner model most accurately reflects the oscillator's phase shift impulse train responses for five different impulse train inputs, whereas PP model exhibited the worst performance in modeling the phase shift impulse train responses.

Accuracy Comparison of Existing 3 Models in Estimating Time-Varying Variance of Phase Deviation of a Simple Planar Oscillator (간단한 평면 오실레이터의 위상 천이의 시변 분산에 대한 기존 3개 모델의 추정 정확도 비교)

  • Jeon, Man-Young
    • Journal of IKEEE
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    • v.19 no.4
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    • pp.500-505
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    • 2015
  • Through Montecarlo simulation, this study compares how accurately the existing three phase deviation models estimate the time-varying variance of a planar oscillator perturbed by Gaussian noises. The comparison reveals that Kaertner model estimates the time-varying variance with about 1000 times higher accuracy than ISF or PP model exhibits. Additionally, it finds that the estimation accuracy of PP model is somewhat higher than that of ISF model.

Implementation of Voltage Controlled Oscillator Using Planar Structure Split Ring Resonator (SRR) (평면형 구조의 분리형 링 공진기를 이용한 전압제어 발진기 구현)

  • Kim, Gi-Rae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.7
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    • pp.1538-1543
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    • 2013
  • In this paper, a novel split ring resonator is proposed for improvement of phase noise characteristics that is weak point of oscillator using planar type microstrip line resonator. Oscillator using proposed split ring resonator is designed, it has improved phase noise characteristics. At the fundamental frequency of 5.8GHz, 7.22dBm output power and -83.5 dBc@100kHz phase noise have been measured for oscillator with split ring resonator. The phase noise characteristics of oscillator is improved about 9.7dB compared to one using the general ${\lambda}/4$ microstrip resonator. Next, we designed voltage controlled oscillator using proposed split ring resonator with varactor diode. The VCO has 125MHz tuning range from 5.833GHz to 5.845GHz, and phase noise characteristic is -118~-115.5 dBc/Hz@100KHz. Due to its simple fabrication process and planar type, it is expected that the technique in this paper can be widely used for low phase noise oscillators for both MIC and MMIC applications.

X-Band Oscillator Using SIW Cavity Resonator Based on Planar Circuit Technique (평면회로 기법에 의한 SIW Cavity 공진기를 이용한 X-밴드 발진기)

  • Lee, Hyun-Wook;Lee, Il-Woo;Nam, Hee;Lee, Jong-Chul
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.7 no.1
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    • pp.68-74
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    • 2008
  • The substrate integrated waveguide (SIW) structure can be approximated as the rectangular waveguide using common dielectric substrate with via-holes. To realize reflection-type resonator, $50-{\omega}$ microstrip line can be used for coupling with the center plane of the cavity. The oscillator is designed to operate at 9.45 GHz using the reflection-type SIW cavity resonator. The phase noise of oscillator shows -98.1dBc/Hz at 100 KHz offset. In experiment, the reflection type SIW cavity resonator improves the loaded quality factor making the low phase noise oscillator possible. Due to the entirely planar structure of this resonator, this technique can also be adequate in oscillator applications for a low cost and low phase noise performance.

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An X-band Low Phase Noise MMIC Oscillator Using a Planar-Type MMIC Resonator (평면형 MMIC 공진기를 이용한 낮은 위상잡음을 갖는 X 대역 MMIC 발진기)

  • Lee, Mun-Gyu;Jo, Il-Hyeon;Choe, Jong-Won
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.6 no.1 s.12
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    • pp.38-46
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    • 2007
  • In this paper an X-band low phase noise HBT oscillator using a planar type MMIC resonator is designed. The chip area of the proposed resonator shows a quarter of the conventional hair-pin resonator using distributed transmission lines. The measurement results show oscillation frequency of 8.295 GHz, the power output of 4.8 dBm, and phase noise characteristic of -106.8 dBc/Hz and -121.7 dBc/Hz at 100 kHz and 1 MHz offset frequencies respectively.

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