共查询到20条相似文献,搜索用时 15 毫秒
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本文讨论了用双模介质加载谐振腔实现的微波线性相位滤波器结构,在非级联耦合的诸振腔之间引入一个交叉耦合,以改善通带内的时延平坦特性,给出了用模匹配法计算介质加载谐振腔的谐振频率和谐振腔之间耦合系数的方法。介绍了采用这种方法构成的滤波器的实际设计方法。最后制作了用这种方法设计出的滤波器,给出的实测结果表明它不仅可满足幅频特性的滤波要求,而且具有良好的通带时延特性。 相似文献
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In this paper, a nodal harmonic balance (HB) formulation is presented for the phase and amplitude noise analysis of free-running oscillators. The implications of using different constraints in the resolution of the perturbed-oscillator equations are studied. The obtained formulation allows the prediction of the possible spectrum resonances without ill conditioning at low frequency offset from the carrier. The noise spectrum is meaningfully expressed in terms of the eigenvalues of a newly defined matrix, obtained from the linearization of the nodal HB system about the steady-state solution. The cases of real or complex-conjugate dominant eigenvalues are distinguished. The developed phase-noise formulation is extended to a system of two coupled oscillators. The phase and amplitude noise analyses have been applied to a push-push oscillator at 18 GHz, a bipolar oscillator at 1 GHz, and a coupled system of two field-effect transistor oscillators at 6 GHz. 相似文献
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《Microwave Theory and Techniques》1985,33(12):1329-1332
A more detailed model for the transmission-mode dielectric resonator coupled between microstrip lines is given. Novel design approaches for parallel feedback oscillators and bandpass filters are discussed. For oscillators, the design mainly takes into account zero phase shift loop considerations, as in the classical low-frequency approach. Oscillators of this type may offer low phase noise. For filters, the spatial separation between dielectric resonators favors multipole designs. Using the same microstrip layout, different shapes and bandwidths may be obtained by simple tuning. 相似文献
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Ku波段低相噪锁相介质振荡器 总被引:2,自引:1,他引:1
应用取样锁相技术对Ku波段低相噪锁相介质振荡器进行了研究,对取样锁相技术的工作原理和电路特性进行了分析,阐述了取样锁相环路的设计过程.对制成的实物进行了测试和调试,取得了预期的相位噪声指标.实验结果表明,该取样锁相源的频率为17GHz,输出功率≥10dBm,杂波抑制比≥70dBc,相位噪声-103dBc/Hz@1kHz, -107dBc/Hz@10kHz, -110dBc/Hz@100kHz, -128dBc/Hz@1MHz. 相似文献
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针对高的相位噪声指标要求,对取样锁相介质振荡器进行了研究.通过相位噪声分析,明晰了采用介质振荡器与取样锁相技术降低相位噪声的机理,并分别对介质振荡器与锁相环路进行了设计.设计中,应用HFSS与ADS对介质振荡器进行了联合仿真,体现了计算机辅助设计的优势.最终研制出17 GHz锁相介质振荡器,测试结果为:输出功率13.1 dBm;杂波抑制>70 dB;谐波抑制>25 dB; 相位噪声为-105 dBc/Hz@1 kHz,-106 dBc/Hz@10 kHz,-111 dBc/Hz@100 kHz,-129 dBc/Hz@1 MHz. 相似文献
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运用串联反馈振荡器理论设计了一个工作于S波段的低相噪同轴介质压控振荡器。首先分析了同轴介质谐振器的理论以及串联反馈振荡器的工作原理,然后在高频电磁仿真软件HFSS和ADS中进行仿真和设计。为了实现电调谐,将变容管合理地加入振荡器,最终设计完成了一个S波段的低相噪同轴介质压控振荡器。通过对实物成品的测量和调试表明,此压控振荡器达到了预定的技术指标,各项性能良好。测试结果:工作频率为2.075~2.250 GHz,调谐范围为1.75 GHz,输出功率≥11 dBm,谐波抑制度≥23 dBc,相位噪声优于-133 dBc/Hz@100kHz。 相似文献
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《Microwave Theory and Techniques》1987,35(3):349-352
Optimization of low-frequency Ioading allows reduction of 1/f converted noise in FET oscillators. Moreover, an appropriate low-frequency feedback between drain and gate gives an improvement over previous results. This improvement is explained by taking into account the properties of the noise autocorrelation function. 相似文献
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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. 相似文献
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Yakimov A. V. Klyuev A. V. Krevskii M. A. 《Journal of Communications Technology and Electronics》2020,65(1):84-89
Journal of Communications Technology and Electronics - The nature of introduced phase 1/f (flicker) noise in an amplifier of a microwave oscillator that contains an isolating element (directional... 相似文献
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针对微波通信、雷达、电子战和导航等先进电子系统的应用发展需求,为了实现具有实用价值的极低相噪耦合微波光电振荡信号产生,提出了一种基于Sigma型光纤储能环腔架构的低相噪启钥式耦合微波光电振荡器。该方案通过Sigma型光纤储能技术消除了耦合微波光电振荡器中存在的偏振衰落问题,并且通过有源光纤环腔再生增益特性极大增强了振荡器品质因数,最终实现了10 GHz耦合微波光电振荡器的开机启钥稳定运行,起振信号在10 kHz频偏处的相位噪声达到-139.26 dBc/Hz。 相似文献
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A low phase noise quadrature oscillator using the new injection locked technique is proposed.The incident signal is directly injected into the common-source connection of the sub-harmonic oscillator.In principle,the phase noise performance of the quadrature output is better than the sub-harmonic oscillator itself.The quadrature oscillator is implemented in a 0.25μm CMOS process.Measurements show the proposed oscillator could achieve a phase noise of -130dBc/Hz at 1MHz offset from 1.13GHz carrier while only drawing an 8.0mA current from the 2.5V power supply. 相似文献
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《Antennas and Propagation, IEEE Transactions on》2009,57(8):2252-2259
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《Quantum Electronics, IEEE Journal of》2009,45(2):178-186
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O'Doherty F. Gleeson J. P. 《Circuits and Systems II: Express Briefs, IEEE Transactions on》2007,54(5):435-439
The phase diffusion coefficient and the mean frequency of a two-dimensional nonlinear oscillator perturbed by colored noise is theoretically predicted and compared with numerical simulations of the Langevin system. At high oscillator frequencies, the first-order perturbation approximation of Demir is observed to yield inaccurate results for the phase diffusion coefficient when the spectrum of the noise sources decay faster than omega-2. A novel asymptotic approach which describes the diffusion coefficient in such instances is developed 相似文献
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《Microwave Theory and Techniques》1985,33(3):233-242
The upconversion of Iow-frequency noise in microwave FET oscillators is investigated. The theoretical analysis is presented in two forms, a general and a simplified one. The latter version yields closed-form expressions for amplitude and phase noise, which are discussed wfth regard to the physics of the upconversion process. Application of the method is demonstrated with an example. 相似文献