			Home About us Contact

Phase Noise (phase + noise)

Distribution by Scientific Domains

Engineering	100%

Distribution within Engineering

Communication Technology	88%
General & Introductory Electrical & Electronics Engineering	7%

Selected Abstracts

Effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2010
Vikram Sekar
Abstract The effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches is investigated in this article. It is shown that the phase noise of a tunable filter is dependent on the input power, fractional bandwidth, filter order, resonator quality factor, and tuning state. Phase noise is higher for filters with smaller fractional bandwidth. In filters with high fractional bandwidth (>3%), phase noise increases as the input power approaches the power-handling capability of the filter. In filters with smaller bandwidths, phase noise increases with input power upto a threshold level of input power, but begins to decrease thereafter. The unloaded quality factor of the filter has a noticeable effect on the phase noise of filters with narrow bandwidths. The phase noise changes with the filter tuning state and is maximum when all the switches are in the up-state position. It is also shown that the phase noise increases with the filter order, due to increase in the number of noisy elements in the filter structure. This article provides a methodology to evaluate the phase noise of a tunable filter and proves that RF MEMS filters are suitable for high performance applications without considerable phase-noise penalty. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010. [source]

A digitally controlled band-switching VCO using switching inductors and capacitors in 0.18 ,m CMOS

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2008
Tienyu Chang
Abstract In this article, a digitally controlled band-switching voltage controlled oscillator (VCO) is designed and fabricated using TSMC 0.18 ,m CMOS technology. Design considerations regarding the power requirement and the phase noise of the VCO are discussed. Eight bands are set by three bits, with one bit controlling switching inductors, and two bits controlling switching capacitors. The VCO covers 2.9,3.45 GHz and 3.6,4.3 GHz using varactors for continuous frequency tuning. Phase noise of the VCO stays constant around ,110 dBc/Hz at 1 MHz offset for all bands. The fabricated VCO consumes 11 mA of current with 1.8 V supply voltage and has a small size of 730 ,m × 660 ,m. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1970,1973, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23496 [source]

Joint compensation of IQ imbalance, frequency offset and phase noise in OFDM receivers,

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 3 2004
Jan Tubbax
Zero-IF receivers are getting a lot of attention because of their potential to enable low-cost OFDM terminals. However, zero-IF receivers also introduce IQ imbalance which can have a huge impact on the performance. Rather than increasing component cost to decrease the IQ imbalance, an alternative is to tolerate the IQ imbalance and compensate for it digitally. Current solutions either require additional analog hardware or are based on digital algorithms that converge too slowly for bursty communication. Moreover, the impact of a frequency offset and phase noise on the IQ imbalance estimation/compensation problem is not considered. In this paper, we analyze the joint IQ imbalance/frequency offset/phase noise estimation and propose a low-cost, highly effective, all-digital mitigation scheme. For large IQ imbalance large frequency offsets and in the presence of phase noise our solution still results in an average implementation loss below 0.5,dB. It, therefore, enables the design of low-cost, lowcomplexity OFDM receivers. Copyright © 2004 AEI [source]

LC-active VCO for CMOS RF transceivers

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 1 2010
Domenico Zito
Abstract A novel fully integrated CMOS LC tank VCO is presented. The LC tanks are implemented by exploiting the active circuit ,boot-strapped inductor' (BSI), which behaves like a high-quality factor inductor. Particularly, the LC tanks have been implemented by introducing a new version of the CMOS BSI circuit, which provides better versatility and design reliability. In order to verify the effectiveness of such an approach, a case study for 5,6,GHz direct-conversion multi-standard WLAN transceivers is presented. The VCO has been designed in a 0.35µm standard CMOS technology. The new BSI exhibits a high-quality factor (higher than 25 over the all frequency range) and provides a high selectivity without introducing a relevant excess of noise, for a better spectral purity and a lower phase noise (PN) of the VCO. The overall VCO circuit consumes 9,mW. The VCO produces an oscillation in the tuning range from 4.91 to 5.93,GHz (nearly equal to 19%). The circuit exhibits a PN of ,129dBc/Hz at 1,MHz of frequency offset from the central frequency (5.4,GHz) and a FOM equal to 189.5,dBc/Hz at 100,kHz and 194.1,dBc/Hz at 1,MHz of frequency offset, respectively. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Mixed-mode analysis of the sensitivity of a radiofrequency oscillator disturbed by parasitic signals

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS, DEVICES AND FIELDS, Issue 1 2009
Christian Gontrand
Abstract The first step of this work is to study the susceptibility of a radiofrequency oscillator to deterministic disturbance sources. A Colpitts oscillator, working around a 4,GHz frequency, contains a heterojunction bipolar transistor with a silicon,germanium base as an active device. A mixed-mode analysis is involved, applying a microscopic drift diffusion model to the device, whereas the rest of the circuit used is governed by Kirchhoff's laws. We assume that this tool is very relevant to grasp the influence of intrinsic or extrinsic noisy sources of the oscillator. Our first simulation raw results motivate us to discuss, and perhaps extend, via some analytical models, the so-called impulse sensitivity function model. In this paper, we try to develop quantitative predictions about the phase noise of such oscillators, and to give some new tracks on this field. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Effect of filter parameters on the phase noise of RF MEMS tunable filters employing shunt capacitive switches

A 17-GHz 130-nm CMOS VCO subsystem module in LTCC-based technology for WLAN applications

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2006
P. Mayr
Abstract This article presents a 17-GHz band VCO for system-in-a-package (SiP) solutions. A workflow for a chip-package codesign, which includes the design of LTCC-inductors, is presented. The VCO shows a phase noise of ,110 dBc/Hz at 1-MHz offset and a figure of merit (FOM) of ,190.4 dBc/Hz. Design trade-offs are given concerning phase noise, tuning range, and power consumption. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006. [source]

Adaptive coding and modulation for satellite broadband networks: From theory to practice

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, Issue 2 2010
Hermann Bischl
Abstract This paper presents the detailed design and the key system performance results of a comprehensive laboratory demonstrator for a broadband Ka-band multi-beam satellite system exploiting the new DVB-S2 standard with adaptive coding and modulation (ACM). This complete demonstrator allows in-depth verification and optimization of the ACM techniques applied to large satellite broadband networks, as well as complementing and confirming the more theoretical or simulation-based findings published so far. It is demonstrated that few ACM configurations (in terms of modulation and coding) are able to efficiently cope with a typical Ka-band multi-beam satellite system with negligible capacity loss. It is also demonstrated that the exploitation of ACM thresholds with hysteresis represents the most reliable way to adapt the physical layer configuration to the spatial and time variability of the channel conditions while avoiding too many physical layer configuration changes. Simple ACM adaptation techniques, readily implementable over large-scale networks, are shown to perform very well, fulfilling the target packet-error rate requirements even in the presence of deep fading conditions. The impact of carrier phase noise and satellite nonlinearity has also been measured. Copyright © 2009 John Wiley & Sons, Ltd. [source]

A low-phase-noise CMOS quadrature VCO with PMOS back-gate coupling

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010
Mei-Ling Yeh
Abstract A new PMOS backgate quadrature voltage controlled oscillator (QVCO) is designed and implemented using TSMC 0.18 ,m 1P6M CMOS technology. The phase noise of the PMOS back-gate coupled QVCO operating at 1.5 V is measured to be ,100 dBc/Hz and ,125.08 dBc/Hz at 100 KHz and 1 MHz offset, respectively, for a low power consumption of 15 mW. The backgate QVCO demonstrates a wide frequency tuning range, a low phase noise, and a low power consumption. The corresponding figure-of-merit of the QVCO is ,186 dBc/Hz. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2682,2685, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25564 [source]

A low voltage balanced Clapp VCO in 0.13 micromolar CMOS technology

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2010
Sheng-Lyang Jang
Abstract A balanced voltage-controlled oscillator (VCO) is designed and implemented in a 0.13 ,m CMOS 1P8M process. The designed VCO circuit topology is an all nMOS LC-tank Clapp VCO using a series-tuned resonator. At the supply voltage of 0.5 V, the output phase noise of the VCO is ,108.69 dBc/Hz at 1 MHz offset frequency from the carrier frequency of 17.72 GHz, and the figure of merit is ,186.84 dBc/Hz. The core power consumption is 4.2 mW. Tuning range is about 3.32 GHz, from 17.55 to 20.87 GHz, while the control voltage was tuned from 0 to 1.3 V. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1623,1625, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25275 [source]

Ka-band substrate integrated waveguide voltage-controlled Gunn oscillator

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010
Zhou Cao
Abstract A Ka-band substrate integrated waveguide (SIW) voltage-controlled oscillator (VCO) is demonstrated using GaAs Gunn diode.GaAs hyperabrupt varactor is employed in parallel to the Gunn diode for low phase noise and wideband tuning. The VCO achieves a tuning range of more than 1 GHz by varying the varactor tuning voltage between 0 V and 9 V, and phase noise of ,102.1 dBc/Hz at 1 MHz offset from a 36 GHz carrier frequency. The output power varies from 9.3 dBm to 11.3 dBm within the tuning range. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1232,1235, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25169 [source]

Low-voltage/low-power 7-GHZ transformer-coupled current-reused CMOS QVCO with wide tuning range

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
Yan-Ru Tseng
Abstract In this article, we report the design of a transformer-coupled current-reused quadrature voltage-controlled oscillator (QVCO) having low-voltage operation, low-power consumption, and a wide tuning range. An improved trifilar transformer that is fabricated by symmetrically interlacing two half circle secondary coils between the turns of the primary coil is proposed to provide a higher magnetic coupling factor. A QVCO integrated with such a trifilar transformer is implemented using 0.18-,m RF CMOS technology. When the QVCO is operated at a supply voltage of 1V at 7.263 GHz, the measured phase noise is ,111.4 dBc/Hz at a 1-MHz offset. Further, the QVCO core draws only 1.58 mW. The total tuning range is ,510 MHz over the whole tuning range (from 0 to 1.8 V). The calculated figure of merit is 186.6 dB and the power-frequency-tuning-normalized factor is ,9.4 dB. As compared to the reported data in a previous study, a 28.2% reduction in power consumption and a 54.5% increase in tuning range can be achieved. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:797,801, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25058 [source]

A 5-GHz low-phase noise CMOS VCO with swing boosting technique

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2009
Junhua Liu
Abstract A 5-GHz CMOS VCO with improved phase noise is proposed in this article. A gate voltage boosting technique is realized with only one inductor. The proposed VCO is fabricated in 0.18 ,m CMOS process, and the measured phase noise is ,122.7 dBc/Hz@1 MHz when operates at 4.936 GHz, with a power dissipation of 5.28 mW from 1 V supply. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2061,2064, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24539 [source]

Improved phase noise for dielectric resonators oscillators with broadband tuning

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2009
Liang Zhou
Abstract In this article, we describe a method of design of very low phase noise dielectric resonators oscillators at 13 GHz. By using two Silicon Germanium transistors with total gains 8 dB and lower flicker noise corner between 10 kHz and 40 kHz, the phase noise of the oscillators can be achieved ,125 dBc/Hz at 10 kHz offset. The resonator has unloaded Q around 14,000 at operating frequency and is then optimized and coupled to the amplifiers for minimum phase noise where QL/Q0 = 1/2 hence S21 = ,6 dB. To incorporate tuning, phase shifter is also investigated. The phase noise measurement system is also presented using two identical oscillators phase locked at the same frequency.© 2009 Wiley Pe riodicals, Inc. Microwave Opt Technol Lett 51: 1312,1316, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24334 [source]

A CMOS Colpitts voltage controlled oscillator with an enhanced transconductance method

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2008
Ching-Ian Shie
Abstract This work presents a technique to enhance the performance of the conventional PMOS Colpitts VCO circuit. This technique is accomplished by adding an NMOS cross-coupled pair under the traditional differential Colpitts VCO to enhance the oscillator startup condition. The signal analysis also supports this viewpoint and presents a device-choosing method to optimize the output power and phase noise. In realization, the circuit in the CMOS 0.18-,m technology, a U-shaped inductor, and thick oxide varactors are adopted in circuit to increase the quality factor of resonant tank. The performance of VCO demonstrates a center frequency of 16.7 GHz, a FOM of ,186.2 dBc/Hz, and the phase noise of ,110.42 dBc/Hz at the 1 MHz offset from the oscillation frequency. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3160,3164, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23944 [source]

A dual-band receiver front-end using current-mode passive mixer with digitally-controlled oscillator in 90- NM CMOS

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2008
Jinghong Chen
Abstract This work presents a receiver front-end that targets mobile video applications, and integrates a dual-band LNA, a current-mode passive mixer, a reference Gilbert mixer, and a digitally-controlled oscillator providing the quadrature LO signal for the mixers. The conversion gain and thermal noise performances of the current-mode passive mixer are studied. Design tradeoffs among noise, linearity, and conversion gain are performed. Measured performance of the receiver front-end shows a flicker noise corner of 70 kHz, a noise figure (NF) of 4.4 dB, an input third-order intermodulation product (IIP3) of ,2 dBm, and DCO phase noise of ,128 dBc/Hz at 1-MHz offset. The receiver consumes less than 24 mA of current in a 1.2-V 90-nm standard digital CMOS process. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2138,2142, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23587 [source]

A digitally controlled band-switching VCO using switching inductors and capacitors in 0.18 ,m CMOS

A varactorless CMOS direct-injection locked frequency divider

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2008
S.-L. Jang
Abstract This paper presents a new integrated direct-injection locked frequency (ILFD) with the capability of quadrature generation. The circuit consists of a quadrature VCO, based on the cross-coupling of two differential LC-tank VCOs and with the coupling transistors placed in parallel with the switch transistors, and two direct injection MOSFETs. No varactors are used, and feedback is applied for frequency tuning. The circuit is implemented using a standard 0.35 ,m CMOS process. Measurement results show that at the supply voltage of 3.3 V, the core power consumption is 27 mW. The free-running ILFD is tunable from 1.5 to 1.98 GHz and the locking range is 2.92,4.26 GHz at 0 dBm. The measured phase noise of free-running ILFD is ,118.3 dBc/Hz while the locked quadrature output phase noise is ,126.7 dBc/Hz at 1 MHz offset frequency from the oscillation frequency of 1.98 GHz, which is 8.4 dB lower than the free running ILFD. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 608,611, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23165 [source]

Low-phase noise 3 42 GHz signal generation using high-order longitudinal modes of a coaxial loop cavity

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2007
Xinyue Wang
Abstract This article demonstrates a novel coaxial loop cavity microwave/mm-wave generator. Working at high-order longitudinal modes, the generator has the single-sideband phase noise of about ,75 and ,105 dBc/Hz at 10 and 100 kHz offset over the frequency band of 3,42 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2329,2331, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22754 [source]

A 16-GHz CMOS differential Colpitts VCO for DS-UWB and 60-GHz direct-conversion receiver applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2007
C.-C. Lee
Abstract A 16-GHz CMOS differential Colpitts VCO fabricated with the 0.18 ,m 1P6M process is presented. The 16-GHz VCO is a good choice for the local oscillator (LO) circuit of the UWB or 60-GHz WPAN direct conversion receiver. The VCO is composed of a PMOS transistor-pair core circuit and two source follower output buffers. The VCO can operate at 16.5 GHz, and the measured phase noise at 1-MHz offset is ,115 dBc/Hz. The power consumption of the VCO core is 12.6 mW. Compared with previous reported works, this VCO has an output power of ,0.9 dBm and about 800-mV output peak-to-peak voltage swing of the VCO core at 16.5 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2489,2492, 2007; Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/mop.22742 [source]

Design and performance of ultra low phase noise reflection whispering gallery resonator oscillator

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2007
Nicolás A. Shtin
Abstract This article deals with the design and experimental testing of the ultra low phase noise reflection oscillator incorporating a sapphire whispering gallery resonator (WGR). On a contrast with the conventional loop configuration oscillators with transmission WGR the presented oscillator is based on a reflection WGR excited by a single probe. It is shown that a phase noise of C-band oscillator of the proposed configuration can be as low as ,136 dBc/Hz at 1-kHz Fourier frequency. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2026,2030, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22623 [source]

Quasi-constant-sensitivity VCO with offset-tuning PN junction varactor array

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2006
Sung-Huang Lee
Abstract A quasi-constant-sensitivity voltage-controlled oscillator (VCO) using an offset-tuning junction varactor array is demonstrated with low standard deviation of 4.5 MHz/V and average sensitivity of 41 MHz/V. The varactor array utilizing PN-junction varactors provides high-linear capacitor-voltage response and low sensitivity variation. The VCO has a figure-of-merit (FOM) value, FOMKvco, of 0.11 and phase noise of ,120 dBc/Hz at 1-MHz offset. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1063,1066, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21601 [source]