Results 1  10
of
154
A general theory of phase noise in electrical oscillators
 IEEE J. SolidState Circuits
, 1998
"... Abstract — A general model is introduced which is capable of making accurate, quantitative predictions about the phase noise of different types of electrical oscillators by acknowledging the true periodically timevarying nature of all oscillators. This new approach also elucidates several previousl ..."
Abstract

Cited by 163 (15 self)
 Add to MetaCart
(Show Context)
Abstract — A general model is introduced which is capable of making accurate, quantitative predictions about the phase noise of different types of electrical oscillators by acknowledging the true periodically timevarying nature of all oscillators. This new approach also elucidates several previously unknown design criteria for reducing closein phase noise by identifying the mechanisms by which intrinsic device noise and external noise sources contribute to the total phase noise. In particular, it explains the details of how 1=f noise in a device upconverts into closein phase noise and identifies methods to suppress this upconversion. The theory also naturally accommodates cyclostationary noise sources, leading to additional important design insights. The model reduces to previously available phase noise models as special cases. Excellent agreement among theory, simulations, and measurements is observed. Index Terms—Jitter, oscillator noise, oscillators, oscillator stability, phase jitter, phase locked loops, phase noise, voltage controlled oscillators. I.
Phase Noise in Oscillators: a Unifying Theory and Numerical Methods for Characterization
 IEEE Transactions on Circuits and Systems
, 2000
"... Abstract—Phase noise is a topic of theoretical and practical interest in electronic circuits, as well as in other fields, such as optics. Although progress has been made in understanding the phenomenon, there still remain significant gaps, both in its fundamental theory and in numerical techniques f ..."
Abstract

Cited by 147 (20 self)
 Add to MetaCart
(Show Context)
Abstract—Phase noise is a topic of theoretical and practical interest in electronic circuits, as well as in other fields, such as optics. Although progress has been made in understanding the phenomenon, there still remain significant gaps, both in its fundamental theory and in numerical techniques for its characterization. In this paper, we develop a solid foundation for phase noise that is valid for any oscillator, regardless of operating mechanism. We establish novel results about the dynamics of stable nonlinear oscillators in the presence of perturbations, both deterministic and random. We obtain an exact nonlinear equation for phase error, which we solve without approximations for random perturbations. This leads us to a precise characterization of timing jitter and spectral dispersion, for computing which we develop efficient numerical methods. We demonstrate our techniques on a variety of practical electrical oscillators and obtain good matches with measurements, even at frequencies close to the carrier, where previous techniques break down. Our methods are more than three orders of magnitude faster than the bruteforce Monte Carlo approach, which is the only previously available technique that can predict phase noise correctly. Index Terms—Circuit simulation, FokkerPlanck equations, nonlinear oscillators, oscillator noise, phase noise, stochastic
DirectConversion Radio Transceivers for Digital Communications
 IEEE Journal of SolidState Circuits
, 1995
"... AbstractDirectconversion is an alternative wireless receiver architecture to the wellestablished superheterodyne, particularly for highly integrated, lowpower terminals. Its fundamental advantage is that the received signal is amplified and filtered at baseband rather than at some high intermed ..."
Abstract

Cited by 111 (2 self)
 Add to MetaCart
AbstractDirectconversion is an alternative wireless receiver architecture to the wellestablished superheterodyne, particularly for highly integrated, lowpower terminals. Its fundamental advantage is that the received signal is amplified and filtered at baseband rather than at some high intermediate frequency. This means lower current drain in the amplifiers and active filters and a simpler task of imagerejection. There is considerable interest to use it in digital cellular telephones and miniature radio messaging systems. This paper briefly covers case studies in the use of directconversion receivers and transmitters and summarizes some of the key problems in their implementations. Solutions to these problems arise not only from more appropriate circuit design but also from exploiting system characteristics, such as the modulation format in the system. Baseband digital signal processing must be coupled to the analog frontend to make directconversion transceivers a practical reality. I.
A study of phase noise in CMOS oscillators
 IEEE Journal of SolidState Circuits
, 1996
"... ..."
(Show Context)
Jitter in ring oscillators
 IEEE Journal of SolidState Circuits
, 1997
"... Abstract — Jitter in ring oscillators is theoretically described, and predictions are experimentally verified. A design procedure is developed in the context of time domain measures of oscillator jitter in a phaselocked loop (PLL). A major contribution is the identification of a design figure of me ..."
Abstract

Cited by 54 (1 self)
 Add to MetaCart
(Show Context)
Abstract — Jitter in ring oscillators is theoretically described, and predictions are experimentally verified. A design procedure is developed in the context of time domain measures of oscillator jitter in a phaselocked loop (PLL). A major contribution is the identification of a design figure of merit , which is independent of the number of stages in the ring. This figure of merit is used to relate fundamental circuitlevel noise sources (such as thermal and shot noise) to systemlevel jitter performance. The procedure is applied to a ring oscillator composed of bipolar differential pair delay stages. The theoretical predictions are tested on 155 and 622 MHz clockrecovery PLL’s which have been fabricated in a dielectrically isolated, complementary bipolar process. The measured closedloop jitter is within 10 % of the design procedure prediction. Index Terms—Design methodology, jitter, noise measurement, oscillator noise, oscillator stability, phase jitter, phaselocked loops, phase noise, voltage controlled oscillators. I.
Hajimiri A. Oscillator Phase Noise: a Tutorial
 IEEE Journal of SolidState Circuits
, 2000
"... ..."
(Show Context)
Technology for Timing and Frequency Control
 IEEE Int. Frequency Control/Precision Time & Time Interval Symposium, Aug 2005
"... Abstract—An overview on the use of microelectromechanical systems (MEMS) technologies for timing and frequency control is presented. In particular, micromechanical RF filters and reference oscillators based on recently demonstrated vibrating onchip micromechanical resonators with Q’s>10,000 at 1 ..."
Abstract

Cited by 24 (2 self)
 Add to MetaCart
(Show Context)
Abstract—An overview on the use of microelectromechanical systems (MEMS) technologies for timing and frequency control is presented. In particular, micromechanical RF filters and reference oscillators based on recently demonstrated vibrating onchip micromechanical resonators with Q’s>10,000 at 1.5 GHz, are described as an attractive solution to the increasing count of RF components (e.g., filters) expected to be needed by future multiband wireless devices. With Q’s this high in onchip abundance, such devices might also enable a paradigmshift in the design of timing and frequency control functions, where the advantages of highQ are emphasized, rather than suppressed (e.g., due to size and cost reasons), resulting in enhanced robustness and power savings. With even more aggressive threedimensional MEMS technologies, even higher onchip Q’s have been achieved via chipscale atomic physics packages, which so far have achieved Q’s>10 7 using atomic cells measuring only 10 mm 3 in volume, consuming just 5 mW of power, all while still allowing Allan deviations down to 1011 at one hour. Keywords—MEMS, micromechanical, quality factor, resonator, oscillator, filter, wireless communications, mechanical circuit, chipscale atomic clock, physics package. I.
Integrated Circuit Technology Options for RFIC’sPresent Status and Future Directions
 IEEE Journal of SolidState Circuits
, 1998
"... Abstract—This paper will summarize the technology tradeoffs that are involved in the implementation of radio frequency integrated circuits for wireless communications. Radio transceiver circuits have a very broad range of requirements—including noise figure, linearity, gain, phase noise, and power d ..."
Abstract

Cited by 15 (0 self)
 Add to MetaCart
(Show Context)
Abstract—This paper will summarize the technology tradeoffs that are involved in the implementation of radio frequency integrated circuits for wireless communications. Radio transceiver circuits have a very broad range of requirements—including noise figure, linearity, gain, phase noise, and power dissipation. The advantages and disadvantages of each of the competing technologies—Si CMOS and bipolar junction transistors (BJT’s), Si/SiGe HBT’s and GaAs MESFET’s, PHEMTS and HBT’s will be examined in light of these requirements. Index Terms—CMOS RF, lownoise amplifiers, monolithic radio architectures, radio receivers, wireless communications. I.
Transceiver FrontEnd Architectures Using Vibrating Micromechanical Signal Processors
, 2001
"... Transceiver architectures are proposed that best harness the tiny size, zero dc power dissipation, and ultrahighQ of vibrating micromechanical resonator circuits. Among the more aggressive architectures proposed are one based on a micromechanical RF channelselector and one featuring an allMEMS R ..."
Abstract

Cited by 15 (9 self)
 Add to MetaCart
Transceiver architectures are proposed that best harness the tiny size, zero dc power dissipation, and ultrahighQ of vibrating micromechanical resonator circuits. Among the more aggressive architectures proposed are one based on a micromechanical RF channelselector and one featuring an allMEMS RF frontend. These architectures maximize performance gains by using highly selective, lowloss micromechanical circuits on a massive scale, taking full advantage of Q versus power tradeoffs. Micromechanical filters, mixerfilters, and switchable synthesizers are identified as key blocks capable of substantial power savings when used in the aforementioned architectures. As a result of this architectural exercise, more focused directions for further research and development in RF MEMS are identified.
Virtual damping and Einstein relation in oscillators
 IEEE Journal of Solid State Circuits
, 2003
"... ..."
(Show Context)