Results 1  10
of
110
Analysis, Design, and Optimization of Spiral Inductors and Transformers for Si RF IC's
 IEEE J. SolidState Circuits
, 1998
"... Silicon integrated circuit spiral inductors and transformers are analyzed using electromagnetic analysis. With appropriate approximations, the calculations are reduced to electrostatic and magnetostatic calculations. The important effects of substrate loss are included in the analysis. Classic circu ..."
Abstract

Cited by 66 (3 self)
 Add to MetaCart
(Show Context)
Silicon integrated circuit spiral inductors and transformers are analyzed using electromagnetic analysis. With appropriate approximations, the calculations are reduced to electrostatic and magnetostatic calculations. The important effects of substrate loss are included in the analysis. Classic circuit analysis and network analysis techniques are used to derive twoport parameters from the circuits. From twoport measurements, loworder, frequencyindependent lumped circuits are used to model the physical behavior over a broadfrequency range. The analysis is applied to traditional square and polygon inductors and transformer structures as well as to multilayer metal structures and coupled inductors. A custom computeraideddesign tool called ASITIC is described, which is used for the analysis, design, and optimization of these structures. Measurements taken over a frequency range from 100 MHz to 5 GHz show good agreement with theory.
Optimization of inductor circuits via geometric programming
, 1999
"... We present an efficient method for optimal design and synthesis of CMOS inductors for use in RF circuits. This method uses the the physical dimensions of the inductor as the design parameters and handles a variety of specifications including fixed value of inductance, minimum selfresonant frequency ..."
Abstract

Cited by 31 (17 self)
 Add to MetaCart
(Show Context)
We present an efficient method for optimal design and synthesis of CMOS inductors for use in RF circuits. This method uses the the physical dimensions of the inductor as the design parameters and handles a variety of specifications including fixed value of inductance, minimum selfresonant frequency, minimum quality factor, etc. Geometric constraints that can be handled include maximum and minimum values for every design parameter and a limit on total area. Our method is based on formulating the design problem as a special type of optimization problem called geometric programming, for which powerful efficient interiorpoint methods have recently been developed. This allows us to solve the inductor synthesis problem globally and extremely efficiently. Also,we can rapidly compute globally optimal tradeoff curves between competing objectives such as quality factor and total inductor area. We have fabricated a number of inductors designed by the method, and found good agreement between the experimental data and the specifications predicted by our method. 1
Superharmonic InjectionLocked Frequency Dividers
 IEEE J. SolidState Circuits
, 1999
"... ..."
(Show Context)
FrequencySelective MEMS for Miniaturized LowPower Communication Devices
, 1999
"... With Q’s in the tens to hundreds of thousands, micromachined vibrating resonators are proposed as integratedcircuitcompatible tanks for use in the low phasenoise oscillators and highly selective filters of communications subsystems. To date, LF oscillators have been fully integrated using merged C ..."
Abstract

Cited by 24 (9 self)
 Add to MetaCart
With Q’s in the tens to hundreds of thousands, micromachined vibrating resonators are proposed as integratedcircuitcompatible tanks for use in the low phasenoise oscillators and highly selective filters of communications subsystems. To date, LF oscillators have been fully integrated using merged CMOS/microstructure technologies, and bandpass filters consisting of springcoupled micromechanical resonators have been demonstrated in a frequency range from HF to VHF. In particular, tworesonator micromechanical bandpass filters have been demonstrated with frequencies up to 35 MHz, percent bandwidths on the order of 0.2%, and insertion losses less than 2 dB. Higher order threeresonator filters with frequencies near 455 kHz have also been achieved, with equally impressive insertion losses for 0.09 % bandwidths, and with more than 64 dB of passband rejection. Additionally, freefreebeam singlepole resonators have recently been realized with frequencies up to 92 MHz and ’s around 8000. Evidence suggests that the ultimate frequency range of this high tank technology depends upon material limitations, as well as design constraints, in particular, to the degree of electromechanical coupling achievable in microscale resonators.
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
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.
Bandwidth extension in CMOS with optimized onchip inductors
 IEEE J SolidState Circuits
"... ..."
(Show Context)
Overcoming untuned radios in wireless networks with network coding
 IEEE TRANSACTIONS ON INFORMATION THEORY
, 2006
"... The drive toward the implementation and massive deployment of wireless sensor networks calls for ultralowcost and lowpower nodes. While the digital subsystems of the nodes are still riding Moore's Law, there is no such trend regarding the performance of analog components. This work presents ..."
Abstract

Cited by 16 (1 self)
 Add to MetaCart
The drive toward the implementation and massive deployment of wireless sensor networks calls for ultralowcost and lowpower nodes. While the digital subsystems of the nodes are still riding Moore's Law, there is no such trend regarding the performance of analog components. This work presents a fully integrated architecture of both digital and analog components (including local oscillator) that offers significant reduction in cost, size and power consumption of the overall node. While such a radical architecture cannot offer the reliable tuning of standard designs, it is shown that by using random network coding, a dense network of such nodes can achieve throughput linear in the number of channels available for communication. Moreover, the ratio of the achievable throughput of the untuned network to the throughput of a tuned network with perfect coordination is shown to be close to 1/ e. This work makes use of known results from network coding theory that show that throughput equal to the maxflow in a graph is achievable. However, the challenge here is finding the maxflow of the random graph corresponding to the network.
A 5GHz CMOS Wireless LAN Receiver Front End
 IEEE Journal of SolidState Circuits
, 2000
"... ..."
(Show Context)
A CMOS Frequency Synthesizer with an InjectionLocked Frequency Divider
 IEEE J. SolidState Circuits
, 2000
"... ..."