IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications
1558-1268
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Variable gain amplifiers based on a new approximation method to realize the exponential function
Tập 49 Số 9 - Trang 1348-1354 - 2002
A new current mode variable-gain amplifier (VGA) is developed. The new circuit is based on a novel approximation function that is very close to the ideal exponential relation over a very wide range. Pspice simulations are provided based on Mietec 0.5-/spl mu/m CMOS technology. The simulations show that the dynamic range achieved is over 50 dB in a single stage. The proposed circuit consumes averag......
#Approximation methods #Dynamic range #CMOS technology #Circuit simulation #Difference equations #Voltage #Gain control #Auditory system #Communication system control #Bipolar transistors
A loop-breaking method for the analysis and simulation of feedback amplifiers
Tập 49 Số 8 - Trang 1045-1061 - 2002
Two-circuit models for feedback subcircuits are developed from a modification to the two-port method of feedback amplifier analysis and are applied in a method to break the feedback loop. These models are terminally equivalent to linear and nonlinear subcircuits, have physically-disconnected topologies, and employ dependent sources to control lateral signal transfer with a switch-like on or off ma......
#Analytical models #Feedback amplifiers #Feedback loop #Operational amplifiers #SPICE #Integrated circuit interconnections #Circuit simulation #Voltage #Circuit topology #Equivalent circuits
Synchronizability of distributed clock oscillators
Tập 49 Số 9 - Trang 1271-1278 - 2002
We analyze the synchronizability of synchronous distributed oscillators (SDOs), a novel clocking scheme for microprocessors. A computer-aided perturbation analysis is developed for such systems, where analytically tractable equations of the clock phases are reduced from experimental data reflecting all circuit details. Using this reduction, a theory is constructed to explain the underlying mechani......
#Clocks #Frequency synchronization #Circuits #Equations #Voltage-controlled oscillators #Jitter #Delay #Distributed computing #Large scale integration #Threshold voltage
The effects of generation redispatch on Hopf bifurcations in electric power systems
Tập 49 Số 8 - Trang 1180-1186 - 2002
In this paper, we examine how varying the generation redispatch can improve the system stability margins with respect to Hopf bifurcations, as well as robustness to uncertainties in load modeling and distribution. It is seen that an optimal selection of load following units plays a key role in accomplishing these objectives. An optimal redispatch strategy is proposed, and is verified through a var......
#Power generation #Bifurcation #Power system modeling #Voltage #Load modeling #Eigenvalues and eigenfunctions #Robust stability #Power system stability #Differential equations #Power system dynamics
A self-tuning fuzzy filtered-U algorithm for the application of active noise cancellation
Tập 49 Số 9 - Trang 1325-1333 - 2002
This paper presents a fuzzy filtered-U algorithm for an active noise control (ANC) system. Instead of complex designing procedures, the proposed approach uses few mathematical transfer functions to design the ANC system. A fuzzy-based self-tuning algorithm is also provided in this paper to adjust the free parameters of the fuzzy filtered-U algorithm. In addition, the proposed method protects ANC s......
#Noise cancellation #Acoustic noise #IIR filters #Frequency #Adaptive filters #Fuzzy control #Active noise reduction #Signal generators #Fuzzy systems #Control systems
A minimal integral nonlinearity criterion to optimize the design of a new tanh/sinh-type bipolar transconductor
Tập 49 Số 8 - Trang 1062-1070 - 2002
We report on the use of a simple design optimization criterion for obtaining maximum static transfer function linearity. It is based on an analytic function that corresponds to the integral nonlinearity of the circuit. The criterion may be useful, either as an analytic tool to gain insight into the circuit's behavior, or as an efficient computational alternative to calculating total harmonic disto......
#Design optimization #Transconductors #Linearity #Transfer functions #Harmonic analysis #Circuit analysis computing #Total harmonic distortion #Circuit simulation #Transconductance #Voltage
Computation of limit cycle via higher order harmonic balance approximation and its application to a 3-bus power system
Tập 49 Số 9 - Trang 1360-1370 - 2002
This work reviews and elaborates a frequency domain approximate method of estimating amplitude, frequency, and stability of the limit cycle near Hopf bifurcations. A new iterative method and new criterion for ascertaining stability are presented. The method and criterion are applied to a 3-bus dynamic power system model to give the amplitude, frequency and stability at its Hopf bifurcations. New a......
#Power system harmonics #Limit-cycles #Power system stability #Bifurcation #Power system modeling #Power system dynamics #Frequency estimation #Stability criteria #Frequency domain analysis #Amplitude estimation
Optimal digital redesign of hybrid cascaded input-delay systems under state and control constraints
Tập 49 Số 9 - Trang 1382-1392 - 2002
This paper presents a new multi-objective evolutionary programming (MOEP)-based digital redesign scheme to find an optimal low-gain digital tracking controller for hybrid control of multi-input, multi-output (MIMO) cascaded analog systems with input time delays, having the constraints on the states and inputs. The proposed global optimization searching technique enables one to find a high-gain opt......
#Optimal control #Control systems #Digital control #MIMO #Delay effects #Pulse modulation #Genetic programming #Constraint optimization #Sampling methods #Amplitude modulation
Design and simulation of a single-electron random-access memory array
Tập 49 Số 9 - Trang 1370-1375 - 2002
A single-electron random-access memory array is designed and its operation is analyzed using Monte Carlo simulation. This memory array utilizes a basic single-electron memory cell that has been recently fabricated. Bits of information are represented by the presence or absence of a single or a small number of electrons at conducting islands. Simulation shows that selective read and write operation......
#Single electron memory #Circuit simulation #Electron traps #Computational modeling #Computer simulation #Application software #CMOS technology #Read-write memory #Power dissipation #Inverters
Global stability of a class of continuous-time recurrent neural networks
Tập 49 Số 9 - Trang 1334-1347 - 2002
This paper investigates global asymptotic stability (GAS) and global exponential stability (GES) of a class of continuous-time recurrent neural networks. First, we introduce a necessary and sufficient condition for the existence and uniqueness of equilibrium of the neural networks with Lipschitz continuous activation functions. Next, we present two sufficient conditions to ascertain the GAS of the......
#Recurrent neural networks #Asymptotic stability #Neural networks #Sufficient conditions #Convergence #Vectors #Quadratic programming #Constraint optimization #Councils #Automation