ICCSC'02. 1st IEEE International Conference on Circuits and Systems for Communications. Proceedings (IEEE Cat. No.02EX605)
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Quantization effects in the first-order digital recursive filters with round-off
- Trang 126-129
Processes in filters of low and high frequencies with arbitrary-level quantization with rounding of summarizing results are investigated. Oscillations with constant external action are analyzed with help of method of point representation. Probability diagrams describe behavior of system. Expressions for calculation of most probable modes are obtained.
#Quantization #Digital filters #Frequency #Bifurcation #Probability #Nonlinear filters #Signal sampling #Stochastic processes #Signal processing #White noise
Radiation induced current in coaxial cables
- Trang 412-415
On the basis of the analysis of charge reallocation processes in a coaxial cable stimulated by the activity of gamma-X-rays (GXR), a model of an equivalent current generator is designed. Expressions are obtained for separate components of a current and the calculation of a coefficient of radiation susceptibility of a cable is conducted, depending on energy-angular inhomogeneity acting GXR, constru......
#Coaxial cables #Instruments #Satellite broadcasting #X-rays #Design methodology #Military satellites #Semiconductor devices #Electromagnetic radiation #Circuits #Conductors
Quantization of wavelet coefficients
- Trang 202-205
The wavelet coefficients quantization model is suggested in this paper. Quantization is represented as addition of noise by equal parts in all bands of the wavelet transform. The linear approximation model of dependence of quantizing distortion power from a quantizing interval is considered. It is shown that use of the pointed model allows increased efficiency of picture coding.
#Quantization #Wavelet coefficients #Frequency #PSNR #Image coding #Wavelet transforms #Interpolation #Discrete transforms #Hydrogen #Low-frequency noise
Law of conservation of energy in modern communication circuits
- Trang 36-37
Tellegen obtained the most universal of the known proofs of a conservation law of energy in electrical circuits. However it assumed that the circuits were a connection of two-terminal 2-T networks. But almost always there are multi-terminal components in modern communication circuits. Here we consider the most general proof of a conservation law of energy in electrical circuits in which multi-term......
#Equations #Modems #Informatics #Electronic mail #Communication equipment #Circuit theory #Kirchhoff's Law #Voltage
CAD of RF and microwave filters for wireless communications
- Trang 308-311
This paper presents the CAD of RF and microwave filters such as lumped element, combline and waveguide bandpass filters for wireless communication systems. A new high-Q periodic resonator has been used for combline filter applications. A significantly higher Q factor than that for a conventional combline resonator in the same volume has been achieved.
#Radio frequency #Microwave filters #Wireless communication #Resonator filters #Band pass filters #Insertion loss #Low pass filters #Chebyshev approximation #Q factor #Propagation losses
A CMOS OTA-C channel-select filter for mobile receiver
- Trang 50-53
A low-power fifth-order 100 kHz CMOS Gm-C filter intended for baseband mobile communication is presented. The operational transconductance amplifier (OTA) used in this filter has a measured input linear range up to 2 Vpp. The filter fabricated in 1.5 /spl mu/m CMOS technology dissipates 600 /spl mu/W from a single 3.3 V supply.
#Filters #Voltage #Transconductance #Baseband #Operational amplifiers #CMOS analog integrated circuits #CMOS technology #GSM #Feedback loop #Informatics
On pattern formation in a class of cellular neural networks
- Trang 258-262
The dynamics of a class of cellular neural networks (CNNs) related to pattern formation is investigated in the central linear part using the decoupling technique based on discrete spatial Fourier transform. The influence of the cell order and template neighborhood is discussed as well.
#Pattern formation #Intelligent networks #Cellular neural networks #Eigenvalues and eigenfunctions #Admittance #Differential equations #Stability #Electronic mail #Fourier transforms #Coupling circuits
VLSI design of CMOS image-reject LNA for 950-MHz wireless receivers
- Trang 330-333
This paper presents the design of a CMOS integrated image reject low noise amplifier (IR-LNA) for application to 950 MHz low power, low voltage wireless receivers. A second-order active band-pass filter using an integrated inductor is incorporated into the LNA core to reject the 1.6 GHz image signal without achieving high Q values. The circuit proves to be suitable for highly integrated CMOS recei......
#Very large scale integration #CMOS technology #Low-noise amplifiers #Low voltage #Band pass filters #Active inductors #Wideband #Integrated circuit technology #Gain #Noise figure
Simulation of second order comb filter based on delta modulation
- Trang 86-87
In this paper, a simulation technique is presented to confirm the operation of a suggested structure for the second order comb filter which is used for different applications, such as telecommunications, control systems, bioelectronics, etc. Two types of structure are investigated from mathematical analysis which describes their operation in the time and frequency domains. The suggested structure ......
#Filters #Delta modulation #Application software #Control system synthesis #Telecommunication control #Mathematical analysis #Frequency domain analysis #Computational modeling #Computer simulation #Telecommunication computing
A low-voltage fully-differential BiCMOS op amp for polyphase filter
- Trang 46-49
This article presents a low-voltage fully-differential operational amplifier for a polyphase filter for mobile communication receivers. Due to a high gain-bandwidth 200 MHz and a low noise 6.7 nV//spl radic/(Hz) of the amplifier the filter spurious free dynamic range SFDR is 95 dB and a noise floor at the output is 15 /spl mu/V/sub rms/. The 5th order polyphase (10th order band pass) filter fabric......
#BiCMOS integrated circuits #Operational amplifiers #Band pass filters #Voltage #Dynamic range #Mirrors #Frequency #Bandwidth #Differential amplifiers #Resistors