Results 251 to 260 of about 224,725 (310)

RC Passive Notch Filters

IETE Journal of Research, 1976
A critical study of various types of passive notch filters is made. The distributed parameter notch filters are found to be superior in performance as compared to the lumped RC and lumped-distributed types. The frequency response curves indicate that tapering in distributed notch filters improves the notch selectivity.
M. J. R. Khan, null Jalaluddin, K. U. Ahmad   +2 more
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Passive CCD resonator filters

IEEE Journal of Solid-State Circuits, 1981
Novel passive recursive CCD bandpass filters have been realized using standard two-level-polysilicon gate NMOS technology. A Chebyshev bandpass (w/SUB rel,/ /SUB 3/ /SUB dB/=3.1 percent) and a fully integrated CCD signal filter with an extremely narrow 3 dB bandwidth of 97 Hz (Q=1350) at 131.85 kHz center frequency were implemented by means of cascaded
R. Schreiber, M. Feil, H. Betzl, A. Bardl, K. Traub   +4 more
openaire   +1 more source

Multi-output passive digital filters

2004 IEEE Electro/Information Technology Conference, 2004
In this paper, a new family of four multi-output second-order passive digital filters constructed from four passive digital two-ports are presented. The conditions for passivity in a passive digital two-port are first defined. Four passive two-ports are introduced, their passivity and stability constraints on coefficients, and pseudopower expressions ...
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Passive waveguide filters on InP

Frontiers in Optics, 2003
Passive IIR filters in InGaAsP/InP waveguides were realized using ring resonators and photonic crystal cavities. The filter response of the fabricated devices was characterized by transmission and group delay measurements. Dispersion larger than 100 ps/nm was achieved with a ring resonator having a free spectral range of 100 GHz.
J. Zimmermann, M. Kamp, A. Forchel, B. K. Saravanan, R. März   +4 more
openaire   +1 more source

Nonlinear passive acoustic filtering

The Journal of the Acoustical Society of America, 1988
in an ear muff intended for protection against excessive noise exposure, the passive means (8) according to this invention automatically and continuously varies the amount of reduction provided for the sound arriving at the ear of the wearer; it retains substantially unaltered the performance of the ear muff for high sound levels, but effects a ...
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Matrix filters for passive sonar

2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002
This paper introduces matrix filters as a tool for localization and detection problems in passive sonar. The outputs of an array of sensors, at some given frequency, can be represented by a vector of complex numbers. A linear filtering operation on the sensor outputs can be expressed as the multiplication of a matrix (called a matrix filter) times this
Vaccaro, Richard J., Harrison, Brian F.
openaire   +2 more sources

Research on Active Filters and Passive Filters

Science and Technology of Engineering, Chemistry and Environmental Protection
Active filters have been a cornerstone of electronic engineering since their inception in the mid-20th century. As technology has advanced, these components have become increasingly sophisticated and integral to a wide range of applications, from audio equipment to telecommunications. This article introduces two types of active filters, active low-pass
Haoyu Wang, Haoran Zhang
openaire   +1 more source

Passive Harmonic Filter Design Scheme

IEEE Industry Applications Magazine, 2011
In this article, a passive harmonic filter design scheme is proposed for offshore power distribution systems with subsea cables. Such an offshore system requires more reliable harmonic filters due to parallel resonance and the resultant large harmonic distortions in the system caused by subsea cables.
null Xiaodong Liang, O. Ilochonwu
openaire   +1 more source

Passive Filter Circuit Design

1991
It would be misleading to suggest, with the advent of operational amplifiers and digital synthesis techniques, that passive filters have no role to perform in modern circuit applications.
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Passive Integrated RF Filters

1999
The practical application of RF integration in the front end of cellular telephones is discussed. The varying requirements of an integration technology are identified based on generic system architectures and examples of commercially available integrated components are given.
openaire   +1 more source