
	Where results make sense

Topic: Filter topology

Related Topics

electronic filter

low pass filter

digital filter

high pass filter

filter mathematics

pipes and filters

band pass filters

filter coffee

filter feeders

filter optics

Filter signal processing

Anti aliasing filter

In the News (Sat 19 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	PlanetMath: limit along a filter
		This notions shouldn't be confused with the notion of limit of a filter defined in general topology.
		Limit along the Fréchet filter, which consist of complements of finite sets, is the usual limit of a sequence.
		This is version 2 of limit along a filter, born on 2005-10-11, modified 2005-10-11.
	planetmath.org /encyclopedia/LimitAlongAFilter2.html (310 words)

	Filter (mathematics) : Filter (topology)
		Filters are useful in topology: they play the role of sequences in metric spaces.
		A filter which is a superset of the neighbourhood filter of x is said to converge to x.
		That interpretation of membership in a filter is used (for motivation, although it isn't needed for actual proofs) in the theory of ultraproducts[?] in model theory, a branch of mathematical logic.
	www.fastload.org /fi/Filter_(topology).html (338 words)

	Applied Dynamic Measurements - Filter (Site not responding. Last check: 2007-09-17)
		Choosing the most appropriate filter response relates to the desired flatness in the passband, attenuation and damping in the transition band, and linearity of phase characteristic in the stopband.
		The final filter design is a matter of extracting the polynomial coefficients from the equation that provides the optimum pole/zero placement and using these coefficients to synthesise the component values for the desired filter topology.
		This filter tutorial is not intended as an in depth discussion but instead forms a brief outline of basic filter principles and provides some awareness of points to be understood and considered in the design and selection of electronic filters.
	www.admnetworks.com /filters.htm (1206 words)

	What is a Twin T Filter? (Site not responding. Last check: 2007-09-17)
		A Twin T Filter is a two pole filter topology.
		Twin T filters are available in low pass, high pass, bandpass, and notch versions.
		For low pass and high pass filters, it is easy to change the filter type (Butterworth, Chebyshev, and Bessel).
	www-k.ext.ti.com /SRVS/Data/ti/KnowledgeBases/analog/document/faqs/tt.htm (193 words)

	Passive Differential IF Filters for the MAX2360/61 Transmitter ICs - Maxim/Dallas
		Filter textbooks are replete with example after example of single ended filters, and balanced filter implementation is left to the engineer's imagination.
		is the 3dB bandwidth of the filter, in Hz.
		All that remains is to translate the "ground" of the filter in such a manner as to allow the two signal paths to become symmetrical with respect to ground.
	www.maxim-ic.com /appnotes.cfm?an_pk=791 (1593 words)

	Lorch Specification Guide
		Filters may be designed with asymmetrical responses to most efficiently attenuate low side or high side signals.
		The lowpass filter response extends from D.C. to a specified cutoff frequency.
		Unlike the Elliptic filter where the finite attenuation poles are determined by the mathematical function, the Pole Placed filter allows the designer to specify where these points fall.
	www.lorch.com /specifications.html (743 words)

	Active Filters (Site not responding. Last check: 2007-09-17)
		The two outputs from the LR2 crossover filter are 180 degrees out of phase at all frequencies, which requires to use one of the drivers with reversed polarity, so that the two acoustic outputs add in phase.
		The acoustic frequency and polar response is controlled by the electrical filters and the response of the mounted drivers.
		The steep filter slopes make the combined acoustic response less sensitive to magnitude errors in the driver responses, but phase shift errors usually have to be corrected with an additional allpass network.
	www.linkwitzlab.com /filters.htm (2352 words)

	Filter
		The Q is the resonance magnification of the filter and it is recognized by the shape of the "knee" of the
		Filters with a high Q tend to "ring" and exhibit poor transient response.
		4th-order Legendre: (A seldom used filter that is constructed with an asymmetrical filter topology.) Produces a -1 dB crossover point that sums to a +5 dB amplitude response with minor ripple.
	members.cox.net /kgunz/filters_crossovers.htm (1562 words)

	Sean Browne - 2001 GMUE Thesis
		This filter topology is known as an “inverse comb filter” because the notches in the frequency response resemble the teeth of an upside down comb.
		This filter, as well as parallel and cascade combinations, has a finite length impulse response and can be guaranteed to be stable regardless of the magnitude of “a.” However, room impulse responses consist of very dense series of echoes that cannot be practically realized using this architecture.
		This filter topology is known as a “comb filter” because the peaks in the frequency response resemble the teeth of an upright comb (Figure 2.17).
	www.music.miami.edu /programs/mue/research/sbrowne/chap2.html (5042 words)

	combline filter design
		Filters that can be designed in this frequency range are lumped element filter, SAW filter, helical filter, interdigital filters and combline filters.
		Another property of this filter is that, in theory, the attenuation through the filter will be infinite at the frequency for which the resonator lines are λo/4 long.
		One of the primary concerns was to accommodate this filter in a 1×1" substrate, so the filter schematic was manually reorganized to fit in the specified substrate size.
	rfdesign.com /mag/radio_combline_filter_design (1150 words)

	Larry Osterman's WebLog : What's in your audio card?
		Essentially the topology of the audio adapter describes a complex path from a source pin to a destination pin (which usually corresponds to an external audio jack on the adapter).
		There are four "pin factories" on the wave filter - 0 is the render filter, 1 is the capture filter, two is the data output and three is the data input (ignore the direction of the arrows, it doesn't reflect the actual data flow).
		The topology filter has 10 different inputs, corresponding to wave out, cd audio, aux, etc - the left hand column is essentially the list of source lines on the mixer topology.
	blogs.msdn.com /larryosterman/archive/2005/06/13/428724.aspx (936 words)

	Bandpass Filters (Site not responding. Last check: 2007-09-17)
		This filter topology requires that both ports be terminated in 50 ohms in order to achieve the designed bandpass response and it's associated stop band attenuation.
		Below the main filter is an equivalent filter using transformers to match the filter to a 50 ohm load.
		R term represents the input and output impedance of the filter and impedance matching is usually performed with transformers and/or resistors.
	www.qrp.pops.net /bandpass.htm (1184 words)

	[No title]
		An understanding of the novel Euglena chloroplast protein import process requires knowledge of the topology of the precursors within the membrane of the transport vesicle that fuses with the outermost of the three chloroplast envelope membranes.
		Vesicle membrane protein topology is determined by decoding of topogenic sequences during protein translocation into the ER (15, 16).
		Additionally, measures of body composition and body topology are related to undesirable metabolic characteristics that are known risk factors for chronic diseases, such as glucose intolerance, hyperinsulinemia, elevated triglycerides and low HDL cholesterol concentrations (Jensen 1997, Kissebah and Krakower 1994).
	www.lycos.com /info/topology--miscellaneous.html?page=2 (543 words)

	KYBSIM
		Filters are used to attenuate (ideally: remove) certain frequency commponents of a signal.
		For example, lowpass filters are used to attenuate high frequent noise in a measurement signal.
		Initially, you can use the default choices for filter topology, which is Butterworth, and the default choice of filter order.
	www.techteach.no /kybsim/filters/index.php (488 words)

	Virtual Instrumentation Empowers Digital Signal Processing Design- Developer Zone - National Instruments
		The filter order is important during filter design because it is an indicator of the number of calculations in the final implementation.
		The block diagram of the example VI shows the filter design, the control over the filter topology and integer word lengths, the simulation of the fixed- and floating-point designs to uniform white noise, and the analysis of the simulation.
		The fixed-point filter clearly does not give the same simulation results as the floating-point simulation, despite the fact that the magnitude, phase, and pole-zero plots of the designed filters are nearly identical.
	zone.ni.com /devzone/cda/tut/p/id/4759 (2164 words)

	Minimizing Component-Variation Sensitivity in Single Op Amp Filters - Maxim/Dallas
		Single-op-amp filters often exhibit great sensitivity to variations in their passive-component values, and filters with high Qs (i.e., most higher-order filters) are particularly sensitive.
		High-order filters often require at least one stage with a very high Q. This stage can be implemented with a more complicated topology, whereas the other stages are implemented with low-sensitivity Sallen-Key circuits.
		The spread in frequency response for the high-pass filter is tighter than that of the low-pass filter, particularly around the peak.
	www.maxim-ic.com /appnotes.cfm/appnote_number/738 (2906 words)

	EDN Access -- 03.02.95 Notch filter is dc accurate (Site not responding. Last check: 2007-09-17)
		However, a filter topology that separates the dc and ac paths can eliminate the last two of these unwanted behaviors (Fig 1a).
		The result is an active circuit that emulates the passive filter of Fig 1b.
		The overall filter determines the peak voltage across the synthesized inductor at pin 13 of IC Therefore, you adjust the peak value at IC 's pin 13 to match that of IC by varying the gms.
	www.edn.com /archives/1995/030295/05di1.htm (428 words)

	analog input in digital 317 Part 3
		One filter that by necessity is an analog filter is an anti-aliasing filter.
		Filtering merely means altering the frequency content of a signal - the low pass, high pass, bandpass, notch and bandstop are all examples we have seen in Analog.
		Examples of common analog filter types is the Butterworth (very flat pass band), the Chebyshev (faster falloff at the cost of more variation in the passband), and Bessel (less phase distortion, at the cost of poor stepness at corner frequency).
	www.mines.edu /Academic/courses/physics/phgn317/labview10/index.htm (1167 words)

	Analog Wizard™ Filter: Home
		The Butterworth filter achieves its flatness at the expense of a relatively wide transition region from pass band to stop band, with average transient characteristics.
		The Sallen-Key configuration, is one of the most widely used filter topologies.
		This describes the transfer function of the filter as it relates to amplitude and phase response.
	www.analog.com /Wizard/filter/filterUserEntry (379 words)

	Microwave Engineering Online - Microwave Design Technology and News (Site not responding. Last check: 2007-09-17)
		A four-section microstrip hairpin filter topology was chosen to provide a bandpass response centred at 2.6GHz with a 3dB bandwidth of approximately 280MHz.
		The filter design dimensions were optimized to meet the specifications in the pass- band.
		The filter layout created by the S2A Layout tool was used to export a DXF file to LPKF's CircuitCAM and BoardMaster applications for fabrication on the ProtoMat 95s.
	www.mwee.com /magazine/2000/2.6ghz.htm (1001 words)

	Working with Quantized Filters (Filter Design Toolbox)
		Filter structures are described in detail in the description for the property
		You set the topology when you specify the reference filter coefficients for your quantized filter.
		After you create your quantized filter with the topology you choose, use Filter Design and Analysis Tool (FDATool) in quantization mode to change the filter topology.
	www.cs.berkeley.edu /titan/sww/software/matlab/toolbox/filterdesign/quant_q7.html (163 words)

	Northbound Event Interface (Site not responding. Last check: 2007-09-17)
		The name you choose for the filter file can be any name of your choice.
		Each filter can have different combinations of these parameters (for details on which parameters are contained within each filter; see Sample Filter Files).
		To rename or move the object that is being used as an origin in an active filter, see Renaming or Moving Objects Specified in an Origin.
	www.cisco.com /univercd/cc/td/doc/product/rtrmgmt/c12km/3_1_1/config/nei.htm (2015 words)

	Eagleware-Elanix \| GENESYS 2004
		This release introduces many features such as new synthesis topologies for filters and oscillators, updated LDMOS models, RF architecture simulation enhancements, and integrated component libraries.
		Ceramic transmission lines are excellent candidates for this filter because they provide a physically small structure with excellent Q values.
		Included are an Active Frequency Divider, new filter models that include the effects of Q, faster calculation speeds, a new error message that identifies potential stability problems in the RF architecture, and the ability to graph any sweep of a SPECTRASYS path measurement at any node in the schematic.
	www.eagleware.com /support/history/history_200403.htm (668 words)

	Working with Quantized Filters (Filter Design Toolbox)
		Filter topology (single section or cascaded nth-order sections).
		The most direct way to create a quantized filter (Qfilt object) is to create one with the default properties.
		To construct a quantized filter with properties other than the default values, follow the procedure outlined in Setting Property Values Directly at Construction.
	www.weizmann.ac.il /matlab/toolbox/filterdesign/quant_qf.html (313 words)

	MP Digest (Site not responding. Last check: 2007-09-17)
		First, no single filter topology satisfies all customer requirements or is robust enough to cover the full RF and microwave frequency range.
		While bandpass filters are popular, highpass, lowpass, and band-reject filters are often required to satisfy customer specifications.
		When a user accesses the Filter Wizard software, he or she is presented with a graphical representation of the filter outline (Figure 1).
	www.mpdigest.com /Articles/2004/May2004/K&L (764 words)

	Microstrip Filters Provide High Harmonic Suppression
		Harmonic filters are invaluable for removing unwanted higher-order harmonic signals from microwave multipliers and mixers in receiver designs, among other applications.
		Although a variety of filter configurations have been developed to reduce the level of harmonic signals, the authors investigated two varieties of bandpass filter designed for good harmonic suppression.
		Fabricated filters were measured with a model ZVK vector network analyzer (10 MHz to 20 GHz) from Rohde and Schwarz (www.rohdeschwarz.com).
	www.mwrf.com /Articles/ArticleID/12323/12323.html (887 words)

	Single Diode Increases Bandpass Filter's Q
		When implementing filters, the design goal is often to achieve maximum Q while using a minimum number of components.
		In certain applications, the Q of the filter is more important than the need for high signal fidelity in the pass-band.
		Superimposed on the graph is the frequency response of the same filter with an additional diode at the output of the op amp.
	www.elecdesign.com /Articles/ArticleID/4871/4871.html (423 words)

	"Brick-wall" lowpass audio filter needs no tuning - 9/14/2006 - EDN (Site not responding. Last check: 2007-09-17)
		The filter's frequency response should also include a notch at 19 kHz to achieve maximum attenuation at the FM-subcarrier pilot-tone frequency and thus minimize phasing problems.
		Selecting a topology for a passive filter that contains the maximum number of inductors and references all capacitors to ground yields a transformed filter that consists of many resistors, several supercapacitors, and only two capacitors.
		The finished filter design uses medium-tolerance resistors, only eight capacitors, and two LF347 quad operational amplifiers—few amplifiers for a seventh-order active filter that requires no component adjustments to meet its specifications.
	www.edn.com /article/CA6368442.html (641 words)

	Kernel Streaming Topology to Audio Mixer API Translation
		The WDM driver for an audio adapter exposes a KS-filter topology that represents the data paths through the hardware and the functions that are available on those paths.
		WDMAud walks the KS filter graph beginning at the source pin that lies at the endpoint of the filter graph and traverses the graph in the direction opposite to data flow until a sink pin is reached.
		The upstream filter's source pin is the source of the data stream that enters the connection.
	msdn2.microsoft.com /en-us/library/ms790574.aspx (789 words)

	Blackwell Online - Feedback-based orthogonal digital filters : theory, applications, and implementation
		Develops the theory of a feedback-based orthogonal digital filter and examines several applications where the filter topology leads to a simple and efficient solution.
		The development of the filter structure is linked to concepts in observer theory.
		Hence the filter topology represents a universal building block that can find application in several problems, such as spectral estimation, time-recursive computation of transforms, etc. Further, because of the orthogonality constraints satisfied by the structure, it also represents a robust solution under finite precision conditions.
	bookshop.blackwell.co.uk /jsp/welcome.jsp?action=search&type=isbn&term=0792396553&source=3246541172 (413 words)

Try your search on: Qwika (all wikis)