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Topic: Sallen Key filter

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Active filter

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	Circuit Sage: Filter Design and Analysis
		Active filter designer (mirror) and HF filter design by John Owens.
		Filter Workshop and Active Filter Workshop by Frank Ostrander.
		Mathematics for Circuits and Filters, Wai-Kai Chen, 0849300525.$70.
	www.circuitsage.com /filter.html (1081 words)

	Sallen Key filter information - Search.com
		A Sallen and Key filter is a type of active filter, particularly valued for its simplicity.
		Although the filters depicted here have a passband gain of 1 (or 0 dB), not all Sallen and Key filters have a gain of 1 in the passband.
		Sallen Key filters are relatively resilient to component tolerance, although obtaining high Q factor may require extreme component values or higher gain in the non-inverting amplifier.
	www.search.com /reference/Sallen_Key_filter (234 words)

	Active isolated-integrator low-pass filter with attenuation poles - Patent 6909321
		The active low-pass filter system of claim 11, wherein the low-pass filter circuit includes a resistive forward signal flow branch between the input terminal and the output terminal, the isolated-integrator band-reject filter is incorporated into the resistive forward signal flow branch.
		3 is a Bode diagram of the amplitude response of the filter of FIG.
		3 is the Bode diagram of the amplitude response in decibels (dB) of the third-order low-pass Sallen & Key filter 26 of FIG.
	www.freepatentsonline.com /6909321.html (3269 words)

	Sallen Key filter (Site not responding. Last check: )
		A Sallen and Key filter is a type of active filter, particularly valued for its simplicity.
		Although the filters depicted here have a passband gain of 1 (or 0 dB), not all Sallen and Key filters have a gain of 1 in the passband.
		Sallen Key filters are relatively resilient to component tolerance, although obtaining high Q factor may require extreme component values or higher gain in the non-inverting amplifier.
	nba.servegame.org /en/Sallen_and_Key_filter.htm (343 words)

	Active Filters
		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 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.
		A first order allpass filter section with flat amplitude response but phase shift that changes from 0 degrees to -180 degrees, or -180 degrees to -360 degrees, is often used to correct phase response differences between drivers.
	www.linkwitzlab.com /filters.htm (2352 words)

	Introduction
		This active filter was primarily designed to be used with the bass boxes presented on these pages.
		The filter circuit encompasses an input buffer with gain, a high pass filter, a low pass filter, and a level control.
		Rectified and filtered voltage is fed to two series regulators in the far end of the box.
	www.lennartlabs.se /projects/activefilter/activefilter1.htm (1172 words)

	Sallen-Key Low Pass Filter Design Equations
		The Sallen- Key filter is a very popular active filter which can be used to create 2nd order filter stages that can be cascaded together to form larger order filters.
		Each of the complex conjugate pole pares are then implemented with a Sallen-Key filter, and the circuits are cascaded together to form the complete filter.
		We've created a low pass Butterworth Sallen-Key filter calculator, which automatically computes the resistor and capacitor values for a filter with a given number of poles.
	www.daycounter.com /Filters/SallenKeyLP/Sallen-Key-LP-Filter-Design-Equations.phtml (195 words)

	Sallen-Key lowpass-filter stopband limitations - 8/3/2006 - EDN (Site not responding. Last check: )
		The data indicates that the lowpass filters are performing as you would expect for a little more than a decade after the cutoff frequency of 1 kHz.
		The caveat to this action is that the following filter may interfere with the phase response of your intended filter, which may cause additional ringing in the time domain.
		When an inverting filter is an acceptable alternative, you can use a multiple-feedback circuit, which does not display this reversal in the gain response at higher frequencies and does not swing the input stage's common-mode voltage.
	www.edn.com /article/CA6356063.html?ref=nbenn (600 words)

	Sallen-Key Low-Pass Filter
		Although there are many filter types and ways to implement them, here’s an active low-pass filter that’s greatly simplified if R1=R2 and the op amp stage is a unity gain follower (RB=short and RA=open).
		Another advantage of the active filter is that the knee hasn’t lost its sharpness.
		A properly functioning op amp is essential to the filter’s operation.
	www.ecircuitcenter.com /Circuits/opsalkey1/opsalkey1.htm (638 words)

	Body
		The magnitude of the response at the cut-off frequency is dependant on the Q of the circuit.
		This is interesting because a filter can easily be made with an independently adjustable cut-off frequency and Q using this approach (as opposed to the previous approach).
		This filter has been refined by adding an op-amp, where the amplifier was, that is wired to be non-inverting with variable gain.
	www.t-linespeakers.org /tech/filters/Sallen-Key.html (2029 words)

	THD: Sallen&Key versus MFB \| Juli/Aug. 2005 \| Bouwontwerpen
		Actieve filters zijn er in verschillende soorten, waarbij de Sallen&Key-versie wellicht het meest toegepaste type is. Hierbij wordt meestal gebruik gemaakt van een spanningsvolger, maar ook versterking is mogelijk (twee extra weerstanden).
		Een nadeel van dit filter is de relatief grote gevoeligheid voor de toleranties van de componenten.
		Een voordeel is wel dat rond een enkele versterkertrap ook complexere filters dan derde orde mogelijk zijn, maar in zo'n geval worden wel hoge eisen gesteld aan de componenten.
	www.elektuur.nl /Default.aspx?TabId=28&art=91007493&PN=On (152 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.cn /tarticle/view_article.cfm/article_id/121 (2884 words)

	Sallen Key filter . Filter design . Q factor
		Finite impulse response FIR filters do not use feedback, and are inherently stable.
		FIR filter coefficients are normally symmetrical, and that makes them phase neutral by nature.
		FIR filters are generally easier to design: The Remez exchange algorithm is one suitable method for designing quite good filters semi-automatically.
	www.uk.knowledge-info.org /Sallen_Key_filter-UK-7515775-bj (349 words)

	SDTV Reconstruction Filter with Adjustable Group Delay - Maxim/Dallas
		Such filters are used for video reconstruction of RGB and component video (Y, Pb, Pr) signals following a DAC to remove the higher frequency replicas of the signal, and as an anti-aliasing filter before an ADC.
		To preserve the quality of the video waveform, it's important that the filter's group-delay variation, and the group-delay differential between filters, be as low as possible.
		By keeping the sum of R3 and R8 constant and equal to the original R3 value, the dominant-pole frequency isn't affected, preserving the bandwidth, but as the value of R3 increases, a "lead" term is introduced, reducing the rate of change of the phase, and consequentially, the group delay.
	korea.maxim-ic.com /appnotes.cfm/appnote_number/1028 (377 words)

	有源滤波器设计应用 - FILTERPRO - 德州仪器 TI 软件文件夹
		Because the band-pass filter is most often used for tone detection and high Q filters usually need high gain, a method was found to make the gain equal to the Q of the filter.
		The FilterPro V2.0 wide-band-pass filter uses a high-pass filter cascaded with a low-pass filter.
		This is very useful for band-pass filters with a Q of less than 1 because the passband response is easily made flat and because the filter types such as Bessell, Butterworth, etc. are used.
	focus.ti.com.cn /cn/docs/toolsw/folders/print/filterpro.html (419 words)

	Magazine \| July/August 2005
		A disadvantage of this type of filter is its relatively high sensitivity to component tolerances.
		Measurements made on such filters have shown that component variations affect not only the filter characteristic but also the amount of distortion.
		However, an advantage is that filters more complex than third-order types can also be realised using a single amplifier stage, although severe requirements are placed on the component values in such cases.
	www.elektor-electronics.co.uk /Default.aspx?tabid=27&year=2005&month=7&art=52877&PN=On (126 words)

	Active and Passive Filter Designer
		The active filter designer supports low pass, high pass, bandpass, notch, and delay filters that can be set up with a Butterworth, Chebyshev, Bessel, elliptic, or Inverse-Chebyshev response.
		The passive filter designer supports low pass, high pass, bandpass, and notch filters than can be set up with a Butterworth, Chebyshev, or elliptic response.
		The created filter can be sent to a new circuit, to a currently loaded circuit, or can be made into a macro component that is easily accessed through the Component panel or menu.
	www.spectrum-soft.com /demo/filter.shtm (234 words)

	A Beginners Guide to Filter Topologies - Maxim/Dallas
		This application note will look at different filter types, shed some light on terminology and provide a foundation to base the selection and allow the design of a filter to be a little more science and a little less magic.
		This filter is also referred to as a positive feedback filter since the output feeds back into the positive terminal of the op amp.
		That is, as you shift fc in the frequency domain, the Q value remains the same, but the bandwidth of the filter decreases as you increase fc and increases as you decrease fc.
	www.maxim-ic.com /appnotes.cfm/appnote_number/1762/ln/en (1645 words)

	Sallen Key (Site not responding. Last check: )
		The basics of analog filters is explained including: RC filters, advantages and disadvantages of passive and active filters, sallen-key filters, state variable filters, and biquad filters.
		Although low-pass filters are vital in modern electronics, their design and verification can be tedious and time consuming.
		The Sallen-Key highpass filter is obtained by interchanging the R's and C's in the lowpass filter...
	wavedigitalfilter.flakwave.com /sallenkey (767 words)

	Butterworth Low-Pass Filter
		Filters are classified according to the functions that they are to perform, in terms of ranges of frequencies.
		We will be dealing with the low-pass filter, which has the property that low-frequency excitation signal components down to and including direct current, are transmitted, while high-frequency components, up to and including infinite ones are blocked.
		The ideal low-pass filter response can be approximated by a rational function approximation scheme such as the Butterworth response.
	www.ece.uic.edu /~jmorisak/blpf.html (458 words)

	Active filters - The analog filters portal
		The demo edition is able to design highpass filters and lowpass filters of order two.
		We will start, creating a rumble filter, a highpass filter which can be used e.g.
		This highpass filter should have a flat amplitude response in the passband.
	www.analogfilters.com (454 words)

	What's All This Sallen-Key Stuff, Anyhow?
		The theory of the filter works just fine when each resistor is increased by a factor of n, and the caps are likewise shrunken by n—not rocket science.
		Now the rolloff goes down a lot further, and the capacitors are smaller and cheaper.
		That will further roll off the frequency response of the filter, and it will further decrease the amount of current fed into the output via R1 and C1.
	www.elecdesign.com /Articles/ArticleID/13480/13480.html (792 words)

	[No title] (Site not responding. Last check: )
		Sallen/Key Bandpass filter In this experiment, we will investigate active filtering by the aid of a popular filter called the Sallen and Key bandpass filter, which was named after its inventors.
		For this reason, the filter in Figure 1 may be configured as, and is sometimes called, an Equal Component Sallen and Key Filter.
		The frequency response of the low pass filter is not as straightforward as that of the bandpass filter, however.
	people.clarkson.edu /~ortmeyer/filterdesign.doc (2813 words)

	Resolution on a CRT HDTV - High Def Forum - Your High Definition Community & High Definition Resource
		The reconstruction filtering after a DAC is one of the most poorly understood of video applications.
		This "hold" is a digital filter with a sin (x)/(x) characteristic, shown in Figure 7, from whence it got its name, Sinc[12] corrector.
		The good news is the "hold" has a pole of attenuation centered on FS, so you don't have to filter the sample clock, but applications still use the attenuation at FS as a reference...
	www.highdefforum.com /showthread.php?p=204368&mode=threaded (498 words)

	Low-Cost, 30MHz, Triple-Channel HDTV Reconstruction Filter - Maxim/Dallas (Site not responding. Last check: )
		In HDTV applications, lowpass filters are used for reconstruction of RGB and component video (Y, Pb, and Pr) signals.
		It is a three-pole, Sallen-Key Butterworth lowpass filter, in which the current DAC generates the video signal, and the resistor (RL) sets the amplitude.
		The filter performance is the same as in the dual-supply configuration.
	www.maxim.de /appnotes.cfm/appnote_number/3520 (441 words)

	Learn The Limitations Of Low-Pass Sallen-Key Filters
		The Sallen-Key low-pass filter shown in Figure 2 is an example of how an amplifier is used in this manner.
		The most frequently designed filters require low Q values, so this should rarely be a design issue.
		This is an excellent article which explains the sallen and key filters very well.
	www.elecdesign.com /Articles/Index.cfm?ArticleID=7486&pg=1 (1014 words)

	A-101-1 Vactrol Filter
		Both the A-101-1 Vactrol Multitype filter and the A-106 MS20 filter have their origins in the standard non-inverting amplifier low pass filter design (so-called VCVS low pass, VCVS = voltage controlled voltage source) shown on the left.
		With a = 1 one obtains a filter without resonance, a = 1.268 leads to a Bessel filter, a = 1.586 to a Butterworth filter and a = 2.234 to a Tschebyscheff filter.
		Even the filters of the MS20 are modifications of the basic circuit shown at the beginning.
	www.doepfer.de /a1011_tec.htm (782 words)

	ePanorama.net :: View topic - No phase shift filter (Site not responding. Last check: )
		All real filters only have information from the past to work with.
		filter is going to need quite a bit of education.
		Notch filters might do this if they have infinite attenuation.
	www.epanorama.net /phpBB2/viewtopic.php?t=42358 (2261 words)

	[No title]
		In the well known three opAmp realisation of an Instrumentation Amplifier it is easy to insert one pole (caps over both feedback resistors of the input stage), but this only filters the dif signal, the common mode signal is unaffected.
		Do not make the mistake to 'mirror' the Sallen-Key filter around both positive and negative input: this is not stable.
		Common mode filtering can be done with RC or LC elements at the input.
	www.rfglobalnet.com /forums/Default.aspx?g=posts&t=3340 (359 words)

	Active Filter Four
		This filter board resulted from my looking for an active filter board at the same time as Jens felt like designing a board.
		It was designed as a flexible crossover board with features not often found on DIY boards.
		Fourth order filter sections can be combined with notch filters to create Cauer-Elliptic filters.
	mysite.verizon.net /vze3xvxs/audio/id20.html (269 words)

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