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Topic: Slew rate

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	IC Logic Device Slew Rate and Rise Time
		The slew rate of a device is the rate of change of it's output [from high to low, or from low to high].
		Don't allow digital logic slew rates to be slower than what is specified by the data sheet.
		Slew rate, and rise times is also effected by what is connected to the devices output.
	www.interfacebus.com /IC_Output_Slew_Rate.html (633 words)

	SkylondaWorks Scrapbook Slew Rate
		Slew rate is computed as the derivative of the time function.
		If a time series is considered as being comprised of its Fourier components, then the maximum slew rate is at the zero crossing of the highest large-signal sine function.
		As an example, a sine-wave of 1-volt maximum amplitude at a frequency of 1 MHz has a maximum slew rate of 6.28 volts/microsecond.
	www.skylondaworks.com /sc_slew.htm (0 words)

	System for adjusting slew rate on an output of a drive circuit by enabling a plurality of pre-drivers and a plurality ...
		Slew rate describes the rate at which a bus driver switches the voltage on a bus line.
		Slew rate of the bus driver is an extremely important characteristic for ensuring proper operation at high frequencies.
		Given that slew rate control 700 does not directly measure the slew rate at the output of the interface circuitry, the slew rate control signals may not always map to each PVT conditions.
	www.freepatentsonline.com /6047346.html (7488 words)

	Slew rate - Wikipedia, the free encyclopedia
		In electronics, the slew rate is a nonlinear effect in amplifiers.
		In mechanics the slew rate is given in dimensions 1/T and is associated with the change in position over time of an object which orbits around the observer.
		Slew rate is typically expressed in units of V/µs.
	en.wikipedia.org /wiki/Slew_rate (321 words)

	Slew Rate
		It is forbidden that with a Slew rate measurement a loudspeaker is attached, since the tweeter is destroyed by the high frequencies and levels.
		In the case of a measurement of the rate of rise of an amplifier, it is naturally meaningful to represent and compare input port and output channel at the same time on the oscillograph.
		The figures 6, 7 and 8 show the measurement of the Slew rate of an amplifier, which was adjusted to a gain of 20.
	www.amplifier.cd /Tutorial/Slew_Rate/SlewRate.htm (0 words)

	Slew Rate
		The slew-rate of an op-amp is defined as the maximum rate of change of the output voltage for all possible input signals.
		Slew rate is typically expressed in units of V/µs.
		Slew Rate of an OPAMP can be defined as The max rate of change of Output voltage for any possible input with repect to time.
	www.edaboard.com /ftopic240872.html (0 words)

	Arc Audio 4200SE Amplifier - Test Report - Car Audio and Electronics Magazine
		The term “slew rate” is used to define the maximum rate of change of an amplifier's output voltage with respect to its input voltage.
		In essence, slew rate is a measure of an amplifier's output section’s ability to follow its input signal.
		Slew rate is usually measured by applying a high-frequency square wave input signal and raising the level to the clipping point of the amplifier.
	www.caraudiomag.com /testreports/0610_cae_arc_audio_4200se_amplifier/performance.html (1228 words)

	Affects of Clipping on a SSTV Signal, 03 Mar 2000, KB9VAK
		They were the maximum slew rate of the baseband signal, and whether or not step 4 above (lowpass filtering in the modulator) was done.
		Baseband slew rates, when viewed through the SSTV pass bandwidth, that produce an apparent discontinuity in the baseband signal exhibit the Gibbs Phenomenon when demodulated with digital filters.
		Compare this case of a 3000 Hz per millisecond slew rate with this case of a 1000 Hz per millisecond slew rate on the white to sync transition.
	www.tima.com /~djones/clipping/sstvsim2.htm (845 words)

	Expect a slew of rate-base cuts
		TV Guide reduced its rate base by more than 3 million between 1996 and 2001; Reader's Digest cut its rate base by 2.5 million during the same period and plans to cut it again, to 11 million, in January.
		Circulation analyst Dan Capell says that this combination of reducing rate base while increasing price is both a natural way to let the air out of an overinflated circulation and make sure that a reduction results in improved margins.
		Capell notes that when Hearst Magazines reduced the rate bases of its titles across the board in 1995, "it was not well-received in the ad community," partly because the publisher failed to offer a proportionate reduction in ad rates.
	www.medialifemagazine.com /news2002/nov02/nov18/1_mon/news2monday.html (738 words)

	Slew Rate Explained
		If we are interested in the slew rate, or the rate of change of V, we need to differentiate that equation with respect to time.
		This is equivalent to multiplying the slew rate in V/uS to capacitance in uF.
		As Steve Bench points out in the other article on slew rate, a nice headroom would be about five times this value, to provide a cushion for the large peak to average ratio of music.
	ken-gilbert.com /techstuff/slew_rate_explained.htm (0 words)

	Slew Rate Limiting
		Slew rate issues are "hand-waved" in virtually every text I own; it took solid experience to unravel what was alluded to in the texts.
		As the slew limiting distortion approaches the maximum amplitude of the sine wave, further increase in input level (demand) will not cause the output to increase; and the waveform will look sort of triangular, but with a somewhat rounded top.
		As Ivan pointed out, up to exactly the slew rate limiting point, there is no slew limiting; that is, the phenomenon either exists or it doesn't.
	ken-gilbert.com /techstuff/slew_rate_limiting.html (0 words)

	741 Op-amp Characteristics
		The limiting rate of change for a device is called its "slew rate".
		The slew rate for the 741 is 0.5V/microsecond compared to 100V/microsecond for a high-speed op-amp.
		The slew rate is inherently limited by the small internal drive currents of an op-amp but is also limited by internal capacitance designed to compensate against high frequency oscillations.
	hyperphysics.phy-astr.gsu.edu /hbase/electronic/a741p3.html (287 words)

	Slew Rate etc.
		A slightly higher slew rate was needed because of dust and scratches on vinyl records exciting tip-mass resonances.
		The maximum slew rate found was equivalent to that of a full level 12kHz sine-wave, so it appears that the maximum slew rates found are not much greater.
		If amplifiers are to be tested with square waves close to the clipping level then to keep the slew rate down to the maximum level found in my CD tests the square wave must be passed through a low pass first order filter with its -3dB frequency at 5kHz.
	www.angelfire.com /ab3/mjramp/golopid/golopid5.html (0 words)

	Asteroid Flyby Modelling (Site not responding. Last check: )
		Example plots of slew and slew rate for 20 km/s flybys at approximately these values (i.e.100 km and 1000 km) are shown at Fig 8.1a-d.
		The variation of slew and slew rate with time affects the design of whichever method is used to provide the slew.
		The closer the flyby is to the target, the smaller the slew angle and slew rate are at the point of minimum acceptable imaging distance.
	homepage.mac.com /sjbradshaw/msc/flyby.html (3028 words)

	Slew rate enhancement circuitry for folded cascode amplifier patent invention
		The amplified excess tail current is used to boost the slew rate of the class AB output stage in accordance with a first polarity of the difference between the first (Vin+) and second (Vin−) input voltages.
		The drains of the input transistors are maintained at a voltage less than a transistor threshold voltage above the ground except during slewing operation of the operational amplifier to effectively isolate the current mirrors except during slewing operation.
		Although there are many operational amplifier designs capable of providing high slew rates, they unfortunately have various problems, including high noise generation, high power dissipation, ineffective operation at low power supply voltages, poorly controlled operational parameters over a range of power supply voltages, and/or redundant circuitry.
	www.freshpatents.com /Slew-rate-enhancement-circuitry-for-folded-cascode-amplifier-dt20060817ptan20060181350.php (1221 words)

	The SlewRate datatype. (Site not responding. Last check: )
		A slew rate, expressed as a percentage of the maximum.
		When a SlewRate variable is used as the dependent variable of a do-loop, the associated loop increment is specified as an Integer constant.
		The following example reduces the slew rate of the deck drive to 75% of its normal value.
	www.astro.caltech.edu /~mcs/CBI/cbiscript/SlewRate.html (58 words)

	The taming of the slew - 9/25/2003 - EDN (Site not responding. Last check: )
		The taming of the slew - 9/25/2003 - EDN
		You measure slew rate during the middle two-thirds of output movement at unity gain and express the result in volts per microsecond.
		Pulse-generator-rise-time limitations are a significant concern when attempting to accurately determine slew rate, as a unity gain amplifier's response to progressively faster pulse-generator rise times demonstrates (Figure 2).
	www.edn.com /index.asp?layout=article&articleid=CA323017&stt=000&industryid=2281&rid= (2199 words)

	PSW Recording Forums: Bruno Putzeys => Eddie Ciletti on slew rate, op amps and output transformers
		Slew Rate as a figure of merit is indeed highly overrated.
		The slew rate of a signal is the derivative (dV/dt) or rate-of-change of that signal, and depends only on the signal.
		Slew rate is a function of particular parameters in the circuit design (emitter current of the input pair and the compensation capacitor).
	recforums.prosoundweb.com /index.php/m/201569/0 (2249 words)

	ScopeDrive - Automated telescope drive electronics (Site not responding. Last check: )
		In an open loop system, the role of slewing is to move from one point to another in the shortest time without missing or gaining a step.
		When we reach the mid point of the slew, we start counting down on the same register untill we reach zero (this is the 'flat top' of our slew rate profile).
		This was quickly followed by the realization that it will not handle short slews when the slew rate fails to reach 'max step rate' by mid-slew.
	www.locl.net /homes/scopedrive/slew.html (332 words)

	Slew Rates (Site not responding. Last check: )
		The records were sampled to 24-bit audio files, at an intentionally low level, to be normalized to 16 bit full scale and then measured for slew rates at that level.
		At this point (and looking only at historic examples of huge hit records, and not even specially clean mint copies of the records) we have established that CD cannot handle the slew rates of these recordings and still have the peaks normalized to 0.
		To accurately depict these recordings, the level of the CD would have to be turned down until the maximum slew demanded was 14000 or under.
	www.airwindows.com /analysis/SlewRates.html (1310 words)

	AstroDAQ Series KnowledgeBase
		In theory, the slew rate of a waveform is the mathematical derivative (instantaneous slope) of the waveform at a point in time.
		In the AM1, slew is defined as the largest change in amplitude over a fixed period of time.
		The fastest rate of change is found at the point where the waveform crosses zero.
	www.astro-med.com /knowledge/adaqslew.html (419 words)

	Source driver for controlling a slew rate and a method for controlling the slew rate patent invention
		[0013] The slew rate is proportional to the bias current and inversely proportional to a capacitance of the capacitor.
		The slew rate of the output buffers falls within a range where an image quality of the LCD is not degraded.
		[0021] The slew rate is proportional to by a bias current and inversely proportional to a capacitance of a capacitor in the output buffers.
	www.freshpatents.com /Source-driver-for-controlling-a-slew-rate-and-a-method-for-controlling-the-slew-rate-dt20070111ptan20070008009.php (1130 words)

	High Slew Rate Electronic Load Checks New Generation Voltage Regulator Modules
		The circuit resistance is a dominant factor in the slew rate.
		Two models are currently available; one can program slew rates up to 100A/μsec at 1 μsec minimum rise time and the other up to 150A/μsec at 500 ns minimum rise time.
		The maximum slew rate was determined by checking the rise/fall time (5% to 95%/95% to 5%) and confirming no current waveform distortion.
	powerelectronics.com /mag/power_high_slew_rate (0 words)

	Amplifier Sound - What Are The Influences?
		Slew Rate # : Closely related to power bandwidth, the slew rate is the maximum rate of change (measured in Volts per microsecond) of the amplifier output.
		Slew rate distortion is caused when a signal frequency and amplitude is such that the amplifier is unable to reproduce the signal as a sine wave.
		While very few amplifiers even come close to slew rate induced distortion (AKA Transient Intermodulation Distortion) with a normal signal, this is one of the very few possibilities left to explain why some amps seem to have a less than enthusiastic response from the reviewers' perspective.
	sound.westhost.com /amp-sound.htm (8214 words)

	Slew Rate Control
		This circuit (figure 1) will impose a maximum slew rate on a signal; positive and negative rates can be independently controlled.
		The extremes of the range determine the positive and negative slew rates.
		The basic principle he uses to control the slew is the same as mine and his circuit is really simple.
	freespace.virgin.net /ljmayes.mal/pubs/slew.htm (397 words)

	diyAudio Forums - Slew rate Aleph 5 - opinions!
		He keeps telling me that the slew rate in class A amplifier is most important, and he is suggesting me not to build Aleph 5 because the slew rate is too low (30V/uS).
		To find the maximum slew rate for a 20KHz sin wave, we need the point where the signal is changing the fastest.
		If higher slew figures lead to better THD figures then so be it, but most amps slew fast enough to give high freq extension to please passing bats.
	www.diyaudio.com /forums/showthread.php?s=&threadid=30657&highlight= (657 words)

	Potentiostats: Scanning Fast
		The specification of 'slew rate' tells how fast the counter electrode can move to try to control the working-reference potential.
		This is often the case for poorly conducting solutions (low ionic strength solutions or low dielectric constant non-aqueous solvents), where the 'extra' voltage is used to overcome the resistance of the solution.
		Sometimes you will not find a slew rate specification, but you may find a specification for 'bandwidth' or 'frequency response.' You may estimate the slew rate by multiplying the bandwidth or frequency response value (in Hz) by about 3 to get the slew rate in V/s.
	www.consultrsr.com /resources/pstats/scanfast.htm (389 words)

	The "slew_rate" command. (Site not responding. Last check: )
		The slew rate of the azimuth drive (10-100 percent)
		The following example reduces the slew rate of the deck drive to 50% of its maximum speed.
		While it would be nice always to use the highest slew rate available, it has been found that at low temperatures our deck drive will only run at lower speeds, due to the viscosity of its lubricating oil.
	www.astro.caltech.edu /~mcs/CBI/cbiscript/slew_rate.html (106 words)

	JSAR: Introduction to Telescope Control & Errors (Site not responding. Last check: )
		The selection of the slew rates are designed to operate slightly under the maximum velocity of the stepper motors.
		Given that the tracking rate terms vary widely depending upon the location in the sky, the tracking rates, and hence slew rates, must be recalculated continuously as the telescope slews.
		Note that the altitude tracking rate term in Equation 3a is subtracted rather than added since the tracking rate in 4a is for zenith distance tracking rate rather than altitude tracking rate.
	homepage.mac.com /jonathansick/research/spr/control-intro/introcontrol.html (1071 words)

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