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Topic: Phase shift

Related Topics

Phase (waves)

Polyphase system

BPSK

Three phase

Phase modulation

Quadrature amplitude modulation

Amplitude modulation

Electromagnetic field

Rotating magnetic field

Electric motor

Frequency modulation

Lorenz force

Modulation

Simulation

Magnetism

	Phase Shift: New Media for a New World
		We will design the site with the personality you want to project.
		As seen on the front page, here are some examples of our past work.
		Accent Africa is designed, maintained and hosted by Phase Shift.
	www.phaseshift.com /pages/wd.html (0 words)

	Application of Advanced Phase-Shift Masks
		If in an altPSM the width of a chromium line between two phase regions of opposite phase is reduced to zero, a very narrow dark line is printed.
		An alternative is to use regions of intermediate phase (e.g.
		The numbers given are in units of a standard COG mask process — for example, 0.5 for high-resolution patterning indicates that printing a mask with a high-resolution tool (which usually has very low throughput, but costs a lot) is about 50% of what it costs to do all process steps for a standard COG mask.
	www.mentor.com /products/ic_nanometer_design/news/phase-shift_masks.cfm (1857 words)

	Nikon MicroscopyU: Phase Contrast Microscopy - Introduction
		The slight phase shift of 1/20th wavelength exhibited by the resultant particle wave (which arises from interference between the diffracted and surround waves) is typically observed for minute details in a cell, and is related to the optical path length difference.
		The mechanism for generating relative phase retardation is a two-step process, with the diffracted waves being retarded in phase by a quarter wavelength at the specimen, while the surround waves are advanced (or retarded) in phase by a phase plate positioned in or very near the objective rear focal plane.
		The transmittance of the phase shift ring in the classical phase plate is approximately 25 percent, while the pair of adjacent rings surrounding the phase shift ring in the apodized plate have a neutral density with 50 percent transmittance.
	www.microscopyu.com /articles/phasecontrast/phasemicroscopy.html (7881 words)

	Phase Shifters - Microwave Encyclopedia - Microwaves101.com
		Phase shifters are used to change the transmission phase angle (phase of S21) of a network.
		Digital phase shifters provide a discrete set of phase states that are controlled by two-state "phase bits." The highest order bit is 180 degrees, the next highest is 90 degrees, then 45 degrees, etc, as 360 degrees is divided into smaller and smaller binary steps.
		The convention followed for phase shifters is that the shortest phase length is the reference or "off" state, and the longest path or phase length is the "on" state.
	www.microwaves101.com /encyclopedia/phaseshifters.cfm (677 words)

	Designing Phase Shift Oscillators
		"Phase shift oscillator" is the term given to a particular oscillator circuit topology that uses an RC network in the feedback loop of a tube, transistor, or opamp to generate the required phase shift at a particular frequency to sustain oscillations.
		Phase shift oscillators are most commonly used in tremolo circuits in guitar amplifiers.
		When using the phase lead network, the impedance of the phase shift network is proportional to the value of R, so it should be made as large as practical, relative to the output impedance of the amplifier.
	www.aikenamps.com /PhaseShiftOscillators.html (5328 words)

	Magnequest - Transformers and Phase Shifts
		With 127 henries the phase shift at 440 hertz is reduced to 2.61 degrees.
		These phase shifts, as I have understood from posts on this board and other venues, change the nature and slope of the plate curves and introduce ellipsis that load the tube reactively and cause the plate generated distortion of the tube to increase.
		This illustrates that the lower the phase shift you desire the greater the inductive reactance must be at any given frequency which you select.
	www.magnequest.com /tech2.htm (808 words)

	Herley : Companies : Herley Farmingdale
		The difference between the input phase and the output phase is the sum of the phase shift due to the propagation through the phase shifter plus the programmed phase shift.
		The difference in phase angle of the existing rf signal at a given frequency and phase shift setting referenced to the exiting signal at the same frequency with the phase shifter set to zero degree phase shift.
		Errors in amplitude and phase will occur if the biphase modulator deviates from the ideal, eg: changes state from 0 to 180 ° with constant amplitude or if the attenuator has an associated phase shift as attenuation is varied.
	www.herley.com /index.cfm?act=app_notes¬es=iqv_phaseshift (4680 words)

	About Phase
		Phase shift is one of those truly confusing topics in audio, yet along with frequency and amplitude, phase is one of the primary conceptual building blocks of any audio waveform.
		A 1 ms delay for a frequency of 250 Hz causes a phase shift of 90 degrees, whereas for 500 Hz it causes a phase shift of 180 degrees.
		The amount of phase shift is derived from the length of the delay as a fraction of the period of the waveform.
	emusician.com /mag/emusic_phase/index.html (1767 words)

	Definition: phase-shift keying (Site not responding. Last check: )
		In digital transmission, angle modulation in which the phase of the carrier is discretely varied in relation either to a reference phase or to the phase of the immediately preceding signal element, in accordance with data being transmitted.
		In a communications system, the representing of characters, such as bits or quaternary digits, by a shift in the phase of an electromagnetic carrier wave with respect to a reference, by an amount corresponding to the symbol being encoded.
		If the number of recognizable phase angles is increased to 4, then 2 bits of information can be encoded into each signal element; likewise, 8 phase angles can encode 3 bits in each signal element.
	www.atis.org /tg2k/_phase-shift_keying.html (233 words)

	Shift Work - SleepChannel
		Nearly 20% of employees in industrialized countries are employed in shift work, which requires them to drastically change their sleep habits weekly or even daily.
		In nonfluctuating shift work, the shift in circadian rhythm remains constant once the body adapts to it.
		Shift work change affects circadian rhythm, which, similar to delayed sleep phase syndrome and jet lag, desynchronizes the body's sleep-wake schedule.
	www.sleepdisorderchannel.net /shiftwork (515 words)

	High-Pass/Low-Pass Phase Shifters - Microwave Encyclopedia - Microwaves101.com
		If a constant phase shift is desired over a wide frequency range, the switched line phase shifter isn't going to cut it.
		Note that between 4 and 8 GHz the phase shift (green trace) stays within -90 to -99 degrees, a nearly flat response that is not possible from a switched line phase shifter.
		In many real phase shifters you'll find that more than 50% of the phase shift is done in the low pass network and less than 50% in done in the high -pass.
	www.microwaves101.com /encyclopedia/phaseshifters_HPLP.cfm (704 words)

	ProSoundWeb \| Phase Shift
		Phase shift is also pretty bad in this situation, but it is primarily a case of your having removed too much of the signal.
		By applying minimum phase corrective equalization filters to the system (analog or digital), you are then effectively correcting both the magnitude and phase response of the system simultaneously (at that specific acoustic position).
		If one had a minimum phase speaker which had a non flat response, one could use a normal filter or EQ to make both the amplitude AND phase flat at the same time as the filter correction has the right amplitude and phase to counter act the speakers response.
	www.prosoundweb.com /live/labbest/phaseshift/phaseshift.shtml (1092 words)

	Affordable phase shifters for electronically scanned phased array antennas
		Phase shifters are critical elements for electronically scanned phased array antennas, and typically represent a significant amount of the cost of producing an antenna array.
		Phase shifters are the devices in an electronically scanned array that allow the antenna beam to be steered in the desired direction without physically re-positioning the antenna.
		Because phase shifters possess the ability to change the phase of a signal, it is possible to sample the undesired harmonics and change their phase by 180 degrees.
	rfdesign.com /mag/radio_affordable_phase_shifters (2228 words)

	Tudor's phase shifting (Site not responding. Last check: )
		Typically, phase shift in performance is the use of a piece of equipment (Phase Shifter or Phaser) that shifts the phase of a signal according to a carrier wave, usually a sine wave, to ceate a very 1970's sounding sweep of harmonics within the original signal.
		Tudor used this typical type of phase shift from time to time but, as usual, the carrier wave was to rigid for him; he wanted more control.
		One of David's most fundamental uses of phase shift was that which occors within the acoustic environment as he changes the position of his sound.
	www.emf.org /tudor/Electronics/phase.html (265 words)

	EDN -- 02.15.96 Digital potentiometer controls phase shift (Site not responding. Last check: )
		Dallas, TX To alter the phase response of a signal without changing its amplitude, you commonly use an all-pass filter, as in Figure 1a.
		As the signal frequency varies from dc to infinity, the phase shift varies from 0° to 180°.
		With this circuit, whose values are optimized for phase shifting in the audio range, the phase at any given frequency is under digital control.
	www.edn.com /archives/1996/021596/04di4.htm (337 words)

	Moulton Laboratories :: About Comb Filtering, Phase Shift and Polarity Reversal
		Because the phase shift is exactly 360°, which is functionally equivalent to a 0° phase shift, the original signal and the delayed signal overlay exactly and their amplitudes added together result in a doubling of overall amplitude at each point in the waveform (which results in an overall increase in amplitude of 6 dB).
		First, the amount of phase shift varies for a given delay time as a function of frequency, so that lower frequencies have less phase shift, higher frequencies have more phase shift, and each frequency has a unique amount of phase shift.
		One quirky part of this is that for any repeating wave shape, 360° of phase shift is the functionally the same as 0° of phase shift, so we usually don't worry about the multiples of 360°, just the number of degrees between 0 and 360.
	www.moultonlabs.com /index.php/more/about_comb_filtering_phase_shift_and_polarity_reversal (987 words)

	The technology of Phase Shifters and Flangers
		The trick to getting phasing automated is to automate changing either the resistance or the capacitance; since capacitors are notoriously hard to modulate, every commercial phase shifter has come up with some scheme for varying a resistor in a phase shift stage - none vary the capacitor that I have seen.
		The Univibe uses identical phase shift stages composed of a darlington connected pair of transistors, bootstrapped for high input impedance, and with equal collector and emitter load resistors for producing the two out-f phase signals needed for the next stage.
		Their "Small Stone" phase shifter used an "Operational Transconductance Amplifier" or OTA as the variable resistance in a phase stage, and an internal darlington buffer in one of the OTA IC's on the market as the buffer for the next stage.
	www.geofex.com /Article_Folders/phasers/phase.html (3302 words)

	Test Driven Design Phase Shift
		A phase shift is a phenomenon that occurs in TestDrivenDevelopment when simple ReFactoring ceases to be adequate for the incremental changes being performed.
		This phenomenon is termed a "phase shift", due to its analogy to phase shifts in chemicals: at one temperature, a chemical may be a solid, but if heat is injected, at some point the temperature will stop increasing while the solid converts into a liquid.
		Phase shifts can occur outside TestDrivenDevelopment as well, but TestDrivenDevelopment can make phase shifts easier to deal with: the principle of YouArentGonnaNeedIt causes phase shifts to not occur unless they are really necessary, thus avoiding unnecessary and costly rewrites and resulting complexity.
	c2.com /cgi/wiki?TestDrivenDesignPhaseShift (982 words)

	Phase shift cancellation of TV FM DX signals
		The method of phase cancellation is to use two separate antennas to enable the removal of an unwanted signal, while allowing reception of a DX signal at the same frequency.
		Phase cancellation nulls will be greater when there are minimal metallic objects in the vicinity of the DX and reference antennas.
		The phasing unit to be described is based around a resistive network, which will enable 360 degrees phase shift over a wide range of frequencies from approximately 15MHz to UHF.
	www.geocities.com /toddemslie/phase_cancellation.htm (2173 words)

	[No title]
		In human beings, sleep is normally initiated during the rising phase of the melatonin rhythm and declining phase of the body temperature rhythm.
		Symptoms of jetlag are thought to be caused by desynchronization of circadian rhythms from the external environment, the transient change in the phase relationship of individual rhythms, and perhaps changes in the amplitude of rhythms.
		shifts can, and often do, coincide with the time of day when the biological drive for sleepiness is high and performance is low.
	www.mercola.com /2001/sep/29/shift_work.htm (2558 words)

	Moulton Laboratories :: About Comb Filtering, Phase Shift and Polarity Reversal
		These varying levels are due to the constructive and destructive interference patterns caused by changing phase shift between the direct signal and all the reflected paths as the meter’s location changes.
		Phase shift is one of the three fundamental attributes of sound waves (the others are frequency and amplitude).
		Phase shift occurs all the time in non-technological nature, but the manipulation of polarity of a sound (in either the acoustical or electronic realms) exists only in high-tech items such as loudspeakers (acoustically) and audio circuits (electronically).
	www.moultonlabs.com /index.php/more/about_comb_filtering_phase_shift_and_polarity_reversal/P1 (1303 words)

	Phase Shift Keying (Site not responding. Last check: )
		Phase shift keying is a technique which shifts the period of a wave.
		We can shift it another quarter, if we wanted to, so the original wave would be shifted by half it's period.
		This technique of letting each shift of a wave represent some bit value is phase shift keying.
	www.physics.udel.edu /wwwusers/watson/student_projects/scen167/thosguys/psk.html (210 words)

	The Electron Phase Shift
		Naturally, all Huygens wavelets would be in phase before reaching the core, but they would still be in phase beyond it.
		These out of phase wavelets should strongly indicate to any good optician that such an electron is a nearly lossless system.
		Their phase is different because there is a phase shift there.
	www.glafreniere.com /sa_phaseshift.htm (1746 words)

	Electronic phase reflector with enhanced phase shift performance patent invention (Site not responding. Last check: )
		A varactor based phase shifter that increases phase shift range using an impedance transformer to impart a low characteristic impedance between an input port and a reference node port.
		Thus, the amount of phase shift provided is a monotonic function that varies as the inverse of the line impedance.
		In such an implementation, the two-port phase shifters are replaced by single-port variable impedances, specifically ones that use a quarter wave transmission line of a lower characteristic impedance to affect a phase change.
	www.freshpatents.com /Electronic-phase-reflector-with-enhanced-phase-shift-performance-dt20051208ptan20050270123.php (1347 words)

	Bindicator: Products
		Bindicator's patented Phase Tracker technology is designed to solve the most challenging continuous level applications.
		Phase Tracker is ideal for the measurement of level of solids, liquids and slurries.
		Phase Tracker can accurately and reliably measure the level of bulk solids and powders during the fill cycle, regardless of dust or material variations in density or moisture.
	www.bindicator.com /products/cont/phaseTracker.asp (207 words)

	Tech Brief 3: Digitally Control Phase Shift - Maxim/Dallas
		Altering the phase response of a signal without changing its amplitude characteristics is commonly performed using an allpass filter, as in Figure 1.
		Several of these phase shift sections can be cascaded to realize greater phase shifts.
		Four sections of the DS1806 are used to control the phase shift of each stage under microprocessor control.
	www.maxim-ic.com /appnotes.cfm/appnote_number/559 (663 words)

	Phase Shift Oscillator
		generated signal in its ouput is out of phase with output signal by 180 degree.
		and the phase shift around the closed loop should be zero.
		in a phase shift oscillator a phase shift network is used which shifts the phase of the output through 180° then this shifted output is fed into the inverting input which results in a total of 0° phase shift.
	www.edaboard.com /ftopic103523.html (139 words)

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