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	Analogue switch - Wikipedia, the free encyclopedia
		The switching element is normally a MOSFET, which is a type of transistor.
		The control input to the switch is a standard CMOS or TTL logic input, which is shifted by internal circuitry to a suitable voltage for switching the MOSFET.
		Analogue switches are usually manufactured as integrated circuits in packages containing multiple switches (typically two, four or eight).
	en.wikipedia.org /wiki/Analogue_switch (358 words)

	Switch - Wikipedia, the free encyclopedia
		A biased switch is one containing a spring that returns the actuator to a certain position.
		An example of a push-to-break switch is a button used to release a door held open by an electromagnet.
		Switches can be designed to respond to any type of mechanical stimulus: for example, vibration (the trembler switch), tilt, air pressure, fluid level (the float switch), the turning of a key (key switch), linear or rotary movement (the limit switch or microswitch), or presence of a magnetic field (the reed switch).
	en.wikipedia.org /wiki/Switches (2183 words)

	Encyclopedia :: encyclopedia : Railroad switch (Site not responding. Last check: 2007-11-01)
		Given, however, the potential for derailment at all but the slowest speeds in thus "forcing" a switch, and the fact that the switch blades on all main running-lines are mechanically or electrically locked into position, it is normal to set switches in the appropriate position for trailing movements too.
		The position of the switch is usually changed electrically on main lines and controlled from a remote control center or signal box, from where staff also alter semaphores or light signals correspondingly.
		This is generally referred to as a switches 'number.' For example, on a 'number 12' switch, the rails are a distance of one foot apart a distance of twelve feet from the center of the frog.
	www.hallencyclopedia.com /Railroad_switch (1732 words)

	Analogue switch
		This means that it cannot be used in high-voltage circuits.
		Also, since there is no metallic path between the input and output, the maximum current allowed to flow through the switch is much smaller than that in a typical relay.
		This is typically a number of megohms or gigohms.
	www.ebroadcast.com.au /lookup/encyclopedia/an/Analogue_switch.html (301 words)

	Analogue switch patent invention
		The switch (21) comprises a first bipolar transistor (22), having a collector connected to the first switch terminal (2) and an emitter connected to the second switch terminal (3), and a second bipolar transistor (23), having an emitter connected to the first switch terminal (2) and a collector connected to the second switch terminal (3).
		An analogue switch operates such that when the switch is closed a voltage at a first switch terminal, derived from other parts of the circuit, is switched to a second switch terminal.
		The emitter of the parasitic PNP transistor is the base of the switch transistor, the base of the parasitic transistor is the collector of the switch transistor, and the collector of the parasitic transistor is the substrate of the device.
	freshpatents.com /Analogue-switch-dt20060330ptan20060066385.php?... (1885 words)

	Multiplex Profi 4000 programming example
		Analogue switches may be based either on physical controls, or servos.
		When the analogue switch is based on a servo, the value of the switch is the % displacement of the servo from one end of its travel.
		For example you could base the analogue switch on a slider with a non-linear response, instead of a switch.
	www.rc-soar.com /multiplex/4000/tutorials/analog_switches.htm (813 words)

	Matrix array image sensor chip - Patent 5345266
		The analogue charge sense amplifier includes a first amplifier in the form of an inverting charge integrator which provides a preliminary detection of the charge accumulated in the sensing cell by integrating the charge to produce a voltage which is capacitively stored in a voltage storage means.
		Further digital circuitry produces enabling signals that control analogue switching or sense circuitry to enable the signals on consecutive bit-lines to be connected to the output.
		analogue switch means connected between each column and the horizontal scan means for receiving image data from said cells, each of said analogue switch means being also connected by a common conductor to a sensing amplifier forming the output of the integrated circuit said integrated circuit being characterised in that:
	www.freepatentsonline.com /5345266.html (3723 words)

	House of Commons Hansard Debates for 15 Mar 2005 (pt 3)
		analogue coverage for our part of the world, yet it is proposed that, somewhere between now and 2008, we will move exclusively to digital and complete the switchover in the first tranche of regions.
		Analogue switch-off may start in just three years, yet little has been done to prepare for it, and there are number of problems attached to it, which have been mentioned.
		They are content with their analogue service, and are at best alarmed by and at worse positively opposed to the suggestion that that service will cease and that they will be compelled to move over to digital take-up.
	www.publications.parliament.uk /pa/cm200405/cmhansrd/cm050315/halltext/50315h03.htm (11853 words)

	Analogue switch patent invention
		A switching circuit according to claim 1, wherein the switching circuit further comprises a common current source for supply of said control current to the base of each of the first and second transistors and for supply of said slave control current to the base of the third and fourth transistors.
		A switching circuit according to claim 11, wherein the common current source is arranged to supply said control current and said slave control current to the bases of the first and third transistors and the second and fourth transistors either independently or together.
		A switching circuit according to claim 1, wherein the programming input of the first controlled current source is connected to the first slave terminal via a first biasing resistor, and the programming input of the second controlled current source is connected to the second slave terminal via a second biasing resistor.
	www.freshpatents.com /Analogue-switch-dt20060330ptan20060066385.php?type=claims (749 words)

	Components in Electronics - CIE (Site not responding. Last check: 2007-11-01)
		When the switch passes a signal through, the channel on resistance will be modulated with voltage transient inputs that could potentially causes the phase delay difference due to on resistance variation.
		Analogue switches with lower bandwidth could potentially cause more deterministic jitter for the fast rise/fall time event with full rail swing.
		With the increased needs of USB functions in portable design, wide bandwidth analogue switches with high esd and better off isolation performance are needed extensively in applications such as pdas, cell phones and digital still cameras for reliable operation while offering more attractive slim designs.
	www.cieonline.co.uk /cie2/articlen.asp?pid=&id=3219 (1003 words)

	Government Consultation Document
		NERA were asked to construct an economic assessment of the migration from analogue to digital television broadcasting and to examine the impact that Government policies might have on securing analogue switch-off in 5, 10 and 15 years' time.
		However, it is unlikely that towards the end of the period of analogue transmission the Government could justify requiring broadcasters to repair a failed analogue transmitter at significant cost to reach a very small number of analogue receivers.
		NERA recommend that once Government has named a date for switching off analogue transmissions, the sale of all analogue receiving equipment should be accompanied by consumer information making clear that additional equipment would be needed after that date to enable the analogue equipment's continued use.
	www.ofcom.org.uk /static/archive/ra/topics/broadcasting/document/digittv/dtvcons.htm (3457 words)

	Selecting the Right CMOS Analog Switch - Maxim/Dallas
		for a typical CMOS analog switch causes a linear reduction of signal voltage that is proportional to current passing through the switch.
		If the switch (P2 or N2) is on, the COM output is clamped to the supply by two internal 'booster' FETs.
		A cross-point switch is usually an M x N device, whereby any or all of M inputs may be connected to any or all of N outputs (and vice versa).
	www.maxim-ic.com /appnotes.cfm/appnote_number/638 (2875 words)

	Switch
		In applications where multiple switching options are required, (i.e.
		a telephone service) mechanical switches have long been replaced by electronic variants which can be intelligently controlled and automated.
		As long as the bounces are small enough not to take the switch between these positions bounce problems will be completely eliminated.
	www.brainyencyclopedia.com /encyclopedia/s/sw/switch.html (2224 words)

	Multiplex Profi 4000 programming example
		Note: analogue switches are normally based on the position of a control stick.
		Note the analogue switch (A212) attenuates each input between 0 and 100%, but in opposite senses.
		Each input is first multiplied by the value of the analogue switch, and the mixer adds the resulting values together.
	www.rc-soar.com /multiplex/4000/examples/morphing.htm (635 words)

	Analogue switch upogrades existing designs: News from Intersil
		The ISL84684 has two independent switches, allowing it to replace two discrete SPDT devices where space is critical.
		When operated from a 2.7V supply, the ISL84684 switches have a typical on-resistance flatness and channel matching of 0.03ohm, making them ideal for use in low distortion audio paths such as MP3 players in cellphones, and CD audio devices.
		Switching speed at a supply of 2.7V is typically a very fast 14ns turn-on and 6ns turn-off, reducing switching noise.
	www.electronicstalk.com /news/ina/ina314.html (366 words)

	MediaGuardian.co.uk \| Media \| Leader: Analogue switch-off
		The government's case - that the BBC ought to fund it because it paid for the transition from fl-and-white to colour - is disingenuous.
		No one was forced to buy a colour TV set, as the two existed in tandem, whereas all analogue sets without a set-top box will be useless by 2012.
		This is mainly because they have a higher proportion of multichannel pipes, including cable, which could continue to carry analogue signals after the switch-off, while Britain has a higher proportion of aerials, which will be redundant after 2012 if not converted.
	media.guardian.co.uk /site/story/0,,1760761,00.html (481 words)

	Analogue switch promises lower distortion: News from Intersil (Site not responding. Last check: 2007-11-01)
		The ISL84684 is a true bidirectional analogue switch with less than 0.5ohm of resistance over the full input signal range providing lower signal loss and lower distortion of midi and voice signals.
		A low voltage, dual single-pole/double-throw (SPDT) analogue switch, Intersil's ISL84684 is designed to minimise signal distortion in the audio range.
		The number of analogue input pins on baseband chipset devices may be limited and digital geometries may not be optimised for good analogue performance.
	www.electronicstalk.com /news/ina/ina366.html (492 words)

	The Scotsman - Business - ANALYSIS: Getting on-message over the analogue switch-off
		The closing down of terrestrial analogue services - at a stroke making 99 per cent of the nation’s analogue televisions redundant forcing viewers to buy new technology they never knew they needed - is a wheeze that has rested on the breathy "technology of the future" speak in which this government excels.
		The analogue spectrum is worth billions to an Exchequer, which has so far got away with the outrageous argument that airwaves in Britain belong to the government.
		When the time came to switch off the analogue signal, only a few curmudgeons still bewailing the loss of 405 line fl and white broadcasting would be sans digital.
	thescotsman.scotsman.com /business.cfm?id=342562002 (1206 words)

	Braemac - Analogue switch and multiplexer
		SILICONIX has released an analogue switch and multiplexer packaged in a 3mm by 3mm QFN-12 package and aimed at battery-operated portable applications.
		The DG2032 dual SPDT analogue switch and DG2034 4:1 multiplexer combine 3Ω on-resistance, low power consumption, and good switch performance while operating over a wide power supply and analogue signal range of 1.8V to 5.5V.
		Unlike other small analogue switches aimed at audio only, these parts cater to the needs of both audio and higher-speed analogue signal switching.
	www.ferret.com.au /articles/c2/0c01f2c2.asp (320 words)

	No analogue switch-off until equipment is 'affordable' - Cable Forum
		We will not have truly converted from analogue to digital until the TV in the corner of your room picks up digital TV signals through its aerial in exactly the same way it currently does for analogue.
		In my opinion, this 'analogue switch-off' is an example of something that sounded good in the meeting, but afterwards, everyone assumed someone else will be sorting it out.
		Whenever a flourescent light is switched on, the boiler switches between hot water/heating mode or the compressor in the fridge starts working the picture and sound on certain channels always goes 'splat' - it is really annoying.
	www.cableforum.co.uk /board/showthread.php?t=18728 (1906 words)

	BBC NEWS \| Entertainment \| US analogue TV switch-off in 2009
		The analogue television switch-off in the UK is set to take place gradually from 2008-2012.
		Moves to bring about the end of analogue broadcasting in the US have been under way for years.
		Under existing law, broadcasters would be required to cease analogue transmissions when digital TV reaches 85% of the population, but this is a threshold which is not expected to be reached.
	news.bbc.co.uk /1/hi/entertainment/4673848.stm (288 words)

	Digital Spy Forums - analogue switch off put back to 2012?
		Analogue switch off is a constantly moving target - remember that back in 1998 it was touted to happen as early as 2005 - less than 12 months from now.
		If there are no steps made to switch off by then serious questions will be asked with regards to the BBCs waste of licence fee payers money on simulcasting while not providing the full range of servuces to a significant minority of the population, and the whole viability of the DVB-T platform.
		All that was required, probably from sometime in 2002 was the requirement for every analogue device dependent on analogue TV transmissions sold in the UK or the Channel Islands to have a sticker warning that the device would need modification to be able to operate after 0630Hrs on October 1, 2009.
	forum.digitalspy.co.uk /board/showthread.php?t=136603 (3776 words)

	Royal Television Society - DTT 1: The bumpy road to analogue switch off
		Also, experience suggests that many existing aerials are only just adequate for analogue reception, and the lower power level of digital transmissions means that a new installation may be needed.
		But, with digital transmissions fitted in and around analogue, we have to face the fact that equivalent coverage to analogue can only be achieved after analogue is switched off.
		Also, the government has indicated that it wants to reclaim between 12 and 20 channels after analogue switch-off for “refarming.” So, some analogue viewers are likely to face a future without television unless they move to satellite.
	www.rts.org.uk /magazine_det.asp?id=1931&sec_id=323 (1461 words)

	Print Version (Site not responding. Last check: 2007-11-01)
		ON Semiconductor has introduced three new low resistance analogue switches for portable and wireless audio applications.
		The NLAS3799MNR2G, NLAS5223MNR2G and NLAS5123MNR2G analogue switches are designed for high-current switching of an audio signal in portable and wireless applications with low operating voltages.
		The NLAS5123MNR2G is a 1-Ω Ron, single SPDT analogue switch with 0.012 per cent total harmonic distortion and break before make capability.
	www.eetindia.com /ARTP_8800404686_1800006.HTM (466 words)

	Slow response may delay digital TV switch off - Technology - smh.com.au
		The government is carrying out six reviews into digital TV, including one on the switch off of analogue and another on allowing existing networks to offer extra channels.
		Senator Coonan told the committee the take-up of digital TV in Australia had been sluggish and she was keen to do more to encourage more people to make the switch.
		She said while the review into the planned analogue switch off was due to be finished by the end of this year, broadcasters had indicated they did not believe the 2008 switch-off date was realistic.
	smh.com.au /articles/2005/05/27/1116950826528.html (551 words)

	Tech Digest: Analogue switch off delayed
		It seems the big analogue TV switch-off is suffering from the usual delays and hiccups this country specialises in.
		Initially, all analogue signals were to be switched off by 2010 but, following discussions with the broadcasters, the decision was made to delay the change over.
		However, because the change is being made region by region, some areas may find their analogue signal goes off as early as 2007.
	www.techdigest.tv /2004/08/analogue_switch.html (256 words)

	Cable Forum: ntl and the analogue switch off
		On Thursday 15th September, according to ntl, the Government is expected to announce its plans to switch off analogue terrestrial television in the UK by 2012.
		Following the announcement, the Government will be advertising digital switchover in the national and regional press, on TV and on a dedicated website http://www.digitaluk.co.uk.
		The Government hopes that switching to digital will free up spectrum that could be used for new terrestrial services such as high definition television (HDTV) and broadcasting to mobile phones.
	www.cableforum.co.uk /article/194/ntl-and-the-analogue-switch-off (374 words)

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