Data Portal @ linkeddatafragments.org

Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Instrumentation_amplifier> ?p ?o. }

• Instrumentation_amplifier abstract "An instrumentation (or instrumentational) amplifier is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. Additional characteristics include very low DC offset, low drift, low noise, very high open-loop gain, very high common-mode rejection ratio, and very high input impedances. Instrumentation amplifiers are used where great accuracy and stability of the circuit both short and long-term are required.Although the instrumentation amplifier is usually shown schematically identical to a standard operational amplifier (op-amp), the electronic instrumentation amp is almost always internally composed of 3 op-amps. These are arranged so that there is one op-amp to buffer each input (+,−), and one to produce the desired output with adequate impedance matching for the function.The most commonly used instrumentation amplifier circuit is shown in the figure. The gain of the circuit isThe rightmost amplifier, along with the resistors labelled and is just the standard differential amplifier circuit, with gain = and differential input resistance = 2·. The two amplifiers on the left are the buffers. With removed (open circuited), they are simple unity gain buffers; the circuit will work in that state, with gain simply equal to and high input impedance because of the buffers. The buffer gain could be increased by putting resistors between the buffer inverting inputs and ground to shunt away some of the negative feedback; however, the single resistor between the two inverting inputs is a much more elegant method: it increases the differential-mode gain of the buffer pair while leaving the common-mode gain equal to 1. This increases the common-mode rejection ratio (CMRR) of the circuit and also enables the buffers to handle much larger common-mode signals without clipping than would be the case if they were separate and had the same gain.Another benefit of the method is that it boosts the gain using a single resistor rather than a pair, thus avoiding a resistor-matching problem (although the two s need to be matched), and very conveniently allowing the gain of the circuit to be changed by changing the value of a single resistor. A set of switch-selectable resistors or even a potentiometer can be used for , providing easy changes to the gain of the circuit, without the complexity of having to switch matched pairs of resistors.The ideal common-mode gain of an instrumentation amplifier is zero. In the circuit shown, common-mode gain is caused by mismatches in the values of the equally numbered resistors and by the mis-match in common mode gains of the two input op-amps. Obtaining very closely matched resistors is a significant difficulty in fabricating these circuits, as is optimizing the common mode performance of the input op-amps.An instrumentation amp can also be built with two op-amps to save on cost and increase CMRR, but the gain must be higher than two (+6 dB).Instrumentation amplifiers can be built with individual op-amps and precision resistors, but are also available in integrated circuit form from several manufacturers (including Texas Instruments, National Semiconductor, Analog Devices, Linear Technology and Maxim Integrated Products). An IC instrumentation amplifier typically contains closely matched laser-trimmed resistors, and therefore offers excellent common-mode rejection. Examples include AD8221, MAX4194, LT1167 and INA128.Instrumentation Amplifiers can also be designed using "Indirect Current-feedback Architecture", which extend the operating range of these amplifiers to the negative power supply rail, and in some cases the positive power supply rail. This can be particularly useful in single-supply systems, where the negative power rail is simply the circuit ground (GND). Examples of parts utilizing this architecture are MAX4208/MAX4209 and AD8129/AD8130.Feedback-free instrumentation amplifier is the high input impedance differential amplifier designed without the external feedback network. This allows reduction in the number of amplifiers (one instead of three), reduced noise (no thermal noise is brought on by the feedback resistors) and increased bandwidth (no frequency compensation is needed). Chopper stabilized (or zero drift) instrumentation amplifiers such as the LTC2053 use a switching input front end to eliminate DC offset errors and drift.".
• Instrumentation_amplifier thumbnail Op-Amp_Instrumentation_Amplifier.svg?width=300.
• Instrumentation_amplifier wikiPageExternalLink j.cryogenics.2008.12.014.
• Instrumentation_amplifier wikiPageExternalLink ina128.html.
• Instrumentation_amplifier wikiPageExternalLink xtocid154899.
• Instrumentation_amplifier wikiPageExternalLink 10.html.
• Instrumentation_amplifier wikiPageExternalLink designersGuide.html.
• Instrumentation_amplifier wikiPageExternalLink product.html.
• Instrumentation_amplifier wikiPageExternalLink product.html.
• Instrumentation_amplifier wikiPageExternalLink 25406877Common.pdf.
• Instrumentation_amplifier wikiPageExternalLink instamp1.htm.
• Instrumentation_amplifier wikiPageExternalLink Instrumentation.htm.
• Instrumentation_amplifier wikiPageExternalLink 1167.
• Instrumentation_amplifier wikiPageExternalLink LTC2053.
• Instrumentation_amplifier wikiPageExternalLink instrumentation_amplifiers.
• Instrumentation_amplifier wikiPageExternalLink 4034.
• Instrumentation_amplifier wikiPageExternalLink 2006.
• Instrumentation_amplifier wikiPageExternalLink 4925.
• Instrumentation_amplifier wikiPageExternalLink Instrumentation.
• Instrumentation_amplifier wikiPageID "320233".
• Instrumentation_amplifier wikiPageRevisionID "601807759".
• Instrumentation_amplifier hasPhotoCollection Instrumentation_amplifier.
• Instrumentation_amplifier subject Category:Electronic_amplifiers.
• Instrumentation_amplifier type Amplifier102705944.
• Instrumentation_amplifier type Artifact100021939.
• Instrumentation_amplifier type ElectronicAmplifiers.
• Instrumentation_amplifier type ElectronicEquipment103278248.
• Instrumentation_amplifier type Equipment103294048.
• Instrumentation_amplifier type Instrumentality103575240.
• Instrumentation_amplifier type Object100002684.
• Instrumentation_amplifier type PhysicalEntity100001930.
• Instrumentation_amplifier type Whole100003553.
• Instrumentation_amplifier comment "An instrumentation (or instrumentational) amplifier is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. Additional characteristics include very low DC offset, low drift, low noise, very high open-loop gain, very high common-mode rejection ratio, and very high input impedances.".
• Instrumentation_amplifier label "Amplificador de instrumentación".
• Instrumentation_amplifier label "Amplificateur de mesure".
• Instrumentation_amplifier label "Amplificatore da strumentazione".
• Instrumentation_amplifier label "Instrumentation amplifier".
• Instrumentation_amplifier label "Instrumentenverstärker".
• Instrumentation_amplifier label "Измерительный усилитель".
• Instrumentation_amplifier label "儀表放大器".
• Instrumentation_amplifier sameAs Instrumentenverstärker.
• Instrumentation_amplifier sameAs Amplificador_de_instrumentación.
• Instrumentation_amplifier sameAs Instrumentazioko_anplifikadore.
• Instrumentation_amplifier sameAs Amplificateur_de_mesure.
• Instrumentation_amplifier sameAs Amplificatore_da_strumentazione.
• Instrumentation_amplifier sameAs m.01vdzk.
• Instrumentation_amplifier sameAs Q1523756.
• Instrumentation_amplifier sameAs Q1523756.
• Instrumentation_amplifier sameAs Instrumentation_amplifier.
• Instrumentation_amplifier wasDerivedFrom Instrumentation_amplifier?oldid=601807759.
• Instrumentation_amplifier depiction Op-Amp_Instrumentation_Amplifier.svg.
• Instrumentation_amplifier isPrimaryTopicOf Instrumentation_amplifier.