instrumentation amplifier


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instrumentation amplifier

[‚in·strə·men′tā·shən ′am·plə‚fī·ər]
(electronics)
An amplifier that accepts a voltage signal as an input and produces a linearly scaled version of this signal at the output; it is a closed-loop fixed-gain amplifier, usually differential, and has high input impedance, low drift, and high common-mode rejection over a wide range of frequencies.

Instrumentation amplifier

A special-purpose linear amplifier, used for the accurate amplification of the difference between two (often small) voltages, often in the presence of much larger common-mode voltages, and having a pair of differential (usually high-impedance) input terminals, connected to sources Vin1 and Vin2; a well-defined differential-mode gain ADM; and a voltage output Vout, satisfying the relationship given in the equation below. It

differs from an operational amplifier (op-amp), which ideally has infinite open-loop gain and must be used in conjunction with external elements to define the closed-loop transfer function. At one time built in discrete or hybrid form using operational amplifier and resistor networks, instrumentation amplifiers are readily available as inexpensive monolithic integrated circuits. Typical commercial amplifiers provide present gains of 1, 10, 100, and 1000. In some cases, the gain may be set to a special value by one or more external resistors. The frequency response invariably is flat, extending from 0 (dc) to an upper frequency of about 1 kHz to 1 MHz. See Integrated circuits, Operational amplifier

Instrumentation amplifiers are used to interface low-level devices, such as strain gages, pressure transducers, and Hall-effect magnetic sensors, into a subsequent high-level process, such as analog-to-digital conversion. See Amplifier, Differential amplifier, Pressure transducer, Strain gage

References in periodicals archive ?
Instrumentation amplifier possesses unique properties like Low dc offset, high CMRR, High gain and compact size, also providing accuracy and stability required for the amplification process.
The quality of the signal is good, due to digital noise filter, shielded cable, and low noise instrumentation amplifier and low noise power amplifier we used.
The AD8220 and AD8224 JFET input instrumentation amplifiers offer input bias current under 20 pA.
Intersil said that the ISL28470 instrumentation amplifier, part of the company's new pinPOINT precision analog product line, delivers accuracy with an industry-leading maximum offset voltage of +/-150 microvolts and typical CMMR (common mode rejection ratio) of 110 dB.
1 Hz to 10 Hz of any other Bipolar instrumentation amplifier, providing precise measurements over the entire input range;
Unlike the topologies employed in many of today's integrated solutions, the highly flexible analog filtering configuration of the AD8232 incorporates a two-pole, high-pass filter that is tightly coupled with the IC's instrumentation amplifier architecture, and an uncommitted operational (gain) amplifier that enables the user to employ multi-pole low pass filtering techniques to remove line noise and other interference.
Tenders are invited for Purchase of 12 EA of force plate, 12 EA of rotary motion sensor, 12 EA of rotary motion motor kit, 12 EA of rotational motion accessory kit, 12 EA of instrumentation amplifier, see attached file.
ADI) today introduced an ultra-low noise, low-power low-distortion instrumentation amplifier (in amp) for the precision measurement of extremely small signals present in noisy industrial operating environments.
The AD627 is an integrated, micropower instrumentation amplifier that delivers rail-to-rail output swing.
The AAF-3PCI is a signal conditioning instrumentation amplifier and filter card.
Exar's award winning XR10910 Sensor Interface offers an onboard 16:1 differential multiplexer, offset correction DAC, programmable gain instrumentation amplifier and voltage reference.
An instrumentation amplifier configuration is ideal for this type of situation, in which the amplifier will cancel any signal common to the differential inputs (either from the electrodes or any common mode noise such as 60 Hz interference), while amplifying the cardiac signal of interest.

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