instrumentation amplifier

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instrumentation amplifier

[‚in·strə·men′tā·shən ′am·plə‚fī·ər]
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 ?
Download the datasheet for the INA188 instrumentation amplifier.
The MCP6N16 Zero-Drift Instrumentation Amplifier is ideal for applications requiring high performance and precision, low power consumption, and low-voltage operation.
After studying the market about existing hardware resources like electrodes, cables, instrumental amplifiers, power amplifiers, filters and microcontrollers, we decided for Atmega 8 microcontroller, AD620A instrumentation amplifier, MAX 7426 fifth order low-pass digital filter.
1/25 the offset drift of the most competitive Bipolar instrumentation amplifier, enabling more precise measurements over temperature;
Tags / Keywords: instrumentation amplifier, in amp, op amp, operational amplifier, low power, high accuracy, low offset voltage, offset drift, gain bandwidth product, rail-to-rail, on-board calibration, mCal, CMOS, shutdown pin
The industry's first precision instrumentation amplifier designed and manufactured specifically for high temperature applications was unveiled today by Analog Devices, Inc.
The INA333 leverages our expertise in analog signal conditioning to deliver a new standard for precision, low-power instrumentation amplifiers and enable our customers to gain a competitive advantage in the market.
In addition the trimmed resistor network allows the part to be used as a low cost general purpose instrumentation amplifier.
To sense output voltage, the device includes an instrumentation amplifier which can be connected for 4-wire load connections to accurately control the voltage at remotely-located loads.
With its low-noise instrumentation amplifier, 24-bit performance and advanced features, the CS5530 is ideal for scientific measurement applications such as weigh scales, low-cost temperature controllers, digital panel meters and process control modules.
The flexible AD8222 can also be configured as a differential output instrumentation amplifier.

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