Instrumentation Amplifier Calculator

Instrumentation Amplifier

A precision amplifier circuit intended to reject common-mode noise and precisely amplify small differential signals is called an instrumentation amplifier.
It usually has a differential amplifier design with three operational amplifiers and precision resistors arranged to provide low output impedance, high common-mode rejection ratio (CMRR), and high input impedance.

An instrumentation amplifier’s main function is to attenuate noise and common-mode signals while amplifying weak differential signals coming from sensors, transducers, or other sources.
It offers accurate signal conditioning and amplification, making it possible to measure and process small electrical signals precisely in a variety of instrumentation and measurement systems.

Understanding Instrumentation Amplifier:

Here are some key aspects of instrumentation amplifiers:

High input impedance

Instrumentation amplifiers boast high input impedance, enabling them to amplify weak signals without imposing a load on the source.

Low output impedance: The output impedance of an instrumentation amplifier is typically low, rendering it well-suited for driving a diverse array of loads.

High common-mode rejection ratio (CMRR):

Instrumentation amplifiers feature a high Common-Mode Rejection Ratio (CMRR), enabling them to effectively reject signals common to both inputs, such as noise and interference.

Low self-generated noise:Instrumentation amplifiers typically exhibit low self-generated noise, rendering them suitable for applications where noise is a critical concern.

Low offset drift:

Instrumentation amplifiers are characterized by a low offset drift, ensuring that their output voltage remains stable despite variations in time and temperature.

Gain adjustment

The gain of an instrumentation amplifier can be adjusted by varying a single resistor, simplifying the customization of the amplifier for specific applications.

Some common types of instrumentation amplifiers include:

Three-op-amp instrumentation amplifier: This represents the most prevalent type of instrumentation amplifier, employing three operational amplifiers to amplify the disparity between two input signals.

Two-op-amp instrumentation amplifier: This type of instrumentation amplifier utilizes two operational amplifiers to amplify the difference between two input signals. However, it necessitates a higher gain to attain an equivalent level of amplification compared to a three-op-amp amplifier.

Chopper-stabilized instrumentation amplifier: This type of instrumentation amplifier employs a switching-input frontend to eliminate DC offset errors and drift.

Feedback-free instrumentation amplifier: This type of instrumentation amplifier utilizes a high-input-impedance differential amplifier engineered without an external feedback network, enabling reduced noise and enhanced bandwidth.

APPLICATIONS:-

  • Sensor Signal Conditioning
  • Data Acquisition Systems
  • Medical Instruments
  • Bridge Circuits
  • Signal Processing and Control

Using the supplied voltages and variable resistors, this online electrical calculator helps determine the output voltage of an instrumentation amplifier (Amp). It helps with the analysis and design of instrumentation amplifier circuits by enabling you to compute the desired output voltage by entering the necessary numbers.

Note : Don’t end with comma ( , )

Voltage (V1)
volts
Voltage (V2)
volts
Resistor (R1)
Ohms
Resistor (R2)
Ohms
Resistor (R3)
Ohms
Resistor Gain (Rg)
Ohms

Formula

\[Vo=(V2−V1)⋅\left(1+ \frac{2⋅R1}{Rg} \right)⋅\frac{R3}{R2}\]

where,

  • Vo = Output Voltage on Amp
  • Rg = Resistor Gain

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