Applications where in-amps may be used include:
1) data acquisition from low output transducers
2) medical instrumentation
3) current/voltage monitoring
4) audio applications involving weak audio signals or noisy environments
5) high-speed signal conditioning for video data acquisition and imaging
6) high frequency signal amplification in cable RF systems
Among many other desirable features for these applications, instrumentation amplifiers are available in types with high impedance electrically isolated inputs that present no shock hazard to the subject. Ordinary operational amplifiers are not electrically isolated.
You use a thermocouple as the input to the amplifier circuit.
Here is qn excellent article that explains step by step: http://MasteringElectronicsDesign.com/how-to-derive-the-instrumentation-amplifier-transfer-function/
Vo=(R2/R1)(V2-V1)
High Common Mode Rejection Ratio is the main feature of instrumentation amplifier! And other features are high input impedance, low output impedance, high slew rate, low power consumption, more accurate, easier gain adjustment, low thermal and time drift.
used for measurement and test equipment. its used where great accuracy and stability of circuit are required.
The differential voltage is amplified using the instrumentation amplifier.This is the inference we know from instrumentation amplifier...
A instrumentation amplifier is a special purpose linear amplifier used to amplify low level signals. These are used in many industrial and medical applications.
You use a thermocouple as the input to the amplifier circuit.
Here is qn excellent article that explains step by step: http://MasteringElectronicsDesign.com/how-to-derive-the-instrumentation-amplifier-transfer-function/
1.differential amplifier 2.operational amplifier 3.instrumentation amplifier 4.chopper amplifier 5.isolation amplier
for better amplification ...by instrumentation amplification we get the output admittance will be more
Vo=(R2/R1)(V2-V1)
An instrumentation amplifier is made out of 2 or 3 operational amplifiers.
a high common mode rejection ratio, high impedance
An op amp is made from transistors, resistors and capacitors. It is enclosed in a "chip". A basic instrumentation amp is made of 2 op-amps. you can't have a single op-amp perform as good as a instrumentation amp, although it can perfrom the same task. An i-amp has much better CMMR (common-mode rejection) and a higher input impedance.
The instrumentation amplifier provides isolation, and gain to the output of the Wheatstone Bridge. It is placed before filtering because the low output of the gauges would suffer from induced noise in the filter circuit if left unamplified.
Charles Kitchin has written: 'Instrumentation amplifier application guide'