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Differential Amplifier Schematics

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Difference Amplifier uses Digital Potentiometers

Difference Amplifier uses Digital Potentiometers

You sometimes need to measure a small signal in the presence of a large common-mode signal. Traditional instrumentation amplifiers that use two or three op amps in their internal structure find common use in these applications.

http://www.edn.com/article/CA217667.html

Differential Amp Needs No Power Source

Differential Amp Needs No Power Source

A true-differential, power-source-free, high-input-impedance amplifier with bipolar output would present distinct advantages in remote devices. Such an amplifier, with its bipolar output, would be a better choice than a unipolar,4- to20-mA device.

http://www.edn.com/article/CA213408.html

Fully Differential Input Voltage Amplifier

Fully Differential Input Voltage Amplifier

National Semiconductor Application Notes.

http://www.national.com/ms/LB/LB-20.pdf