Abstract
The difference between the op-amp and the instrumentation amps (in-amps) is the fact that, usually, the input of an op-amp is configured for single ended (non-symmetrical, un-balanced) purposes and the in-amp is configured as an amp with a true differential (symmetrical, balanced) input. However, both types of amps can be configured the opposite way – but coming along with certain disadvantages. In addition, in most IC cases, the in-amp’s gain can be set by only one resistor whereas the op-amp’s gain can be set by a range of different possibilities.
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Notes
- 1.
M/C Chap. 10.
- 2.
Analog Devices SSM2017 data sheet, Audio Video Reference Manual 1992.
- 3.
Created with (4.50) and the approach to get SN that is described by (7.46), (7.47): solid traces = floating input load − dotted traces = grounded input load.
- 4.
Data sheet Analog Devices.
- 5.
Data sheet Texas Instruments (Burr-Brown).
- 6.
According to the INA103 data sheet comments it makes no sense to use these outputs for any equalizing purpose nor to try to decrease drastically the feedback resistors R1 and R2.
- 7.
Draft based on an Elektor Electronics design in issue 03-1991.
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© 2011 Springer-Verlag Berlin Heidelberg
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Vogel, B. (2011). Noise in Instrumentation Amps. In: The Sound of Silence. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19774-1_9
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DOI: https://doi.org/10.1007/978-3-642-19774-1_9
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