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In article <8alm5q$g85$1@copland.udel.edu>,
Ron Dozier <dozier@copland.udel.edu> wrote:
)In article <89smse$fkl$1@news.cz.js.cn>, peter <asdc@bigfoot.com> wrote:
)>Hi,can anyone tell me what's the general difference between
)>instrumental amplifier and operational amplifier? what kind
)>of application does each amplifier designed for?what kind of behaviors or
)>characters we could expect when using them in application
)>
)
)I'll tak a stab at this question.  An instrumentation amp geneally
)amplifies the differnece between it's inputs in the presence of a large
)common mode signal. They may have an extremely low bandwith. 

This is good. 

)
)An operational amplifier on the other hand is a general purpose building
)block and is single ended.

This is wrong.

)A typical use for an IA is thermocouple signal conditioning or bridge
)amplifier and data acquisition where ground loops are a problem.
)>
)
)Ron
)


The difference between an op-amp and an instrumentation amp is quite
simple: an instrumentation amp is an optimized op-amp. It is normally
built out of more than one op amp. It provides

	low leakage
	low offset
	low drift (with temperature and time)
	high common-mode rejection

That's about it.
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