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Subject: Re: Charge amplifier schematics

Date: 05/17/01 at 2:24 AM
Posted by: Dominique
E-mail: dbov@vibro-meter.ch
Message Posted:

In Reply to: Charge amplifier schematics posted by Brian Lahausse on 04/16/01 at 2:40 AM:

Hi,
you might use an INA116 from burr-brown, which is a
very low bias current (10^-15 A) instrumentation
amplifier.
Go to the texas instruments web site as they have
recently bought Burr-brown.
Take care with ESD as ANY errand charge may blow
it up: the signal must be input with a VERY good
shielded cable, like dual-shielded twisted pair
Take also care with the charge (picocoulomb, pC)
signal: the cable must be teflon isolated because
any variation of the capacitance of the cable, under
mechanical vibration for example, will translate to
a pC parasitic signal.
Hope it helps,
Domionique


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