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From: kiely@lownlab.harvard.edu (James P. Kiely)
Newsgroups: sci.electronics
Subject: buffer amp
Summary: need hi-zi single ended --> low-z balanced buffer amp
Keywords: buffer impedance
Message-ID: <2596@husc6.harvard.edu>
Date: 12 Sep 89 15:42:57 GMT
Sender: news@husc6.harvard.edu
Reply-To: kiely@lownlab.harvard.edu (James P. Kiely)
Organization: Lown Cardiovascular Laboratory, Harvard University
Lines: 19

I am looking for an IC or circuit with the following characteristics:
        - high impedance single ended input ( >= 1 Gigohm )
                (differential with one input grounded should be ok)
        - low impedance balanced output ( <= 50 ohms) (to drive twisted pair)
        - SNR of at least 98 db
	- equivalent input noise <= 0.05 microvolts
        - gain of 1
        - high frequency cutoff 10 KHz or higher
        - any other spec's necessary to make the circuit usable as a front
                end to a true 16 bit data acquisition system
I would like this all in one inexpensive IC if possible.
If not a simple inexpensive circuit will do.
Application - EEG (electroencephalogram - brain waves) amplifier.

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NAME:     James P. Kiely                USPS:   Kiely Laboratories
USENET:   ...!harvard!lownlab!kiely             P.O. Box 624
DOMAIN:   kiely@lownlab.harvard.edu             Allston, MA 02134-0624
PHONE:    +1 617 782 4136                       USA