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From: abali@parts.eng.ohio-state.edu (Bulent Abali)
Newsgroups: sci.electronics
Subject: Re: buffer amp
Keywords: buffer impedance
Message-ID: <3044@quanta.eng.ohio-state.edu>
Date: 15 Sep 89 18:41:25 GMT
References: <2596@husc6.harvard.edu> <11131@fluke.COM>
Sender: news@quanta.eng.ohio-state.edu
Reply-To: abali@parts.eng.ohio-state.edu (Bulent Abali)
Organization: Ohio State Univ, College of Engineering
Lines: 20

In article <11131@fluke.COM> strong@tc.fluke.COM (Norm Strong) writes:
>In article <2596@husc6.harvard.edu> kiely@lownlab.harvard.edu (James P. Kiely) writes:
>}I am looking for an IC or circuit with the following characteristics:
>}        - high impedance single ended input ( >= 1 Gigohm )
> ...........
>}Application - EEG (electroencephalogram - brain waves) amplifier.
>
>Your required bandwidth and noise level are not possible at the present
>state-of-the-art,....
>Norm   (strong@tc.fluke.com)

There is an interesting article titled "Biomagnetism ..." on detecting 
brain waves in the latest issue of Science vol.245 pp.1041-1043.
Superconducting Interference Devices (SQUID) were used for detecting 
weak magnetic fields such as brain waves.

-=-
Bulent Abali                               : abali@baloo.eng.ohio-state.edu
Ohio State Univ., Dept. of Electrical Eng. : Phone: (614)292-2452
2015 Neil Ave. Columbus, Ohio 43210        :