AVR-Chat

I think that the amplifiers from Texas Instruments can do what you want ,they have a very big collection of amps of different bandwidths...for more info see digikey catalog

Doug Locke <doug@whiteapple.u-net.com> wrote:        Thanks Russell
Anything with a bandwidth up to say a Mhz would be fine for this. I was
rather thinking along the lines of obtaining something general where I had
no need to worry about design for now and that would also be an asset for
future work. Once I have established the feasability and best approach is
the time to look at a specific input circuit.

Regards.
Doug.
-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com]On Behalf
Of Russell Shaw
Sent: 16 August 2006 01:52
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] General purpose amplifier to use with AVR

Doug Locke wrote:
> I wonder if someone could help me with some advice please. I am trying
> to use an AVR microcontroller to monitor an analogue signal. The
> signal is both very low and of high impedance, so initially I wish to
> experiment a little by using a general purpose amplifier between the
> source and the AVR. I have found a HP 465A or a Brookdeal 9452 for not
> too much cash. Does anyone have any experience with either instrument,
> the HP has fixed gains of 20db or 40db while the Brookdeal is
> apparently variable 30-100db so either has suitable gain.
> Thanks for your time.
> Doug Locke.

An important thing to specify is the signal bandwidth, or what the source
of the signal is. If you're "monitoring" the signal with a digital input,
you just need a comparator and simple RC filter. For an ADC input, an
opamp
amplifier and some RFI filtering will do.

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