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W

Wener

Jan 1, 1970
0
Hello, I am now looking for an Operation Amplifer chip able to be a
voltage follower, which I need to use as a buffer between my sensor
circuit and the digitizer. Can anybody help me?

Since the output impedance of my sensor circuit is about 0.2 Gohm,
the
follower needs to have a input impedance much higher than that (Maybe
a JFET one could work).


The input signal is always sinusoidal, with an amplitude = 1~2V, and
a
variable frequency = 10KHz~1MHz, and the noise at the output is
required to be <1uV.


I tried AD712, but its bandwidth seems not enough for the 1MHz
signal.
And the AD746 showed a terrible self-excitation as being used as a
follower.


The price would not be a problem if it is lower than 50 US$.


A million thanks!
 
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