Re: how to raise input impedance of small signal
- From: John Popelish <jpopelish@xxxxxxxx>
- Date: Sun, 04 Sep 2005 22:59:48 -0400
eehinjor wrote:
Hi,everybody. The voltage of my signal is of mv level.this signal is the input of ADCs.I want to raise the input impdedance of the signal,then the signal will be isolated from the ADCs.
Simplely,An op-amp(OPA602) is used.
the signal---PIN3(IN+) PIN2(IN-)--PIN5(OUT)
but I found the result is so bad.Such as,when the signal is about 2.5mV,the output of op-amp is almost 3.3mV.
Who know the reason and better ways?
Best regards.
How do you know the signal is 2.5 mV when it is connected to the opamp? .
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