>I have an analog signal source vary from -40mv to +1100mv, and I want to
swift entire range from 0mv to 1400mv. It can be easily done by adding 40mv
>by simple math. Yet, if I want to add the offset using some hardware, how
can I do it? The signal that will eventually go through an op-amp (LM324)and
the op-amp may have a gain of 3.57 to bump it up to a range of 0 to 5volt
and feed it to Analog to Digital.

You can do this with an Op Amp adder circuit. You sum a 40mv reference with
the input signal using two input resistors to the same node of the same
value. Most data books show a simple summing amp circuit that will do what
you need.

Larry
Larry G. Nelson Sr.
L.Nelson@ieee.org
http://www.ultranet.com/~nr