I have to study biomedical electronic, but there is a problem. I searched but could not find things I want.
How can I design squaring circuit with op-amp, if input is a 50 mV and I have to get output value = X^2. = 2500 mV for example?
Answer
Because of the difficulty in calibration of a true Analog multiplier, it is best to consider the use of a suitable chip with factory laser trimmed offset and gain IC, such as ;
www.analog.com/media/en/technical-documentation/data-sheets/AD534.pdf
There is a wide selection range and many suppliers, AD835 AD633 AD734 AD834 AD538 AD539 AD632 AD534 AD532
Lowest cost is the AD633 < $5 (1k) 
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