operational amplifier - Squaring Circuit

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

http://www.analog.com/en/parametricsearch/11106?doc=AD534.pdf&p0=1&lsrc=pst&doc=AD534.pdf&p0=1&lsrc=pst#/ps5=select%20all

Lowest cost is the AD633 < $5 (1k)