Talk:Electronics/Analog multipliers

On drawings, va should be on the output of 3rd op-amp, that is on the anode side, left side, of diode. Cathode side, right side, is on virtual 0 V. DarkoS (discuss • contribs) 14:22, 11 March 2014 (UTC)

The author says "MOS are symmetrical devices, so we could replace the drain with the source without affecting the behavior of the device." but this is an over generalization. Many discrete mosfets have a body source-drain diode. They are definitely not symetrical. 192.146.101.24 (discuss) 20:49, 25 March 2014 (UTC)

There is a complete misconception here as to the role of Vt. Vt is called the "temperature voltage" at room temperature and it is 26mV. Vt = kT/q where k is Boltzmann's Constant, T is the temperature of the diode in degrees absolute and q is the charge carried by an electron. You can Google k, T & Q. Also, for a real diode (as opposed to an ideal diode), Vt needs to be multiplied by a factor n, the emission coefficient, where n lies between 1 and 2 (1 0 and V1 < 0. Or maybe a bleeding resistor from negative supply must be introduced.