Improvement of Temperature Coefficient of Standard Voltage by Zener Diode

In this article we discuss the principle of improvement of temperature coefficient in the standard voltage using zener diode. Usually in order to make small the temperature coefficient of “Temperature Compensated Zener Diode”, we suitably combined the zener diode with positive temperature coefficient and the silicon diode with negative temperature coefficient. But this method requires high technical skill.This article gives an easier way to make smaller the temperature coefficient. We add the third terminal between the zener diode and the silicon diode in the usual “Temperature Compensated Zener Diode”, and we can control critically the forward voltage of silicon diode to make smaller the temperature coefficient according to the following fomula dm/dv=1/THere v is the forward voltage of diode, T the ambient temperature, and m=dv/dT. Using this method we obtained the standard voltage whose temperature coefficient is 0.1ppm/deg.