Zero Temperature Coefficient Diode or Reference Element
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Shown is a convenient means to provide a voltage source or reference with a zero temperature coefficient. The total voltage drop of a Schottky barrier diode (SBD) is a function of the diode drop and the drop across the diode's series resistance. The temperature coefficient (TC) of forward voltage is negative for the diode drop and positive for the series resistance. Furthermore, the diode TC becomes less negative as the current density increases. It is possible then that the two TC components could be equal in magnitude and opposite in sign, resulting in a zero temperature coefficient at specific current densities. The value of the current density at which the zero TC occurs is a function of the diode parameters (barrier height, area, epi concentration, etc.).