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2_V_REFERENCE

2015-03-19 07:34  
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2_V_REFERENCE
Zener diodes that operate below the 3- or 4-V level do not perform as well as higher-voltage zeners, and are not normally used for low-voltage references. The 2-V reference uses two higher-voltage zeners, D1 and D2, to obtain a stable operating reference voltage. Any possible voltage changes from temperature variations are almost completely canceled out with the two-zener circuit, making it a more accurate reference source than a circuit with a single zener. Other low-reference -voltage sources can be created by substituting different-valued zeners for D1 and D2.