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US 4,398,142 AGranted
Kelvin-connected buried zener voltage reference circuit
AssigneeHarris Corporation
InventorJames D. Beasom
Life of this patent
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Abstract
An improved voltage reference circuit is provided comprising a series combination of a Kelvin-connected buried zener diode and a transistor. The collector of the transistor is connected to the first anode of the diode while the base of the transistor is connected to the second anode of the diode. This connection provides compensation for temperature and voltage variations in the zener diode caused by anode parasitic resistances and external temperature changes.
Claims8
A voltage reference circuit comprising:
- a buried zener diode having first and second anodes and a cathode, said first and second anodes having inherent parasitic resistances;
- and
- a transistor having a base, collector, and emitter, said collector connected to said first anode, said base connected to said second anode, said transistor serving to compensate for voltage variations in said zener diode caused by said parasitic resistances and external temperature changes.
Dependencies are inferred from the claim text.