Bandgap voltage reference circuit
Patent 5053640 Issued on October 1, 1991. Estimated Expiration Date: 
October 25, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 25, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLoop length compensation circuit Voltage-temperature compensated threshold for hysteresis line receiver at TTL supply voltage NPN band gap voltage reference Band gap circuit Bandgap reference circuit having higher-order temperature compensation Curvature correction of bipolar bandgap references Patent #: 4808908 InventorAssigneeApplicationNo. 427173 filed on 10/25/1989US Classes:327/539, Using bandgap323/313, To derive a voltage reference (e.g., band gap regulator)323/314, With additional stage327/513With compensation for temperature fluctuationsExaminersPrimary: Miller, Stanley D.Assistant: Roseen, Richard Attorney, Agent or FirmInternational ClassesH03K 003/01H03K 003/26 AbstractA voltage reference circuit employs a bandgap cell to establish a voltage reference, stabilized relative to the bandgap voltage of silicon, and a compensation circuit for compensating non-linear temperature dependence of the bandgap stabilized voltage reference. A two or three transistor type bandgap cell may be employed to establish the bandgap reference voltage along with a voltage divider network to adjust the output reference voltage relative to the bandgap voltage of silicon. The compensation circuit preferably employs a compensation resistor in the resistor divider network, and a switching circuit for switching current therethrough. This provides empirically determined adjustments to the output reference voltage by switching current through the compensation resistor in accordance with predetermined temperature thresholds.Other References
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