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US 4,906,863 AGranted
Wide range power supply BiCMOS band-gap reference voltage circuit
AssigneeTexas Instruments Incorporated
InventorHiep Van Tran
Life of this patent
Estimating the term…
Abstract
A BiCMOS bandgap reference voltage circuit is disclosed wherein substantial independence from a specified variation in supply voltage is accomplished through establishing a feedback loop between the output of the circuit and the input of the circuit such that the input is a function of the output.
Claims22
A band-gap reference voltage circuit comprising:
- a device capable of producing a reference current output including at least a first and second terminal wherein the bias of said first terminal controls said reference current through said second terminal;
- a band-gap reference sub-circuit operable to transmit a substantially constant reference voltage output;
- a voltage regulator device operable to maintain a substantially constant voltage at at least one selected node of said band-gap reference sub-circuit;
- and
- a current mirror coupled to said second terminal of said reference current producing device and to said band-gap reference sub-circuit, said current mirror being operable to determine the bias provided by said band-gap reference sub-circuit, said current mirror being further operable to mirror said reference current from said reference current producing device to said voltage regulator device.
2 more elements
A band-gap reference voltage circuit comprising:
- a bipolar transistor capable of producing a reference current;
- a band-gap reference sub-circuit operable to transmit a substantially constant reference voltage output;
- a voltage regulator device operable to maintain a substantially constant voltage at at least one selected node of said band-gap reference sub-circuit;
- and
- a current mirror coupled to both said bipolar transistor and said band-gap reference sub-circuit, said current mirror being operable to mirror said reference current from said bipolar transistor to said voltage regulator device.
2 more elements
A band-gap reference voltage circuit comprising:
- a device capable of producing a substantially constant reference current;
- a band-gap reference sub-circuit coupled to said reference current device, operable to transmit a substantially constant reference voltage output;
- a voltage regulator device;
- and
- a current mirror being operable to mirror said reference current from said reference current producing device to said voltage regulator device.
2 more elements
A band-gap reference voltage circuit comprising:
- a bipolar transistor capable of producing a substantially constant reference current;
- a band-gap reference sub-circuit coupled to said bipolar transistor, operable to transmit a substantially constant reference voltage output;
- a voltage regulator device;
- a current mirror comprising first and second field-effect transistors, said field effect transistors sharing common gate connections and said first field effect transistor having its drain connected to its gate, said current mirror being operable to mirror said reference current from said reference current producing bipolar transistor to said voltage regulator device.
1 more element
A method for providing a reference voltage which is substantially independent of power supply variations comprising the steps of:
- producing a reference voltage;
- producing a reference current derived from said reference voltage;
- and
- mirroring said reference current so as to control the production of said reference voltage, said control resulting in a substantially constant reference voltage.
1 more element
Dependencies are inferred from the claim text.