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US 9,755,507 B2Granted
Reference voltage generator having at least one bipolar junction transistor biased by negative base voltage and associated reference voltage generating method
AssigneeMediatek Inc.
InventorTa-Hsin Lin
Life of this patent
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Abstract
A reference voltage generator has a bandgap reference circuit and a negative voltage generator. The bandgap reference circuit generates a reference voltage according to at least one base-emitter voltage of at least one bipolar junction transistor. The negative voltage generator generates a negative voltage, wherein at least one base terminal of the at least one bipolar junction transistor is arranged to receive a base voltage derived from the negative voltage.
Claims18
A reference voltage generator comprising:
- a bandgap reference circuit, arranged to generate a reference voltage according to at least one base-emitter voltage of at least one bipolar junction transistor;
- a negative voltage generator, arranged to generate a negative voltage, wherein at least one base terminal of the at least one bipolar junction transistor is arranged to receive a base voltage derived from the negative voltage;
- and
- a process tracking circuit, arranged to receive the negative voltage from the negative voltage generator, receive a selected voltage from the bandgap reference circuit, and generate a process independent voltage according to the negative voltage and the selected voltage.
1 more element
A reference voltage generating method comprising:
- generating a reference voltage according to at least one base-emitter voltage of at least one bipolar junction transistor included in a bandgap reference circuit;
- generating a negative voltage;
- supplying a base voltage derived from the negative voltage to at least one base terminal of the at least one bipolar junction transistor;
- and
- generating a process independent voltage according to a selected voltage obtained from the bandgap reference circuit and the negative voltage.
2 more elements
Dependencies are inferred from the claim text.