Ultra low-voltage sub-bandgap voltage reference generator
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorChen-Hui Hsieh
Life of this patent
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Abstract
A low-voltage sub-bandgap reference circuit is disclosed. In one embodiment, the low-voltage sub-bandgap voltage reference circuit includes a differential amplifier and a first bipolar transistor with its base and collector coupled to an electrical ground. The reference circuit further includes a second bipolar transistor with base and collector coupled to the electrical ground. The reference circuit further includes a DC bias circuit supplying a predetermined voltage output between a high and low voltage terminal, the high voltage terminal being coupled to both collectors of the first and second bipolar transistors and the low voltage terminal being coupled to both bases of the first and second bipolar transistors.
Claims20
A reference voltage generating circuit, comprising:
- a first bipolar transistor having a forward biased emitter-base PN junction diode;
- and
- a DC bias circuit supplying a predetermined voltage output between a high and low voltage terminal, the high and low voltage terminal being coupled to a collector and a base of the first bipolar transistor, respectively.
A bandgap voltage reference circuit, comprising:
- a differential amplifier;
- a first bipolar transistor with an emitter coupled to a negative input terminal of the differential amplifier, a collector and a base of the first bipolar transistor being coupled to an electrical ground, thereby forming a first PN junction diode;
- a second bipolar transistor with an emitter coupled to a positive input of the differential amplifier through a first resistor, a base and a collector of the second bipolar transistor being coupled to the electrical ground thereby forming a second PN junction diode;
- a DC bias circuit supplying a predetermined voltage output between a high and low voltage terminal, the high and low voltage terminal being coupled to the collector and base of the first and second bipolar transistors, respectively;
- and
- a bandgap reference voltage output module for outputting a bandgap reference voltage.
A bandgap voltage reference circuit comprising:
- a differential amplifier;
- a first bipolar transistor with an emitter coupled to a negative input terminal of the differential amplifier, a collector and a base of the first bipolar transistor being coupled to an electrical ground thereby forming a first PN junction diode;
- a second bipolar transistor with an emitter coupled to a positive input of the differential amplifier through a first resistor, a base and a collector of the second bipolar transistor being coupled to the electrical ground, thereby forming a second PN junction diode;
- a DC bias circuit supplying a predetermined voltage output between a high and low voltage terminal, the high and low voltage terminal being coupled to the collector and base of the first and the second bipolar transistors, respectively;
- a first PMOS transistor with its drain coupled to the negative input terminal and its gate coupled to an output terminal of the differential amplifier;
- a second PMOS transistor with its drain coupled to the positive input terminal and its gate coupled to the output terminal of the differential amplifier;
- and
- a bandgap reference voltage output module for outputting a bandgap reference voltage.
A bandgap voltage reference circuit, comprising:
- a first bipolar transistor having a first emitter-base PN junction diode;
- a second bipolar transistor of the same type as the first bipolar transistor, the second bipolar transistor having a second emitter-base PN junction diode;
- a DC bias circuit supplying a predetermined voltage output between a high and low voltage terminal, the high voltage terminal being coupled to both collectors of the first and second bipolar transistors and the low voltage terminal being coupled to both bases of the first and second bipolar transistors;
- a first resistor serially coupled to the first bipolar transistor at a first node;
- and
- a second resistor serially coupled to the second bipolar transistor through a third resistor, the second and third resistors have a common second node,
- wherein the first and second resistors have approximately the same resistance and the third resistor has a predetermined resistance in proportion to the resistance of the first and second resistors.
Dependencies are inferred from the claim text.