Reference voltage circuit
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorChar-Ming Huang
Life of this patent
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Abstract
A reference voltage circuit and method making same, the reference voltage circuit including: a first sub-circuit for generating first and second temperature-compensated voltages; a second sub-circuit configured to receive the first and second temperature-compensated voltages and generate first and second reference voltages based on the first and second temperature-compensated voltages, respectively; and a third sub-circuit configured to receive and change voltage levels of the first and second reference voltages, and output a third reference voltage.
Claims20
A reference circuit, comprising:
- a first sub-circuit for generating first and second temperature-compensated voltages;
- a second sub-circuit configured to receive the first and second temperature-compensated voltages and generate first and second reference voltages based on the first and second temperature-compensated voltages, respectively;
- and
- a third sub-circuit configured to receive and change voltage levels of the first and second reference voltages, and output a third reference voltage, wherein an output impedance of the first sub-circuit is higher than an input impedance of the third sub-circuit and the second sub-circuit provides a voltage buffer between the first and third sub-circuits.
A reference circuit, comprising:
- a first differential amplifier comprising first and second input terminals and a first output terminal;
- a first transistor comprising a first gate terminal coupled to the first output terminal of the first differential amplifier, a first source terminal coupled to a voltage source, and a first drain terminal coupled to the first input terminal;
- a second transistor comprising a second gate terminal coupled to the first output terminal of the first differential amplifier, a second source terminal coupled to the voltage source, and a second drain terminal coupled to the second input terminal;
- a second differential amplifier comprising a third input terminal coupled to the first drain terminal, a fourth input terminal and a second output terminal coupled to the fourth input terminal, wherein the second output terminal is configured to provide a first reference voltage;
- a third differential amplifier comprising a fifth input terminal coupled to the first input terminal of the first differential amplifier, a sixth input terminal and a third output terminal coupled to the sixth input terminal, wherein the third output terminal is configured to provide a second reference voltage;
- and
- a fourth differential amplifier comprising a seventh input terminal coupled to the second output terminal of the second differential amplifier, an eighth input terminal coupled to the third output terminal of the third differential amplifier, and a fourth output terminal coupled to the eighth input terminal, wherein the fourth output terminal is configured to output a third reference voltage.
A method of manufacturing a reference circuit, comprising:
- providing a first sub-circuit for generating first and second temperature-compensated voltages;
- coupling a second sub-circuit to the first sub-circuit, the second sub-circuit configured to receive the first and second temperature-compensated voltages and generate first and second reference voltages based on the first and second temperature-compensated voltages, respectively;
- and
- coupling a third sub-circuit to the second sub-circuit, the third sub-circuit configured to receive and change voltage levels of the first and second reference voltages to provide a third reference voltage, wherein an output impedance of the first sub-circuit is higher than an input impedance of the third sub-circuit and the second sub-circuit is configured to provide a voltage buffer between the first and third sub-circuits.
Dependencies are inferred from the claim text.