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US 12,181,905 B2Granted
Low noise high precision voltage reference
AssigneeTexas Instruments Incorporated
InventorsRajat Chauhan, Divya Kaur
Life of this patent
Estimating the term…
Abstract
In described examples, a circuit includes a current mirror circuit. A first stage is coupled to the current mirror circuit. A second stage is coupled to the current mirror circuit and to the first stage. A voltage divider network is coupled to the second stage. The circuit includes an output transistor having first and second terminals, in which the first terminal of the output transistor is coupled to the first stage, and the second terminal of the output transistor is coupled to the voltage divider network.
Claims21
A circuit comprising:
- a current mirror circuit including:
- a first transistor having first, second and third terminals;
- and
- a second transistor having a first terminal, a second terminal, and a third terminal, in which the third terminal of the second transistor is coupled to the third terminal of the first transistor and to the second terminal of the second transistor;
- a first stage coupled to the second terminal of the first transistor, wherein the first stage includes:
- a third transistor having first, second and third terminals, in which the second terminal of the third transistor is coupled to the current mirror circuit;
- a fourth transistor having first, second and third terminals, in which the second terminal of the fourth transistor is coupled to the first terminal of the third transistor, and the first terminal of the fourth transistor is coupled to the third terminal of the third transistor;
- and
- a resistor having first and second ends, in which the first end is coupled to the third terminal of the third transistor and to the first terminal of the fourth transistor, and the second end is coupled to the third terminal of the fourth transistor;
- a second stage coupled to the second terminal of the second transistor and to the first stage;
- a voltage divider network coupled to the second stage;
- and
- an output transistor having first, second, and third terminals, in which the second terminal of the output transistor is coupled to the voltage divider network and the third terminal of the output transistor is coupled to the first stage.
10 more elements
A method comprising:
- generating a first reference voltage by a first stage that is coupled to a first transistor of a current mirror circuit, wherein generating the first reference voltage by the first stage includes:
- providing a power supply to the current mirror circuit;
- coupling a third transistor to the current mirror circuit;
- coupling a fourth transistor to the third transistor;
- and
- coupling a first end of a resistor to a gate of the third transistor, and coupling a second end of the resistor to a gate of the fourth transistor;
- generating a second reference voltage by a second stage that is coupled to a second transistor of the current mirror circuit and the first stage;
- generating a third reference voltage by a voltage divider network that is coupled to the second stage;
- and
- generating an output voltage by an output transistor that is coupled to the current mirror circuit, the first stage and the voltage divider network, in which the output voltage is a function of the first, second and third reference voltages.
7 more elements
A device comprising:
- a voltage reference circuit configured to provide an output voltage based on power at a battery input terminal;
- a sensor coupled to the voltage reference circuit, the sensor configured to be driven by the output voltage and to provide an analog measurement signal;
- and
- an analog to digital converter (ADC) coupled to the voltage reference circuit and to the sensor, the ADC configured to be driven by the output voltage and to convert the analog measurement signal into a digital signal;
- in which the voltage reference circuit includes:
- a current mirror circuit;
- a first stage coupled to the current mirror circuit, wherein the first stage includes a first set of transistors;
- a second stage coupled to the current mirror circuit and to the first stage, wherein the second stage includes a second set of transistors;
- a voltage divider network coupled to the second stage;
- and
- an output transistor having first and second terminals, in which the first terminal is coupled to the first stage, and the second terminal is coupled to the voltage divider network.
8 more elements
A circuit comprising:
- a current mirror circuit including:
- a first transistor having first, second and third terminals;
- a second transistor having first, second and third terminals, in which the third terminal of the second transistor is coupled to the third terminal of the first transistor;
- and
- a third transistor having first, second and third terminals, in which the third terminal of the second transistor is coupled to the third terminal of the third transistor and to the second terminal of the third transistor;
- a first stage coupled to the current mirror circuit, wherein the first stage includes:
- a fourth transistor having first, second and third terminals, in which the second terminal of the fourth transistor is coupled to the current mirror circuit;
- a fifth transistor having first, second and third terminals, in which the second terminal of the fifth transistor is coupled to the current mirror circuit, and the third terminal of the fifth transistor is coupled to the first terminal of the fourth transistor;
- a first resistor having first and second terminals, in which the first terminal is coupled to the third terminal of the fourth transistor, and the second terminal is coupled to the first terminal of the fourth transistor;
- and
- a second resistor having first and second terminals, in which the second terminal is coupled to the first terminal of the fifth transistor;
- a second stage coupled to the current mirror circuit and to the first stage;
- a voltage divider network coupled to the second stage;
- and
- an output transistor having first, second and third terminals, in which the third terminal of the output transistor is coupled to the current mirror circuit and the first stage.
12 more elements
A circuit comprising:
- a current mirror circuit including:
- a first transistor having first, second and third terminals;
- a second transistor having first, second and third terminals, in which the third terminal of the second transistor is coupled to the second terminal of the second transistor and the third terminal of the first transistor;
- and
- a first stage coupled to the current mirror circuit, wherein the first stage includes:
- a third transistor having first, second and third terminals, in which the second terminal of the third transistor is coupled to the current mirror circuit;
- and
- a first voltage divider network coupled to the first terminal of the third transistor;
- and
- a second stage coupled to the current mirror circuit and to the first stage;
- a second voltage divider network coupled to the second stage;
- and
- an output transistor having first, second and third terminals, in which the second terminal of the output transistor is coupled to the second voltage divider network, the third terminal of the output transistor is coupled to the current mirror circuit and the first stage.
10 more elements
Dependencies are inferred from the claim text.