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US 10,884,446 B2Granted
Current reference circuit
AssigneeTexas Instruments Incorporated
InventorAvinash Shreepathi Bhat
Life of this patent
Estimating the term…
Abstract
A current reference circuit includes a native metal oxide semiconductor field effect transistor (MOSFET). The native MOSFET includes a source terminal coupled to ground. The current reference circuit also includes a transistor and an amplifier circuit. The transistor includes a first terminal coupled to a drain terminal of the native MOSFET, a second terminal coupled to a power supply rail, and a third terminal coupled to the drain terminal of the native MOSFET. The amplifier circuit includes an input terminal coupled to the drain terminal of the native MOSFET, and an output terminal coupled to a gate terminal of the native MOSFET.
Claims15
A current reference circuit, comprising:
- a power supply terminal and a ground terminal;
- a first resistor having one terminal connected to the power supply terminal and having another terminal;
- a first transistor having a first terminal connected to the another terminal of the resistor, having a second terminal, having a control terminal connected to the second terminal of the first transistor, and having a first, standard threshold voltage;
- a second transistor having a first terminal connected to the power supply terminal, having a second terminal, having a control terminal connected to the second terminal of the second transistor, and having a second, standard threshold voltage, the second transistor being N times larger than the first transistor;
- an amplifier circuit having a non-inverting input connected to the second terminal of the first transistor, having an inverting input connected to the second terminal of the second transistor, and having an amplifier output;
- a third transistor having a first terminal connected to the second terminal of the first transistor, having a second terminal, and having a control terminal connected the amplifier output, the third transistor having a third threshold voltage lower than the standard threshold voltage;
- a fourth transistor having a first terminal connected to the second terminal of the second transistor, having a second terminal coupled to the second terminal of the third transistor, and having a control terminal connected to the amplifier output, the fourth transistor having a fourth threshold voltage lower than the standard threshold voltage;
- and
- a second resistor having one terminal connected to the second terminals of the third and fourth transistors and having another terminal connected to the ground terminal.
6 more elements
A current reference circuit comprising:
- a power supply terminal and a ground terminal;
- a first resistor having one terminal connected to the power supply terminal and having another terminal;
- a first transistor having a first terminal connected to the another terminal, having a control terminal connected to the first terminal of the first transistor, having a second terminal, and having a low threshold voltage;
- a second transistor having a first terminal connected to the power supply terminal, having a control terminal connected to the first terminal of the second transistor, having a second terminal, and having a standard threshold voltage;
- a third transistor having a first terminal connected to the second terminal of the first transistor, having a second terminal, and having a control terminal, the third transistor having a threshold voltage lower than the standard threshold voltage;
- a fourth transistor having a first terminal connected to the second terminal of the second transistor, having a second terminal coupled to the second terminal of the third transistor, and having a control terminal connected to control terminal of the third transistor, the fourth transistor having a threshold voltage lower than the standard threshold voltage;
- a second resistor having one terminal connected to the second terminals of the third and fourth transistors and having another terminal connected to the ground terminal;
- a first capacitor having one terminal connected to the control terminals of the third and fourth transistors and having another terminal connected to the ground terminal;
- a third resistor having one terminal connected to the power supply terminal and having another terminal;
- a first amplifier transistor having a first terminal connected to the another terminal of the third resistor, having a control terminal connected to the another terminal of the first resistor, and having a second terminal;
- a second amplifier transistor having a first terminal connected to the another terminal of the third resistor, having a control terminal connected to the power supply terminal, and having a second terminal connected to the control terminals of the third and fourth transistors;
- a third amplifier transistor having a first terminal connected to the second terminal of the first amplifier transistor, having a control terminal connected to the second terminal of the first amplifier transistor, and having a second terminal connected to the ground terminal;
- and
- a fourth amplifier transistor having a first terminal connected to the second terminal of the second amplifier transistor, having a control terminal connected to the control terminal of the third amplifier transistor, and having a second terminal connected to the ground terminal.
11 more elements
Dependencies are inferred from the claim text.