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.
Claims20
A current reference circuit, comprising:
- a power supply terminal and a ground terminal;
- a native metal oxide semiconductor field effect transistor (MOSFET) having a first native source terminal, a first native drain terminal and a first native gate terminal, in which the first native source terminal is coupled to the ground terminal;
- a diode-connected transistor having:
- a first terminal coupled to the first native drain terminal;
- a second terminal coupled to a power supply terminal;
- and
- a third terminal coupled to the first terminal;
- and
- an amplifier circuit, having:
- a first input terminal coupled to the first native drain terminal;
- and
- an output terminal coupled to the first native gate terminal.
A current reference circuit, comprising:
- a first diode-connected transistor coupled to a power supply terminal;
- a first native metal oxide semiconductor field effect transistor (MOSFET) coupled to a current output terminal of the first diode-connected transistor, and configured to initiate flow of a reference current through the first diode-connected transistor and the first native MOSFET;
- and
- an amplifier circuit coupled to the first native MOSFET and the first diode-connected transistor, and configured to generate a bias voltage at a gate terminal of the first native MOSFET based on a voltage at a drain terminal of the first native MOSFET.
A system, comprising:
- a power supply terminal and a ground terminal;
- an analog circuit;
- and
- a current reference circuit coupled to the analog circuit, and having:
- a first native metal oxide semiconductor field effect transistor (MOSFET) having a first native gate terminal, a first native source terminal and a first native drain terminal;
- a second native MOSFET having:
- a second native gate terminal coupled to the first native gate terminal;
- a second native drain terminal;
- and
- a second native source terminal coupled to a first native source terminal;
- and
- an amplifier circuit having:
- a first input coupled to a drain terminal of the first native MOSFET;
- a second input coupled to the second native drain terminal;
- and
- an output coupled to the first native gate terminal and the second native gate terminal.
Dependencies are inferred from the claim text.