Metal oxide semiconductor field effect transistor (MOSFET) based voltage regulator circuit

Patent metadata

Field	Value
Publication number	US-10620651-B1
Application number	US-201916508371-A
Country	US
Kind code	B1
Filing date	Jul 11, 2019
Priority date	Jul 11, 2019
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A metal oxide semiconductor field effect transistor (MOSFET) based voltage regulator circuit includes a first resistor, a second resistor, and a first MOSFET. A first gate terminal of the first MOSFET is connected to a second terminal of the first resistor and a first terminal of the second resistor. A first drain terminal of the first MOSFET is connected to a second terminal of the second resistor and a first output terminal of the voltage regulator circuit. The first MOSFET receives an input supply voltage at the first gate terminal of the first MOSFET, via the first resistor. The first MOSFET provides a first constant output voltage at the first output terminal based on a change in the input supply voltage.

First claim

What is claimed is:

1. A voltage regulator circuit, comprising:
a first resistor;
a second resistor; and
a first Metal oxide semiconductor field effect transistor (MOSFET),
wherein a first gate terminal of the first MOSFET is connected to a second terminal of the first resistor and a first terminal of the second resistor,
wherein a first drain terminal of the first MOSFET is connected to a second terminal of the second resistor and a first output terminal of the voltage regulator circuit, and
wherein the first MOSFET is configured to:
receive an input supply voltage at the first gate terminal of the first MOSFET via the first resistor, and
provide a first constant output voltage at the first output terminal based on a change in the input supply voltage.

2. The voltage regulator circuit according to claim 1 , wherein
the first MOSFET is N-type MOSFET, and
the first MOSFET is further configured to provide a negative feedback.

3. The voltage regulator circuit according to claim 1 , wherein
a ratio of a resistance value of the first resistor and a resistance value of the second resistor is defined, and
the first MOSFET is further configured to receive the input supply voltage at the first gate terminal based on the defined ratio.

4. The voltage regulator circuit according to claim 1 , further comprising:
a second MOSFET; and
a third resistor, wherein
a second gate terminal of the second MOSFET is connected to the first output terminal of the first MOSFET and a first terminal of the third resistor, and
a second drain terminal of the second MOSFET is connected to a second terminal of the third resistor and a second output terminal of the voltage regulator circuit.

5. The voltage regulator circuit according to claim 4 , wherein a first source terminal of the first MOSFET and a second source terminal of the second MOSFET is grounded.

6. The voltage regulator circuit according to claim 4 , wherein the second MOSFET is N-type MOSFET and is configured to:
receive the first constant output voltage at the second gate terminal of the second MOSFET; and
provide a second constant output voltage at the second output terminal based on the change in the input supply voltage.

7. The voltage regulator circuit according to claim 4 , further comprising a fourth resistor connected between the first output terminal and the first terminal of the third resistor.

8. The voltage regulator circuit according to claim 4 , further comprising:
an operational amplifier;
a third MOSFET;
a fourth MOSFET; and
a fifth resistor, wherein
a negative input terminal of the operational amplifier is connected to the second output terminal of the voltage regulator circuit,
an output terminal of the operational amplifier is connected to a fourth gate terminal of the fourth MOSFET, and
a positive input terminal of the operational amplifier is connected to a third output terminal of the voltage regulator circuit, a fourth drain terminal of the fourth MOSFET and a first terminal of the fifth resistor.

9. The voltage regulator circuit according to claim 8 , wherein the third MOSFET is N-type MOSFET and the fourth MOSFET is P-type MOSFET configured to receive the input supply voltage at a fourth source terminal of the fourth MOSFET.

10. The voltage regulator circuit according to claim 8 , wherein
a third gate terminal of the third MOSFET is connected to a second terminal of the fifth resistor and a third drain terminal of the third MOSFET, and
a third source terminal of the third MOSFET is grounded.

11. The voltage regulator circuit according to claim 10 , wherein the operational amplifier is configured to:
compare a second constant output voltage at the second output terminal and a voltage reference at the third output terminal of the voltage regulator circuit; and
control generation of the voltage reference at the third output terminal of the voltage regulator circuit based on the comparison, wherein the generated voltage reference is constant based on the change in the input supply voltage.

12. The voltage regulator circuit according to claim 11 , wherein the generated voltage reference is constant based on the change in temperature around the voltage regulator circuit.

13. The voltage regulator circuit according to claim 8 , wherein the third MOSFET and the fifth resistor are connected in parallel, and wherein a third gate terminal of the third MOSFET is connected to the third output terminal of the voltage regulator circuit and the first terminal of the fifth resistor.

14. The voltage regulator circuit according to claim 13 , wherein the parallel connection between the third MOSFET and the fifth resistor is configured to provide constant output current based on the change in the input supply voltage and a change in temperature around the voltage regulator circuit.

15. A voltage regulator circuit, comprising:
a first resistor;
a second resistor; and
a first Metal oxide semiconductor field effect transistor (MOSFET), wherein
a first gate terminal of the first MOSFET is connected to a first terminal of the first resistor and a second terminal of the second resistor,
a first drain terminal of the first MOSFET is connected to a first terminal of the second resistor and a first output terminal of the voltage regulator circuit, and
the first MOSFET is configured to:
receive an input supply voltage at a first source terminal of the first MOSFET, and
provide a first constant output voltage at the first output terminal based on a change in the input supply voltage.

16. The voltage regulator circuit according to claim 15 , wherein the first MOSFET is P-type MOSFET and a second terminal of the first resistor is grounded.

17. The voltage regulator circuit according to claim 15 , further comprising:
a second MOSFET; and
a third resistor, wherein
a second gate terminal of the second MOSFET is connected to the first output terminal of the first MOSFET and a second terminal of the third resistor, and
a second drain terminal of the second MOSFET is connected to a first terminal of the third resistor and a second output terminal of the voltage regulator circuit.

18. The voltage regulator circuit according to claim 17 , wherein the second MOSFET is P-type MOSFET and is configured to:
receive the input supply voltage at a second source terminal of the second MOSFET; and
provide a second constant output voltage at the second output terminal based on the change in the input supply voltage.

19. A voltage reference generation circuit, comprising:
a voltage regulator circuit, which includes:
a first resistor,
a second resistor, and
a first Metal oxide semiconductor field effect transistor (MOSFET), wherein
a first gate terminal of the first MOSFET is connected to a second terminal of the first resistor and a first terminal of the second resistor, and
a first drain terminal of the first MOSFET is connected to a second terminal of the second resistor and a first output terminal of the voltage regulator circuit, and
the first MOSFET is configured to:
receive an input supply voltage at the first gate terminal of the first MOSFET, via the first resistor; and
provide a first constant output voltage at the first output terminal based on a change in the input supply voltage; and

an operational amplifier;
a second MOSFET;
a third MOSFET; and
a third resistor, wherein
a negative input terminal of the operational amplifier is connected to the first output terminal of the voltage regulator circuit,
an output terminal

Assignees

• Sony Corp

Inventors

• Griffiths Bernard James

Classifications

• G05F3/262

  using field-effect transistors only · CPC title

• G05F3/247

  producing a voltage or current as a predetermined function of the supply voltage · CPC title

• G05F1/575 Primary

  characterised by the feedback circuit · CPC title

• H03F1/34 Primary

  Negative-feedback-circuit arrangements with or without positive feedback (H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence {; for rejection of common mode signals H03F3/45479}) · CPC title

• H03F3/45179

  using MOSFET transistors as the active amplifying circuit (H03F3/45278 takes precedence) · CPC title