# US 2014/0152288 A1 · Reference Voltage Generator and Corresponding Integrated Circuit

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- Number: US 2014/0152288 A1
- Document ID: US20140152288A1
- Status: Published application
- Kind: A1
- Application number: 14/097,091
- Filed: 2013-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: iWatt Integrated Circuits Technology (Tianjin) Limited
- Applicants: iWatt Integrated Circuits Technology (Tianjin) Limited
- Inventors: Zhenyu Song; Junyue Sun
- Web page: https://patentgrep.com/patent/US20140152288A1

## CPC

- G05F 3/185: {and field-effect transistors}
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

## Abstract

The present invention provides a reference voltage generator and a corresponding integrated circuit. The reference voltage generator comprises: a current mirror connected between an input voltage and ground and comprising a source current branch and a mirror current branch; a resistive element connected in series in the source current branch; and a voltage stabilizing element connected in series in the mirror current branch, wherein the mirror current generated in the mirror current branch is operable to meet working current requirements of the voltage stabilizing element, and one terminal of the voltage stabilizing element serves as a reference voltage output terminal Regarding application of an input voltage having a larger change scope, embodiments of the present invention provide a current having a smaller change scope and a lower power consumption so as to facilitate operation of high-voltage and low-power consumption integrated circuit, and particularly exhibit advantages in applications requiring a smaller current during a standby period.

## Claims

### Claim 1

A reference voltage generator, comprising:
a current mirror connected between an input voltage and ground and comprising a source current branch and a mirror current branch;
a resistive element connected in series in the source current branch; and
a voltage stabilizing element connected in series in the mirror current branch, wherein the mirror current generated in the mirror current branch is operable to meet working current requirements of the voltage stabilizing element, and one terminal of the voltage stabilizing element serves as a reference voltage output terminal.

### Claim 2 (depends on 1)

The reference voltage generator according to claim 1, wherein the current mirror comprises a first transistor connected in the source current branch and a second transistor connected in the mirror current branch.

### Claim 3 (depends on 2)

The reference voltage generator according to claim 2, wherein the first transistor and the second transistor both are PMOS transistors, a source of the first PMOS transistor and a source of the second PMOS transistor being connected to the input voltage, a gate of the first PMOS transistor and a gate of the second PMOS transistor being connected together, the gate and a drain of the first PMOS transistor being connected, one terminal of the resistive element being connected to the drain of the first PMOS transistor and the other terminal of the resistive element is grounded, one terminal of the voltage stabilizing element being connected to a drain of the second PMOS transistor and the other terminal of the voltage stabilizing element is grounded.

### Claim 4 (depends on 2, 3)

The reference voltage generator according to claim 2 or 3, wherein a width of the second PMOS transistor is one to ten times a width of the first PMOS transistor.

### Claim 5 (depends on 1, 2, 3)

The reference voltage generator according to any of claims 1 to 3, wherein the resistive element comprises a resistor or an NMOS transistor.

### Claim 6 (depends on 1, 2, 3)

The reference voltage generator according to any of claims 1 to 3, wherein the voltage stabilizing element comprises a zener or a diode.

### Claim 7 (depends on 1, 2, 3)

The reference voltage generator according to any of claims 1 to 3, further comprising an amplifying circuit wherein an input terminal of the amplifying circuit is connected to said one terminal of the voltage stabilizing element and an output terminal of the amplifying circuit serves as the reference voltage output terminal

### Claim 8 (depends on 7)

The reference voltage generator according to claim 7, wherein the input voltage is any predetermined value in a range between 7V and 100V.

### Claim 9 (depends on 1, 2, 3, 4, 5, 6, 7, 8)

An integrated circuit, comprising the reference voltage generator according to any of claims 1-8.