# US 2014/0197866 A1 · Voltage to Current Converter

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- Number: US 2014/0197866 A1
- Document ID: US20140197866A1
- Status: Published application
- Kind: A1
- Application number: 13/739,069
- Filed: 2013-01-11
- Published: 2014-07-17
- Earliest claimed: 2013-01-11
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Inventors: E-In Wu
- Web page: https://patentgrep.com/patent/US20140197866A1

## CPC

- H02M 11/00: Power conversion systems not covered by the preceding groups
- G05F 3/262: {using field-effect transistors only}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

## Abstract

The invention provides a voltage to current converter that contains an diode-connected NMOS transistor, a diode-connected PMOS transistor, and a voltage-controlled signal input circuit. The source of the NMOS transistor and the drain of the PMOS transistor are connected together and connected to the voltage-controlled signal input circuit in series. The invention is implemented and tested in the integrated circuit. When an input voltage signal is inputted, a current of the PMOS transistor is substantially linearly proportional to the input voltage signal.

## Claims

### Claim 1

A voltage-current converter circuit, comprising:
an NMOS transistor, comprising a source, a drain, and a gate, wherein the gate of the NMOS transistor is connected to the drain of the NMOS transistor;
a PMOS transistor, comprising a source, a drain, and a gate, wherein the gate of the PMOS transistor is connected to the drain of the PMOS transistor, and the drain of the PMOS transistor is connected to the source of the NMOS transistor; and
a voltage-controlled signal input circuit, comprising a voltage-controlled signal input terminal and a connection node, wherein the connection node is connected to the source of the NMOS transistor and the drain of the PMOS transistor; when the voltage-controlled signal input circuit receives an input voltage signal, a current of the PMOS transistor is substantially linearly proportional to the input voltage signal, and both the voltages of the drain of the NMOS transistor and the source of the PMOS transistor are higher than the voltage of the connection node of the voltage-controlled signal input circuit.

### Claim 2 (depends on 1)

The voltage-current converter circuit as claimed in claim 1, wherein the voltage-controlled signal input circuit comprises a MOSFET transistor.

### Claim 3 (depends on 1)

The voltage-current converter circuit as claimed in claim 1, wherein the drain of the NMOS transistor and the source of the PMOS transistor are connected to equivalent potential voltages.

### Claim at position 4

4-5. (canceled)

### Claim 6

A voltage-current converter circuit, comprising:
a PMOS transistor, comprising a source, a drain, and a gate, wherein the gate of the PMOS transistor is connected to the drain of the PMOS transistor;
an NMOS transistor, comprising a source, a drain, and a gate, wherein the gate of the NMOS transistor is connected to the drain of the NMOS transistor, and the drain of the NMOS transistor is connected to the source of the PMOS transistor; and
a voltage-controlled signal input circuit, comprising a voltage-controlled signal input terminal and a connection node, wherein the connection node is connected to the drain of the NMOS transistor and the source of the PMOS transistor; when the voltage-controlled signal input circuit receives an input voltage signal, a current of the NMOS transistor is substantially linearly proportional to the input voltage signal.

### Claim 7 (depends on 6)

The voltage-current converter circuit as claimed in claim 6, wherein the voltage-controlled signal input circuit comprises a MOSFET transistor.

### Claim 8 (depends on 6)

The voltage-current converter circuit as claimed in claim 6, wherein the source of the NMOS transistor and the drain of the PMOS transistor are connected to equivalent potential voltages.

### Claim 9 (depends on 6)

The voltage-current converter circuit as claimed in claim 6, wherein the source of the NMOS transistor and the drain of the PMOS transistor are connected to different potential voltages respectively.

### Claim 10 (depends on 6)

The voltage-current converter circuit as claimed in claim 6, wherein both the voltages of the source of the NMOS transistor and the drain of the PMOS transistor are lower than the voltage of the connection node of the voltage-controlled signal input circuit.