# US 10,503,197 B2 · Current generation circuit

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- Number: US 10,503,197 B2
- Document ID: US10503197B2
- Status: Granted
- Kind: B2
- Application number: 16/220,762
- Filed: 2018-12-14
- Published: 2019-06-20
- Granted: 2019-12-10
- Earliest claimed: 2017-12-14
- Assignees: Ablic Inc.
- Applicants: ABLIC Inc.
- Inventors: Masakazu Sugiura; Atsushi Igarashi; Nao Otsuka
- Web page: https://patentgrep.com/patent/US10503197B2

## CPC

- G05F 3/262: {using field-effect transistors only}
- G05F 3/24: wherein the transistors are of the field-effect type only (G05F3/205, G05F3/26, G05F3/30 take precedence)
- G05F 3/242: {with compensation for device parameters, e.g. channel width modulation, threshold voltage, processing, or external variations, e.g. temperature, loading, supply voltage}
- G05F 3/30: Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities (G05F3/26 takes precedence)
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

## Abstract

A current generation circuit includes: a current source circuit including a first transistor and a first resistor, and configured to output a first current based on a source voltage or a drain voltage of the first transistor and a resistance of the first resistor; a current control circuit including a voltage input terminal, a second transistor and a third transistor, and configured to output a second current based on a source voltage of the second transistor and a resistance of the third transistor; and an impedance circuit including a second resistor formed of a same resistive body as the first resistor and a fourth transistor diode-connected to the second resistor, and configured to generate a control voltage at the voltage input terminal by the first current and the second current, wherein the current generation circuit is configured to output a current based on the second current.

## Claims

### Claim 1

A current generation circuit comprising:
a current source circuit comprising a first transistor having a gate to which a first bias voltage is supplied, and a first resistor connected to a source or drain of the first transistor, and configured to output a first current based on a source voltage or a drain voltage of the first transistor and a resistance of the first resistor;
a current control circuit comprising a voltage input terminal, a second transistor having a gate to which a second bias voltage is supplied, and a third transistor connected to a source of the second transistor and having a gate to which a voltage of the voltage input terminal is supplied, the current control circuit being configured to output a second current based on a source voltage of the second transistor and a resistance of the third transistor; and
an impedance circuit comprising a second resistor formed of a same resistive body as the first resistor, and a fourth transistor connected in series with the second resistor and having a gate and a drain being short-circuited, the impedance circuit being configured to generate a control voltage at the voltage input terminal by the first current and the second current,
wherein the current generation circuit is configured to output a current based on the second current.

### Claim 2 (depends on 1)

The current generation circuit according to claim 1, wherein the first bias voltage is a voltage at which the first transistor operates in a weak inversion region.

### Claim 3 (depends on 1)

The current generation circuit according to claim 1, wherein the second bias voltage is a voltage at which the second transistor operates in a weak inversion region.

### Claim 4

A current generation circuit comprising:
a current source circuit comprising a first transistor having a gate to which a first bias voltage is supplied, and a first resistor connected to a source or drain of the first transistor, and configured to output a first current based on a source voltage or a drain voltage of the first transistor and a resistance of the first resistor;
a current control circuit comprising a voltage input terminal, a second transistor having a gate to which a second bias voltage is supplied, and a third transistor connected to a source of the second transistor and having a gate to which a voltage of the voltage input terminal is supplied, the current control circuit being configured to output a second current based on a source voltage of the second transistor and a resistance of the third transistor; and
an impedance circuit comprising a second resistor formed of a same resistive body as the first resistor, and a PN junction element connected in series with the second resistor, the impedance circuit being configured to generate a control voltage at the voltage input terminal by the first current and the second current,
wherein the current generation circuit is configured to output a current based on the second current.