# US 2020/0404208 A1 · Electronic circuit for configuring amplifying circuit configured to output voltage including low noise

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- Number: US 2020/0404208 A1
- Document ID: US20200404208A1
- Status: Published application
- Kind: A1
- Application number: 16/822,930
- Filed: 2020-03-18
- Published: 2020-12-24
- Earliest claimed: 2019-06-21
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Sunyool KANG; Yunhwan JUNG; Heesung CHAE; Sukki YOON; Yongjun CHO
- Web page: https://patentgrep.com/patent/US20200404208A1

## CPC

- G05F 3/262: {using field-effect transistors only}
- G05F 1/468: {characterised by reference voltage circuitry, e.g. soft start, remote shutdown}
- G05F 1/561: {Voltage to current converters (amplifiers H03F)}
- H03F 3/45183: {Long tailed pairs (H03F3/4521, H03F3/45237 take precedence)}
- H03F 3/45192: {Folded cascode stages}
- H03F 3/4521: {Complementary long tailed pairs having parallel inputs and being supplied in parallel}
- H03F 3/45237: {Complementary long tailed pairs having parallel inputs and being supplied in series}
- H04N 25/616: involving a correlated sampling function, e.g. correlated double sampling [CDS] or triple sampling
- H04N 25/78: Readout circuits for addressed sensors, e.g. output amplifiers or A/D converters
- H03F 2200/91: the amplifier has a current mode topology
- H03F 2203/45674: the LC comprising one current mirror
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- H03F: AMPLIFIERS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An electronic circuit is provided. The electronic circuit includes a first current generating circuit configured to output a first operating current based on a first operating voltage; and an input circuit configured to: receive a first current corresponding to a first input voltage and a second current corresponding to a second input voltage, wherein the first current and the second current are based on the first operating current; receive a third current and a fourth current that are generated based on the first operating voltage; and generate a fifth current corresponding to the second input voltage based on a second operating current. The electronic circuit is configured to generate an output voltage that is associated with a difference between the first input voltage and the second input voltage based on the second current, the fourth current and the fifth current, and the fourth current corresponds to the third current.

## Claims

### Claim 1

An electronic circuit comprising:
a first current generating circuit configured to output a first operating current based on a first operating voltage; and
an input circuit configured to:
receive a first current corresponding to a first input voltage and a second current corresponding to a second input voltage, wherein the first current and the second current are based on the first operating current;
receive a third current and a fourth current that are generated based on the first operating voltage; and
generate a fifth current corresponding to the second input voltage based on a second operating current,
wherein the electronic circuit is configured to generate an output voltage that is associated with a difference between the first input voltage and the second input voltage based on the second current, the fourth current and the fifth current, and
wherein the fourth current corresponds to the third current.

### Claim 2 (depends on 1)

The electronic circuit of claim 1, wherein the first current generating circuit is configured to maintain the first operating current, and
wherein the first operating current corresponds to a sum of the first current and the second current.

### Claim 3 (depends on 1)

The electronic circuit of claim 1, wherein the input circuit is further configured to generate a sixth current corresponding to the first input voltage based on the second operating current.

### Claim 4 (depends on 3)

The electronic circuit of claim 3, further comprising a second current generating circuit configured to output the second operating current based on a second operating voltage,
wherein the second current corresponds to a sum of the fifth current and the sixth current.

### Claim 5 (depends on 4)

The electronic circuit of claim 4, wherein the first operating current is 0.7 to 0.9 times the second operating current.

### Claim 6 (depends on 5)

The electronic circuit of claim 5, wherein the second operating voltage is a ground voltage.

### Claim 7 (depends on 1)

The electronic circuit of claim 1, wherein the output voltage is further associated with a difference between a sum of the second current and the fourth current, and the fifth current.

### Claim 8 (depends on 1)

The electronic circuit of claim 1, further comprising a load circuit configured to output the third current and the fourth current based on the first operating voltage.

### Claim 9 (depends on 1)

The electronic circuit of claim 1, wherein the first input voltage is a ramp voltage and the second input voltage is a pixel voltage.

### Claim 10

An electronic circuit comprising:
a first current generating circuit configured to output a first operating current based on an operating voltage, the first operating current including a first current and a second current;
a load circuit configured to output a third current and a fourth current that corresponds to the third current based on the operating voltage; and
an input circuit configured to:
based on a first input voltage, conduct the first current and a fifth current that includes the first current and the third current; and
based on a second input voltage, conduct the second current and output a sixth current, and
wherein the electronic circuit is configured to generate an output voltage that is associated with a difference between the first input voltage and the second input voltage based on the second current, the fourth current and the sixth current.

### Claim 11 (depends on 10)

The electronic circuit of claim 10, further comprising a second current generating circuit configured to output a second operating current that includes the fifth current and the sixth current.

### Claim 12 (depends on 11)

The electronic circuit of claim 11, wherein the second operating current corresponds to a sum of the fifth current and the sixth current.

### Claim 13 (depends on 11)

The electronic circuit of claim 11, wherein the first operating current is 0.7 to 0.9 times the second operating current.

### Claim 14 (depends on 10)

The electronic circuit of claim 10, wherein the output voltage corresponds to a difference between a sum of the second current and the fourth current, and the sixth current.

### Claim 15

An electronic circuit comprising:
a first transistor configured to conduct a first current generated based on an operating voltage and a first input voltage;
a second transistor configured to conduct a second current generated based on the operating voltage and a second input voltage;
a third transistor configured to conduct the first current and a third current generated based on the operating voltage and the first input voltage; and
a fourth transistor configured to conduct a fourth current based on the second input voltage,
wherein the electronic circuit is configured to generate a fifth current that corresponds to the third current, and generate an output voltage that is associated with a difference between the first input voltage and the second input voltage based on the fifth current, the second current and the fourth current.

### Claim 16 (depends on 15)

The electronic circuit of claim 15, further comprising a fifth transistor configured to output a first operating current including the first current and the second current.

### Claim 17 (depends on 15)

The electronic circuit of claim 15, further comprising a sixth transistor configured to output a second operating current including the first current, the third current and the fourth current.

### Claim 18 (depends on 15)

The electronic circuit of claim 15, wherein the first current and the third current are associated with the first input voltage, and
wherein the second current and the fourth current are associated with the second input voltage.

### Claim 19 (depends on 15)

The electronic circuit of claim 15, wherein a noise included in the output voltage is associated with a sum of a first transconductance of the first transistor and a third transconductance of the third transistor or a sum of a second transconductance of the second transistor and a fourth transconductance of the fourth transistor.

### Claim 20 (depends on 15)

The electronic circuit of claim 15, wherein, as a first transconductance of the first transistor, a second transconductance of the second transistor, a third transconductance of the third transistor, and a fourth transconductance of the fourth transistor increase, a noise included in the output voltage decreases.

### Claim 21

(canceled)