# US 2022/0286318 A1 · Ringing suppression circuit

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- Number: US 2022/0286318 A1
- Document ID: US20220286318A1
- Status: Published application
- Kind: A1
- Application number: 17/392,510
- Filed: 2021-08-03
- Published: 2022-09-08
- Earliest claimed: 2021-03-04
- Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Inventors: Hiroaki Shirato
- Web page: https://patentgrep.com/patent/US20220286318A1

## CPC

- H04L 12/40: Bus networks
- H04B 3/20: Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04L 2012/40215: {Controller Area Network CAN}
- H04L 2012/40273: {the transportation system being a vehicle}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

A ringing suppression circuit according to an embodiment includes a terminator, a switching element configured to connect the terminator between first and second bus lines, and a control signal generation circuit configured to accept a reception result of a signal from a reception circuit that receives the signal transmitted through the first and second bus lines, and generate a control signal for controlling the switching element on a basis of the reception result.

## Claims

### Claim 1

A ringing suppression circuit comprising:
a terminator;
a switching element configured to connect the terminator between first and second bus lines; and
a control signal generation circuit configured to accept a reception result of a signal from a reception circuit that receives the signal transmitted through the first and second bus lines, and generate a control signal for controlling the switching element on a basis of the reception result.

### Claim 2 (depends on 1)

The ringing suppression circuit according to claim 1, wherein
the control signal generation circuit supplies the switching element with the control signal for connecting the terminator to the first and second bus lines for a predetermined period from a timing when a logical value of the signal changes according to the reception result.

### Claim 3 (depends on 1)

The ringing suppression circuit according to claim 1, wherein
the control signal generation circuit includes a timer circuit that generates information about the predetermined period.

### Claim 4 (depends on 3)

The ringing suppression circuit according to claim 3, wherein
the control signal generation circuit includes a logic circuit that generates the control signal.

### Claim 5 (depends on 2)

The ringing suppression circuit according to claim 2, wherein
the timing when the logical value of the signal changes is a timing when the signal transitions from dominant to recessive.

### Claim 6 (depends on 2)

The ringing suppression circuit according to claim 2, wherein
the predetermined period is shorter than a 1 bit time of the signal.

### Claim 7 (depends on 6)

The ringing suppression circuit according to claim 6, wherein
the predetermined period is longer than a period in which ringing occurs.

### Claim 8 (depends on 6)

The ringing suppression circuit according to claim 6, wherein
the control signal generation circuit changes the predetermined period on a basis of information related to a communication rate of the signal transmitted through the first and second bus lines.

### Claim 9 (depends on 1)

The ringing suppression circuit according to claim 1, wherein
the control signal generation circuit is configured to set a suspension period in which the generation of the control signal is suspended.

### Claim 10 (depends on 9)

The ringing suppression circuit according to claim 9, wherein
in a case where a communication rate of the signal transmitted through the first and second bus lines is variable between a low speed and a high speed, the control signal generation circuit sets the suspension period in a case where the communication rate is the low speed.

### Claim 11 (depends on 1)

The ringing suppression circuit according to claim 1, wherein
the control signal generation circuit suspends the generation of the control signal in an arbitration phase, and generates the control signal from a data phase after arbitration.

### Claim 12 (depends on 1)

The ringing suppression circuit according to claim 1, wherein
the switching element and the control signal generation circuit are provided in one or more nodes connected to the first and second bus lines.