US 10,313,152 B2Granted

Transmission circuit

AssigneeDenso Corporation

InventorsTomohisa Kishigami, Shuichi Nakamura

Life of this patent

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Abstract

A transmission circuit includes a first transmitter and a second transmitter. The first transmitter turns OFF first transistors when a transmission data is in a high level, and turns ON the first transistors when the transmission data is in a low level. When a permission signal is in the high level, the second transmitter turns ON the second transistors when the transmission data is in the high level, and turns OFF the second transistors when the transmission data is in the low level. Diodes are set to suppress an amplitude of a differential signal in an ON time of the second transistors more than an amplitude of a differential signal in an ON time of the first transistors, to suppress ringing and radiation noise.

Claims7

Dependent claims

A transmission circuit configured to connect to a transmission line and to transmit a differential signal, the transmission circuit comprising:

a first transmitter configured to transmit the differential signal to the transmission line by switching between a drive state for supplying an electric power to the transmission line and a non-drive state for interrupting a supply of the electric power to the transmission line, according to a binary-represented transmission signal received by the first transmitter;
and
a second transmitter configured to transmit the differential signal to the transmission line by switching between a drive state for supplying an electric power to the transmission line and a non-drive state for interrupting a supply of the electric power to the transmission line, according to the binary-represented transmission signal and a permission signal received by the second transmitter, wherein
the non-drive state of the second transmitter occurs in a dominant period when the first transmitter is in the drive state, and the drive state of the second transmitter occurs in a recessive period when the first transmitter is in the non-drive state, and wherein
the second transmitter switching between the drive state and the non-drive state outputs the differential signal in the recessive period with a smaller amplitude and a reverse polarity relative to an amplitude and a polarity of the differential signal output in the dominant period.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/662,535Filed 28 Jul 2017
Priority: JP 2016-1519272 Aug 2016
Published: US 2018/0041361 A18 Feb 2018
Granted: 4 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H04L 12/4625
LAN interconnection over a bridge based backbone: single bridge functionality, e.g. connection of two networks over a single bridge
H03F 3/24
Power amplifiers, e.g. Class B amplifiers, Class C amplifiers: of transmitter output stages
H04B 3/542
Systems for transmission via power distribution lines: the information being in digital form
H04B 3/548
Systems for transmission via power distribution lines: the power on the line being DC

Family

US 2018/0041361 A1Pre-grant publication · published 8 Feb 2018
US 10,313,152 B2This patent

From the US filing history. Foreign family members aren’t listed.

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