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US 9,866,270 B2Granted
Coaxial data communication with reduced EMI
AssigneeMicrochip Technology Incorporated
InventorsGalin Ivanov, Maarten Kuijk
Life of this patent
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Abstract
Data communication having improved electromagnetic interference (EMI) rejection when communicating through a coaxial cable is provided by using differential transmission and/or reception through a common-mode choke and a dissipative element resulting in extremely low radiated emissions and high immunity to external radiation interference in a low-cost way.
Claims24
A transmission circuit using two coaxial cables each having a center conductor and a shield, comprising:
- an integrated circuit comprising a differential driver having first and second outputs, and a differential receiver having first and second inputs;
- a first common mode choke coupled between the first output of the differential driver and a center conductor of the coaxial cable, and between the second output of the differential driver and the shield of one of the coaxial cables, wherein the shield is directly connected with a first ground node;
- a first terminating impedance coupled between the second output of the first differential driver and a second ground node;
- a second common mode choke coupled between the first input of the differential receiver and the center conductor of the other coaxial cable, and between the second input of the differential receiver and the shield of the other coaxial cable;
- second terminating impedances coupled between the first and second inputs of the differential receiver and the second ground node;
- and
- a dissipative element coupled between the shield of the other coaxial cable and the first ground node.
4 more elements
A transmission circuit using two coaxial cables each having a center conductor and a shield, comprising:
- an integrated circuit comprising a differential driver having first and second outputs, and a differential receiver having first and second inputs;
- a first common mode choke coupled between the first output of the differential driver and a center conductor of the coaxial cable, and between the second output of the differential driver and the shield of one of the coaxial cables;
- a first terminating impedance coupled between the second output of the first differential driver and a first ground node;
- a dissipative element coupled between the shield of the coaxial cable and a second ground node;
- a second common mode choke coupled between the first input of the differential receiver and the center conductor of the other coaxial cable, and between the second input of the differential receiver and the shield of the other coaxial cable, wherein the shield of the other coaxial cable is directly connected with the second ground node;
- second terminating impedances coupled between the first and second inputs of the differential receiver and the first ground node.
3 more elements
A system for transferring information over a coaxial cable having a center conductor and a shield, said system comprising:
- a data transmission device comprising:
- a first integrated circuit comprising a differential driver having first and second outputs,
- a first common mode choke coupled between the first output of the differential driver and the center conductor, and between a first ground node and the shield of one end of the coaxial cable, respectively;
- a first terminating impedance coupled between the second output of the differential driver and the first ground node;
- wherein the shield of the one end of the coaxial cable is directly connected with a second ground node;
- and
- a data reception device comprising:
- a second integrated circuit comprising a differential receiver having first and second inputs,
- a second common mode choke coupled between the first and second inputs of the differential receiver and the center conductor and the shield of another end of the coaxial cable, respectively;
- second terminating impedances coupled between each differential input of the differential receiver and a third ground node, and
- a second dissipative element coupled between the shield of the another end of the coaxial cable and a fourth ground node.
8 more elements
A system for transferring information over a coaxial cable having a center conductor and a shield, said system comprising:
- a data transmission device comprising:
- a first integrated circuit comprising a differential driver having first and second outputs,
- a first common mode choke coupled between the first output of the differential driver and the center conductor, and between a first ground node and the shield of one end of the coaxial cable, respectively;
- a first terminating impedance coupled between the second output of the differential driver and the first ground node;
- a dissipative element coupled between the shield of the one end of the coaxial cable and a second ground node;
- and
- a data reception device comprising:
- a second integrated circuit comprising a differential receiver having first and second inputs,
- a second common mode choke coupled between the first and second inputs of the differential receiver and the center conductor and the shield of another end of the coaxial cable, respectively;
- second terminating impedances coupled between each differential input of the differential receiver and a third ground node, and
- wherein the shield of the another end of the coaxial cable is directly coupled with a fourth ground node.
8 more elements
Dependencies are inferred from the claim text.