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US 8,576,928 B2Granted
Capacitive divider transmission scheme for improved communications isolation
AssigneeIntersil Americas Inc.
InventorAnthony John Allen
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Abstract
A communication system comprising a first and second transceiver is provided. The first transceiver has a first and second port coupled to a communication medium, wherein a first differential capacitor couples the first and second ports together. The second transceiver has a third and fourth port each AC coupled to the communication medium, wherein a second differential capacitor couples the third and fourth ports together.
Claims20
A communication system, comprising:
- a first transceiver having a first and second port coupled to a communication medium, wherein the first port is coupled to a first line of the communication medium and the second port is coupled to a second line of the communication medium;
- a second transceiver having a third and fourth port each AC coupled to the communication medium, wherein the third port is coupled to the first line of the communication medium and the fourth port is coupled to the second line of the communication medium, wherein a second transceiver having a third and fourth port AC coupled to the communication medium includes:
- a first AC coupling capacitor in series with a first resistive element coupling the third port to the first line of the communications medium;
- and
- a second AC coupling capacitor in series with a second resistive element coupling the fourth port to the second line of the communications medium;
- a first capacitor coupled to the first port and ground;
- a second capacitor coupled to the second port and ground;
- a third capacitor coupled to the third port and ground;
- and
- a fourth capacitor coupled to the second port and ground;
- wherein the first and third capacitors are configured to form a first voltage divider with the first AC coupling capacitor, and the second and fourth capacitors are configured to form a second voltage divider with the second AC coupling capacitor, wherein the first, second, third, and fourth capacitors have values that are at least 30% of the values of the first and second AC coupling capacitors such that the first and second voltage dividers provide protection against transients.
8 more elements
A daisy chain communication system, comprising:
- a first communication system, comprising:
- a first transceiver having a first and second port coupled to a communication medium;
- a second transceiver having a third and fourth port each AC coupled to the communication medium, wherein a second transceiver having a third and fourth port AC coupled to the communication medium includes:
- a first AC coupling capacitor in series with a first resistive element coupling the third port to the communications medium;
- and
- a second AC coupling capacitor in series with a second resistive element coupling the fourth port to the communications medium;
- a first capacitor coupled between the first port and ground;
- a second capacitor coupled between the second port and ground;
- a third capacitor coupled between the third port and ground;
- a fourth capacitor coupled between the fourth port and ground;
- wherein the first and third capacitors are configured to form a first voltage divider with the first AC coupling capacitor, and the second and fourth capacitors are configured to form a second voltage divider with the second AC coupling capacitor, wherein the first, second, third, and fourth capacitors have values that are at least 30% of the values of the first and second AC coupling capacitors such that the first and second voltage dividers provide protection against transients;
- wherein the first transceiver comprises an encoder configured to encode a data signal, wherein the first transceiver combines the encoded data signal into a hybrid encoded data signal before transmission;
- and
- wherein the second transceiver comprises a decoder configured to extract a clock signal from the hybrid encoded data signal and resolve the data signal;
- and
- a first device coupled to the first transceiver of the first communication system;
- and
- a second device coupled to the second transceiver of the first communications system.
15 more elements
A method of performing isolated communications, the method comprising:
- receiving a data signal at a first transceiver;
- encoding the data signal and a clock signal with an encoder to generate an encoded data signal;
- combining the encoded data signal with an amplified clock signal to generate a hybrid encoded data signal;
- transmitting the hybrid encoded data signal through a differential voltage capacitor network over a communications medium to a second transceiver.
1 more element
Dependencies are inferred from the claim text.