Isolation system with digital communication across a capacitive barrier
First Claim
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1. A method for providing a plurality of integrated circuits configured to isolate a system side integrated circuit device from a phone line through a plurality of isolation elements, comprising:
- configuring the system side integrated circuit device to communicate a first digital differential signal to at least two of the isolation barrier elements, the at least two isolation barrier elements comprising at least a first isolation capacitor and a second isolation capacitor, wherein the system side integrated circuit device is configured to be isolated from the phone line in order to satisfy phone line isolation regulatory standard;
configuring a line side integrated circuit device to communicate a second digital differential signal to the first isolation capacitor and the second isolation capacitor, wherein the first and second digital differential signals are communicated across the same first and second isolation capacitors so that the first and second isolation capacitors bidirectionally transfer the first and second digital differential signals, the line side integrated circuit device further configured to provide an output signal for sending data to a phone line;
configuring the system side integrated circuit device to provide a clock signal to the line side integrated circuit device through at least one of the plurality of isolation elements; and
configuring the system side integrated circuit device and the line side integrated circuit device so that power is capable of being provided from the system side integrated circuit device to the line side integrated circuit device while still maintaining the isolation required by the phone line isolation regulatory standards.
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Abstract
An isolation system is provided that is suitable for use in telephony, medical instrumentation, industrial process control and other applications. Preferred embodiments of the invention comprise a capacitive isolation barrier across which a digital signal is communicated. The system provides a means of communication across the isolation barrier that is highly immune to amplitude and phase noise interference. Clock recovery circuitry may be employed on one side of the isolation barrier to extract timing information from the digital signal communicated across the barrier, and to filter the effects of phase noise introduced at the barrier. Delta-sigma converters may be disposed on both sides of the isolation barrier to convert signals between analog and digital domains. An isolated power supply may also be provided on the isolated side of the barrier, whereby direct current is generated in response to the digital data received across the isolation barrier. Finally, a bidirectional isolation system is provided whereby bidirectional communication of digital signals is accomplished using a single pair of isolation capacitors. In preferred embodiments, the digital data communicated across the barrier consists of digital delta-sigma data signals multiplexed in time with other digital control, signaling and framing information.
189 Citations
45 Claims
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1. A method for providing a plurality of integrated circuits configured to isolate a system side integrated circuit device from a phone line through a plurality of isolation elements, comprising:
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configuring the system side integrated circuit device to communicate a first digital differential signal to at least two of the isolation barrier elements, the at least two isolation barrier elements comprising at least a first isolation capacitor and a second isolation capacitor, wherein the system side integrated circuit device is configured to be isolated from the phone line in order to satisfy phone line isolation regulatory standard;
configuring a line side integrated circuit device to communicate a second digital differential signal to the first isolation capacitor and the second isolation capacitor, wherein the first and second digital differential signals are communicated across the same first and second isolation capacitors so that the first and second isolation capacitors bidirectionally transfer the first and second digital differential signals, the line side integrated circuit device further configured to provide an output signal for sending data to a phone line;
configuring the system side integrated circuit device to provide a clock signal to the line side integrated circuit device through at least one of the plurality of isolation elements; and
configuring the system side integrated circuit device and the line side integrated circuit device so that power is capable of being provided from the system side integrated circuit device to the line side integrated circuit device while still maintaining the isolation required by the phone line isolation regulatory standards. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for providing a phone line direct access arrangement circuitry for a phone line, comprising:
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providing a system side integrated circuit device to communicate a first digital differential signal to at least a first isolation capacitor and a second isolation capacitor, wherein the system side integrated circuit device may be isolated from the phone line in order to satisfy phone line isolation regulatory standards;
providing a line side integrated circuit device to communicate a second digital differential signal to the first isolation capacitor and the second isolation capacitor, wherein the first and second digital differential signals are communicated across the same first and second isolation capacitors so that the first and second isolation capacitors bidirectionally transfer the first and second digital differential signals;
providing the system side integrated circuit device to provide a clock signal to the line side integrated circuit device through at least one of the plurality of isolation elements, wherein the clock signal is provided from the system side integrated circuit device to the line side integrated circuit device through an isolation element that is separate from the first isolation capacitor and the second isolation; and
configuring the system side integrated device and the line side integrated circuit device so that power is capable of being provided from the system side integrated circuit device to the line side integrated circuit device while still maintaining the isolation required by the phone line isolation regulatory standards. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method for providing a plurality of integrated circuits configured to isolate a system side integrated circuit device from a phone line through a plurality of isolation elements, comprising:
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configuring the system side integrated circuit device to communicate a first digital differential signal to at least two of the isolation barrier elements, the at least two isolation barrier elements comprising at least a first isolation capacitor and a second isolation capacitor, wherein the system side integrated circuit device is configured to be isolated from the phone line in order to satisfy phone line isolation regulatory standards;
configuring a line side integrated circuit device to communicate a second digital differential signal to the first isolation capacitor and the second isolation capacitor, wherein the first and second digital differential signals are communicated across the same first and second isolation capacitors so that the first and second isolation capacitors bidirectionally transfer the first and second digital differential signals, the line side integrated circuit device further configured to provide an output signal for sending data to a phone line;
configuring the system side integrated circuit device to provide a clock signal to the line side integrated circuit device through at least one of the plurality of isolation elements; and
configuring the system side integrated circuit device and the line side integrated circuit device so that power is capable of being provided from the system side integrated circuit device to the line side integrated circuit device while still maintaining the isolation required by the phone line isolation regulatory standards, wherein at least one of the first digital differential signal and the second digital differential signal includes both data and control information. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for providing a plurality of integrated circuits configured to isolate a system side integrated circuit device from a phone line through a plurality of isolation elements, comprising:
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configuring the system side integrated circuit device to communicate a first digital differential signal to at least two of the isolation barrier elements, the at least two isolation barrier elements comprising at least a first isolation capacitor and a second isolation capacitor, wherein the system side integrated circuit device is configured to be isolated from the phone line in order to satisfy phone line isolation regulatory standards;
configuring a line side integrated device to communicate a second digital differential signal to the first isolation capacitor and the second isolation capacitor, wherein the first and second digital differential signals are communicated across the same first and second isolation capacitors so that the first and second isolation capacitors bidirectionally transfer the first and second digital differential signals, the line side integrated circuit device further configured to provide an output signal for sending data to a phone line;
wherein at least one of the first digital differential signal and the second digital differential signal includes both data and control information. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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38. A method for providing a plurality of integrated circuits configured to isolate a system side integrated circuit device from a phone line through a plurality of isolation elements, comprising:
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configuring the system side integrated circuit device to communicate a first digital differential signal to at least two of the isolation barrier elements, the at least two isolation barrier elements comprising at least a first isolation capacitor and a second isolation capacitor, wherein the system side integrated circuit device is configured to be isolated from the phone line in order to satisfy phone line isolation regulatory standards;
configuring a line side integrated circuit device to communicate a second digital differential signal to the first isolation capacitor and the second isolation capacitor, wherein the first and second digital differential signals are communicated across the same first and second isolation capacitors so that the first and second isolation capacitors bidirectionally transfer the first and second digital differential signals, the line side integrated circuit device further configured to provide an output signal for sending data to a phone line;
configuring the system side integrated circuit device to provide a clock signal to the line side integrated circuit device through at least one of the plurality of isolation elements, wherein the clock signal is provided from the system side integrated circuit device to the line side integrated circuit device through an isolation element that is separate from the first isolation capacitor and the second isolation capacitor; and
configuring the system side integrated circuit device and the line side integrated circuit device so that power is capable of being provided from the system side integrated circuit device to the line side integrated circuit device to generate at least one power supply within the line side integrated circuit device, while still maintaining the isolation required by the phone line isolation regulatory standards, wherein at least one of the first digital differential signal and the second digital differential signal includes both data and control information. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45)
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Specification
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Current AssigneeSilicon Laboratories Incorporated
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Original AssigneeSilicon Laboratories Incorporated
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InventorsScott, Jeffrey W., Welland, David R., Sooch, Navdeep S.
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Primary Examiner(s)JEAN PIERRE, PEGUY
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Application NumberUS09/939,977Publication NumberTime in Patent Office638 DaysField of Search341/110, 341/143, 341/144, 341/155, 379/412, 379/399US Class Current341/110CPC Class CodesH04B 14/062 using delta modulation or o...H04L 25/0266 Arrangements for providing ...H04L 25/06 Dc level restoring means; B...H04L 7/033 using the transitions of th...H04M 11/06 Simultaneous speech and dat...
