Capacitively coupled ring detector with power provided across isolation barrier
First Claim
1. A communication system, comprising:
- phone line side circuitry that may be coupled to phone lines;
powered side circuitry that may be coupled to the phone line side circuitry through a capacitive isolation barrier wherein a signal transmitted across the capacitive isolation barrier is utilized to provide a power supply for at least a portion of the phone line side circuitry;
phone line side ringer circuitry formed within an integrated portion of the phone line side circuitry and powered side ringer circuitry formed within the powered side circuitry; and
a capacitive interface coupling the phone line side ringer circuitry to phone lines.
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Accused Products
Abstract
A communication system is provided with a capacitive isolation barrier in which at least a portion of the ring detection circuits may be integrated into the line side circuitry. Moreover the ring detection circuits on the phone line side of the isolation barrier may be powered at least in part by power transmitted from the powered side of the isolation barrier to the phone line side of the isolation barrier through the barrier capacitors. A capacitive interface may directly connect the ringer circuitry on the phone line side of the barrier to the TIP/RING lines. The capacitive interface operates to linearly attenuate the TIP/RING signal voltage levels from the high phone line levels to levels within integrated circuit technology limitations.
43 Citations
46 Claims
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1. A communication system, comprising:
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phone line side circuitry that may be coupled to phone lines;
powered side circuitry that may be coupled to the phone line side circuitry through a capacitive isolation barrier wherein a signal transmitted across the capacitive isolation barrier is utilized to provide a power supply for at least a portion of the phone line side circuitry;
phone line side ringer circuitry formed within an integrated portion of the phone line side circuitry and powered side ringer circuitry formed within the powered side circuitry; and
a capacitive interface coupling the phone line side ringer circuitry to phone lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
wherein the phone line side circuitry and the powered side circuitry are configured to communicate across the capacitive isolation barrier through digital signals. -
9. The communication system of claim 7 wherein the signal includes a clock signal.
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10. The communication system of claim 7, the capacitive interface formed solely with capacitors.
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11. The communication system of claim 7, the capacitive isolation barrier comprising a plurality of isolation capacitors.
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12. The communication system of claim 11, wherein the phone line side circuitry and the powered side circuitry are configured to communicate bidirectionally across the isolation barrier, at least some of the bidirectionally communication being through the same isolation capacitor.
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13. The communication system of claim 1 wherein the phone line side circuitry and the powered side circuitry are configured to communicate across the capacitive isolation barrier through digital signals.
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14. The communication system of claim 13, wherein the digital signals are communicated at least in part bidirectionally through the same isolation capacitor.
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15. The communication system of claim 1, the capacitive isolation barrier formed solely with capacitors.
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16. The communication system of claim 1, wherein circuitry utilized to extract the power from the signal transmitted across the capacitive isolation barrier is coupled to at least a first node of the phone line side circuitry, the first node operable to be coupled to at least one capacitor of the capacitive isolation barrier, clock information also being communicated through the first node.
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17. The communication system of claim 1 wherein the signal includes a clock signal.
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18. A method of providing a communication system that may be coupled to a phone line, comprising:
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coupling a capacitive isolation barrier between powered circuitry and phone line side circuitry;
providing at least some phone line side integrated ringer circuitry within the phone line side circuitry and powered side ringer circuitry formed within the powered side circuitry;
receiving a signal within the phone line side circuitry, the signal being transmitted across the capacitive isolation barrier;
utilizing the signal transmitted across the capacitive barrier to provide a power supply for at least a portion of the phone line side circuitry; and
capacitively coupling the phone line side integrated ringer circuitry to phone lines. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A phone line connection circuit, comprising:
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a phone line side integrated circuit containing phone line side ringer circuitry and a powered side integrated circuit containing powered side ringer circuitry, the phone line side integrated circuit configured to communicate with the powered side integrated circuit through a capacitive isolation barrier, the phone line side ringer circuitry detecting a ringing condition on TIP and RING phone lines;
a power supply circuit located within the phone line side integrated circuit, the power supply circuit generating a DC power supply from a digital signal received across the capacitive isolation barrier; and
a capacitive interface coupling the ringer circuitry to the TIP and RING phone lines, the interface comprising at least a first and second capacitor. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method of coupling an electrical circuit to a phone line, comprising:
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providing at least a first ringer circuit within a phone line side integrated circuit and second ringer circuit within a powered side integrated circuit, the phone line side integrated circuit and the powered side integrated circuit capable of being coupled together through a capacitive isolation barrier;
utilizing a digital signal transmitted across the capacitive barrier to provide a power supply for at least a portion of the phone line side circuitry; and
connecting the first ringer circuit to the phone line through a capacitor interface between the first ringer circuit and the phone line. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46)
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Specification