External resistor and method to minimize power dissipation in DC holding circuitry for a communication system
First Claim
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1. A communication system, comprising:
- phone line side circuitry capable of being coupled to a phone line at a user end of the phone line; and
a DC holding circuit within said phone line side circuitry, the DC holding circuit capable of providing at least some DC termination characteristics at the user end of the phone line, the DC holding circuit including a power dissipating resistor coupled external to an integrated circuit chip interface of said phone line side circuitry, wherein the phone lines side circuitry is configured to communicate with an isolation barrier and wherein the phone line side circuitry is further configured to generate a power supply within the phone line side circuitry from a signal transmitted across the isolation barrier.
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Abstract
A CMOS implementation for a DC holding circuit in direct access arrangement (DAA) circuitry is disclosed that provides desirable inductive behavior while minimizing power dissipation required by the CMOS integrated circuit, particularly at high loop currents. The DC holding circuitry disclosed may include MOS transistors located on a CMOS integrated circuit and an off-chip power dissipating resistor that acts to dissipate power external to the CMOS integrated circuit. The CMOS implementation disclosed also allows a path for drawing DC current to power other CMOS circuits (e.g. ADCs and DACs) in the CMOS integrated circuit.
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Citations
39 Claims
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1. A communication system, comprising:
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phone line side circuitry capable of being coupled to a phone line at a user end of the phone line; and
a DC holding circuit within said phone line side circuitry, the DC holding circuit capable of providing at least some DC termination characteristics at the user end of the phone line, the DC holding circuit including a power dissipating resistor coupled external to an integrated circuit chip interface of said phone line side circuitry, wherein the phone lines side circuitry is configured to communicate with an isolation barrier and wherein the phone line side circuitry is further configured to generate a power supply within the phone line side circuitry from a signal transmitted across the isolation barrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for reducing power dissipation requirements for communication system, comprising:
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coupling an isolation barrier between user end powered side circuitry and user end phone line side circuitry the phone line side circuitry capable of being coupled between the isolation barrier and a phone line;
providing a DC holding circuit within said phone line side circuitry, the DC holding circuit capable of receiving current from said phone line; and
dissipating power within said DC holding circuit with a resistor that is coupled external to an integrated circuit chip interface of said phone line side circuitry; and
generating a power supply within the phone line side circuitry from a signal transmitted across the isolation barrier. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A DC holding circuit for reducing power dissipation requirements of a direct access arrangement integrated circuit that is configured to be coupled between a phone line and an isolation barrier, comprising:
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power supply circuitry within phone line side circuitry, the power supply circuitry providing an internal DC supply voltage for the direct access arrangement integrated circuit;
a power dissipating resistor coupled to said power supply circuitry and coupled external to a chip interface of the direct access arrangement integrated circuit. - View Dependent Claims (17, 18)
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19. A method for reducing power dissipation requirements for a direct access arrangement integrated circuit that is configured to be coupled between the user end of a phone line and an isolation barrier, comprising:
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providing a DC holding circuit that is capable of receiving current from phone lines;
generating an internal DC supply voltage for the integrated circuit with said DC holding circuit; and
coupling an external power dissipating resistor to said power supply circuitry and connected external to said chip interface of the integrated circuit; and
generating a second power supply within the integrated circuit from a signal transmitted across the isolation barrier. - View Dependent Claims (20, 21)
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22. A communication system, comprising:
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phone line side circuitry capable of being coupled to a phone line at a user end of the phone line; and
a DC holding circuit within said phone line side circuitry, the DC holding circuit capable of providing at least some DC termination characteristics at the user end of the phone line, the DC holding circuit including a power dissipating resistor coupled external to an integrated circuit chip interface of said phone line side circuitry, wherein the phone lines side circuitry is configured to communicate with an isolation barrier, the isolation barrier comprising at least one capacitive isolation element, and wherein the phone line side circuitry is further configured to generate a power supply within the phone line side circuitry from a signal transmitted across the isolation barrier. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for reducing power dissipation requirements for communication system, comprising:
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coupling an isolation barrier between user end powered side circuitry and user end phone line side circuitry the phone line side circuitry capable of being coupled between the isolation barrier and a phone line, the isolation barrier comprising at least one isolation capacitor;
providing a DC holding circuit within said phone line side circuitry, the DC holding circuit capable of receiving current from said phone line;
dissipating power within said DC holding circuit with a resistor that is coupled external to an integrated circuit chip interface of said phone line side circuitry; and
generating a power supply within the phone line side circuitry from a signal transmitted across the isolation barrier. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A method for reducing power dissipation requirements for a direct access arrangement integrated circuit that is configured to be coupled between the user end of a phone line and an isolation barrier, comprising:
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providing a DC holding circuit that is capable of receiving current from phone lines;
generating an internal DC supply voltage for the integrated circuit with said DC holding circuit; and
coupling an external power dissipating resistor to said power supply circuitry and connected external to said chip interface of the integrated circuit; and
generating a second power supply within the integrated circuit from a signal transmitted across the isolation barrier, wherein the isolation barrier includes at least one isolation capacitor. - View Dependent Claims (38, 39)
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Specification