POWER OVER COAXIAL CABLE
First Claim
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1. A system, comprising:
- a first active inductor coupled between an input power supply and a first end of a cable that is operable to carry a communication signal;
a current-compensation circuit coupled between the second active inductor a second end of the cable and an output power supply; and
a second active inductor coupled between the second end of the cable and the compensation circuit;
wherein the first and second active inductors are configured to enable power to pass through the cable from the input power supply to the output power supply, andwherein the current-compensation circuit is configured to reduce voltage spikes across the active inductors.
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Abstract
An image communication system includes a coaxial cable having first and second ends. A monitor station is coupled to the first end and a camera is coupled to the second end. The monitor station provides power to the camera through the cable, while the cable is also used to carry communication signals transmitted by the camera to the monitor station. The image communication system includes a first active inductor coupled to the first end and a second active inductor coupled to the second end. A current-compensation circuit may also be provided.
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Citations
22 Claims
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1. A system, comprising:
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a first active inductor coupled between an input power supply and a first end of a cable that is operable to carry a communication signal; a current-compensation circuit coupled between the second active inductor a second end of the cable and an output power supply; and a second active inductor coupled between the second end of the cable and the compensation circuit; wherein the first and second active inductors are configured to enable power to pass through the cable from the input power supply to the output power supply, and wherein the current-compensation circuit is configured to reduce voltage spikes across the active inductors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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a gyrator circuit configured as an active inductor to enable power to be passed along a coaxial cable, the gyrator circuit including; an active device; and first and second resistors and a capacitor coupled to the active device, wherein an inductance provided by the gyrator circuit is approximated according to values of the first and second resistors and the capacitor, and wherein the inductance enables the active inductor to have low impedance at a direct current frequency and high impedance at a higher frequency corresponding to a frequency of a video signal carried on the coaxial cable. - View Dependent Claims (12, 13)
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14. An apparatus, comprising:
a current-compensation circuit coupleable to a coaxial cable that carries both a power signal and a video signal, wherein the current-compensation circuit is configurable to reduce voltage spikes in the coaxial cable and in at least one active inductor coupled to the coaxial cable. - View Dependent Claims (15, 16)
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17. A method, comprising:
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using first and second active inductors to pass power from a power supply coupled to a first end of a coaxial cable to a camera coupled to a second end of the coaxial cable, wherein the power is passed along the coaxial cable; and compensating for a change in a load current drawn by the camera that may cause voltage spikes in either or both the active inductors and the coaxial cable, wherein said compensating including filtering the voltage spikes so as to reduce an effect of the voltage spikes on a video signal transmitted by the camera on the coaxial cable. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification