Device, method and system for estimating the termination to a wired transmission-line based on determination of characteristic impedance
First Claim
1. A device for estimating the termination to a wired transmission-line carrying a signal in a first frequency band, the device comprising:
- a port for connecting to one end of the wired transmission-line,an energy transmitter coupled to said port for transmitting energy to the wired transmission-line, the energy being in a second frequency band distinct and separate from the first frequency band, while the signal in the first frequency band is being carried simultaneously with the energy in the second frequency band by the wired transmission-line, andan impedance measuring unit coupled to the one end of the transmission-line for instantaneously measuring the characteristic impedance Z of the transmission-line on the basis of the energy in the second frequency band, wherein the optimal termination value of the transmission-line is estimated based on the measured value Z.
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Abstract
A system and method for measuring a characteristic impedance of a transmission-line comprises transmitting energy to the line, and shortly after measuring the voltage/current involved and thus measuring the equivalent impedance. The measured characteristic impedance may then be used in order to determine the termination value required to minimize reflections. In another embodiment, the proper termination is set or measured by adjusting the termination value to achieve maximum power dissipation in the terminating device. The equivalent characteristic impedance measurement may be used to count the number of metallic conductors connected to a single connection point. This abstract is not intended to limit or construe the scope of the claims.
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Citations
12 Claims
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1. A device for estimating the termination to a wired transmission-line carrying a signal in a first frequency band, the device comprising:
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a port for connecting to one end of the wired transmission-line, an energy transmitter coupled to said port for transmitting energy to the wired transmission-line, the energy being in a second frequency band distinct and separate from the first frequency band, while the signal in the first frequency band is being carried simultaneously with the energy in the second frequency band by the wired transmission-line, and an impedance measuring unit coupled to the one end of the transmission-line for instantaneously measuring the characteristic impedance Z of the transmission-line on the basis of the energy in the second frequency band, wherein the optimal termination value of the transmission-line is estimated based on the measured value Z. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification