Synthesizer design for network testing device
First Claim
1. A system for generating two signals whose frequencies remain a desired difference from each other while the frequencies for both of the electromagnetic signals vary through multiple ranges of output frequencies, comprising:
- a first tunable synthesizer that produces variable signals varied through a range of frequencies to produce a first set of variable signals;
a second tunable synthesizer that produces a first fixed signal having a first frequency;
a third tunable synthesizer that produces a second fixed signal having a second frequency, the second frequency of the second fixed signal differs from the first frequency of the first fixed signal by an amount equal to the desired difference in frequency between the two sets of output signals;
a first mixer operable to receive the first set of variable signals from the first tunable synthesizer and the first fixed signal from the second tunable synthesizer, the first mixer further operable to combine the first fixed signal with each variable signal of the first set of variable signals to generate a first set of output signals having a first range of output frequencies; and
a second mixer operable to receive the first set of variable signals from the first tunable synthesizer and the second fixed signal from the third tunable synthesizer, the first mixer further operable to combine the second fixed signal with each variable signal of the first set of variable signals to generate a second set of output signals having a second range of output frequencies, the first and second range of output frequencies differing by the desired difference.
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Abstract
A system for generating two signals whose frequencies remain a desired difference from each other while the frequencies for both of the electromagnetic signals vary through multiple ranges of output frequencies. The system includes first, second, and third tunable synthesizers, and a first and second mixers. The first tunable synthesizer produces signals varied through a range of frequencies, while the second and third a first and second fixed signals each having a first frequency. The first mixer receives the signals from the first and second tunable synthesizers, combines the signals to generate a first set of output signals having a first range of output frequencies. The second mixer receives the signals from the first and third tunable synthesizers, combines the signals to generate a second set of output signals having a second range of output frequencies, the first and second range of output frequencies differing by a desired difference.
33 Citations
21 Claims
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1. A system for generating two signals whose frequencies remain a desired difference from each other while the frequencies for both of the electromagnetic signals vary through multiple ranges of output frequencies, comprising:
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a first tunable synthesizer that produces variable signals varied through a range of frequencies to produce a first set of variable signals;
a second tunable synthesizer that produces a first fixed signal having a first frequency;
a third tunable synthesizer that produces a second fixed signal having a second frequency, the second frequency of the second fixed signal differs from the first frequency of the first fixed signal by an amount equal to the desired difference in frequency between the two sets of output signals;
a first mixer operable to receive the first set of variable signals from the first tunable synthesizer and the first fixed signal from the second tunable synthesizer, the first mixer further operable to combine the first fixed signal with each variable signal of the first set of variable signals to generate a first set of output signals having a first range of output frequencies; and
a second mixer operable to receive the first set of variable signals from the first tunable synthesizer and the second fixed signal from the third tunable synthesizer, the first mixer further operable to combine the second fixed signal with each variable signal of the first set of variable signals to generate a second set of output signals having a second range of output frequencies, the first and second range of output frequencies differing by the desired difference. - View Dependent Claims (2, 3, 4, 5)
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6. A device for testing the cabling of a computing network, comprising:
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a first mixer that injects a set of test signals having varied frequencies into the cabling of the network;
a second mixer that produces a set of local oscillator signals each of which differs by a constant amount in frequency from the frequency of an associated one of the set of test signals;
a first synthesizer that directs a set of signals with a range of frequencies into the first mixer and the second mixer;
a second synthesizer that directs a signal having a fixed frequency into the first mixer, the signal from the second synthesizer and the set of signals from the first synthesizer superimposed in the first mixer to produce the set of test signals; and
a third synthesizer that directs a signal having a fixed frequency into the second mixer, the signal from the third synthesizer and the set of signals from the first synthesizer superimposed in the second mixer to produce the set of local oscillator signals, wherein the fixed frequency of the signal from the third synthesizer differs by the constant amount from the fixed frequency of the signal from the second synthesizer. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method for generating electromagnetic signals with multiple ranges of frequencies, comprising:
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varying a frequency of a signal from a first synthesizer through a range of frequencies;
setting a frequency of a signal from a second tunable synthesizer;
setting a frequency of a signal from a third tunable synthesizer, the frequencies of the signals of the first and second tunable synthesizers set a distance apart;
directing the signals from the first synthesizer and second tunable synthesizer into a first mixer where the signals are combined to generate a first range of output signals whose frequencies are the differences in the frequencies of the signals from the first synthesizer and second tunable synthesizer;
directing the signals from the first synthesizer and third tunable synthesizer into a second mixer where the signals are combined to generate second range of output signals whose frequencies are the differences in the frequencies of the signals from the first synthesizer and third tunable synthesizer, the frequencies of each corresponding signal of first and second range of output signals are provided the distance apart; and
resetting the frequency of the signal from the second tunable synthesizer so that when the signal from the first synthesizer having the frequency range is provided to be combined in the first mixer with the signal from the second tunable synthesizer, a third range of signals is generated whose frequencies are approximately contiguous with the frequencies of the signals in the first range of output signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification