Testing methods using spread-spectrum excitation signals and related test apparatus
AssigneeCommScope Technolgies LLC
InventorsGeorge P. Vella-Coleiro, XiaoHua Hou
Life of this patent
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Abstract
According to methods of performing a passive inter-modulation distortion (“PID”) test, a first excitation signal and a second excitation signal are applied to a device under test, where at least one of the first and second excitation signals is a spread spectrum excitation signal. An output signal is received that includes a PID signal generated from mixing of the first and second excitation signals. At least a portion of the output signal is de-spread. A characteristic of the PID signal may then be measured.
Claims20
A method of performing a passive inter-modulation distortion (“PID”) test, the method comprising:
- applying a first excitation signal and a second excitation signal to a device under test, where at least one of the first and second excitation signals is a spread spectrum excitation signal;
- receiving an output signal that includes a PID signal generated from mixing of the first and second excitation signals;
- de-spreading at least a portion of the output signal;
- and
- measuring a characteristic of the PID signal.
A method of performing a passive inter-modulation distortion (“PID”) test, the method comprising:
- generating a first excitation signal;
- applying a first pseudo-random code sequence to a second signal to generate a second spread spectrum excitation signal;
- applying the first excitation signal and the second spread spectrum excitation signal to a device under test;
- processing an output signal that is output from the device under test to generate a processed output signal;
- applying the first pseudo-random code sequence to the processed output signal;
- and
- measuring a characteristic of a PID signal included in the processed output signal.
A passive inter-modulation distortion (“PID”) test apparatus, comprising:
- at least one signal generator that is configured to generate a first excitation signal and a second spread spectrum excitation signal;
- a test apparatus that holds a device under test, the device under test configured to receive the first and second excitations signals from the at least one signal generator;
- a receiver that is coupled to an output of the device under test so as to receive and down-convert an output signal that includes a PID signal generated by mixing of the first excitation signal and the second spread spectrum excitation signal;
- a de-spreader that de-spreads the down-converted output signal;
- and
- a signal analyzer that measures a characteristic of the de-spread down-converted output signal.
Dependencies are inferred from the claim text.