Method and apparatus for determining a response of a DUT to a desired large signal, and for determining input tones required to produce a desired output
AssigneeAgilent Technologies, Inc.
InventorsJason M. Horn, David E. Root, Daniel Gunyan, Jianjun Xu
Life of this patent
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Abstract
A method for determining input tones required to produce a desired output includes the step of extracting a linearization of a spectral map representing a device under test (DUT) that i) is under drive of a large signal having one or more fundamental frequencies with associated amplitudes and phases, and ii) produces an approximation of a desired output having at least one unwanted spectral component. The method includes the further step of using an inverse of the extracted linearization to determine the input tones required to produce the desired output under a given load condition.
Claims20
A method of determining a response of a device under test (DUT) to a desired large signal, the method comprising:
- applying an imperfect large signal, having one or more fundamental frequencies with associated amplitudes and phases, and having at least one unwanted spectral component, to the DUT;
- measuring a first vector response to application of the imperfect large signal, the first vector response having spectral components measured at each port of the DUT;
- sequentially applying small signals to each port of the DUT, while continuing to apply the imperfect large signal;
- for each small signal applied, measuring an additional vector response having spectral components measured at each port of the DUT;
- subtracting the first vector response from each additional vector response to produce difference vectors;
- extracting, from the difference vectors, a linearization of a spectral map representing the DUT;
- determining, using the linearization of the spectral map, a contribution of the at least one unwanted spectral component to the imperfect large signal;
- and
- determining a response of the DUT to the desired large signal by subtracting the contribution of the at least one unwanted spectral component from the first vector response.
A method of determining a response of a device under test (DUT) to a desired large signal having one or more fundamental frequencies with associated amplitudes and phases, the method comprising:
- extracting a linearization of a spectral map representing the DUT under drive of i) the desired large signal, or ii) an approximation of the desired large signal and at least one unwanted spectral component;
- applying an imperfect large signal, having one or more fundamental frequencies with associated amplitudes and phases, and having at least one unwanted spectral component, to the DUT;
- measuring a first vector response to application of the imperfect large signal, the first vector response having spectral components measured at each port of the DUT;
- determining, using the linearization of the spectral map, a contribution of the at least one unwanted spectral component to the imperfect large signal;
- and
- determining a response of the DUT to the desired large signal by subtracting the contribution of the at least one unwanted spectral component from the first vector response.
A method for determining input tones required to produce a desired output, the method comprising:
- extracting a linearization of a spectral map representing a device under test (DUT) that i) is under drive of a large signal having one or more fundamental frequencies with associated amplitudes and phases, and ii) produces an approximation of a desired output and at least one unwanted spectral component;
- and
- using an inverse of the extracted linearization to determine the input tones required to produce the desired output under a given load condition.
Dependencies are inferred from the claim text.