Noise figure measurement using narrowband compensation
AssigneeKeysight Technologies, Inc.
InventorsDavid J. Ballo, James B. Kerr, Robert E. Shoulders
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Abstract
A method of determining a noise figure (NF) response of a device under test (DUT) comprises determining a frequency response of a noise receiver over a first frequency range, measuring a gain of the DUT over a second frequency range encompassing the first frequency range, measuring output-noise power of the DUT over the second frequency range, determining an estimated gain of the DUT based on the frequency response of the noise receiver and the gain of the DUT over the first frequency range, and determining the NF response of the DUT over the second frequency range based on the estimated gain and the output-noise power.
Claims20
A method of determining a noise figure (NF) response of a device under test (DUT) using a network analyzer comprising a noise receiver, the method comprising:
- determining a frequency response of the noise receiver over a first frequency range;
- measuring a gain of the DUT over a second frequency range encompassing the first frequency range;
- measuring output-noise power of the DUT over the second frequency range;
- determining an estimated gain of the DUT based on the frequency response of the noise receiver and the gain of the DUT over the first frequency range;
- and
- determining the NF response of the DUT over the second frequency range based on the estimated gain and the output-noise power.
A method of determining a noise figure (NF) response of a device under test (DUT) using a network analyzer comprising a noise receiver, the method comprising:
- for a specified frequency point, multiplying gain values of the DUT across a first frequency range with a frequency response of the noise receiver across the first frequency range, integrating a result of the multiplication to produce a normalization factor, and dividing the result of the multiplication by the normalization factor to produce an effective gain value of the DUT at the specified frequency point;
- and
- determining an NF value for the specified frequency point based on the effective gain value of the DUT and an output-noise power of the DUT.
A system configured to determine a noise figure (NF) response of a device under test (DUT), comprising:
- a network analyzer comprising a noise receiver;
- a first module configured to determine a frequency response of the noise receiver over a first frequency range;
- a second module configured to measure a gain of the DUT over a second frequency range encompassing the first frequency range;
- a third module configured to measure output-noise power of the DUT over the second frequency range;
- a fourth module configured to determine an estimated gain of the DUT based on the frequency response of the noise receiver and the gain of the DUT over the first frequency range;
- and
- a fifth module configured to determine the NF response of the DUT over the second frequency range based on the estimated gain and the output-noise power.
Dependencies are inferred from the claim text.