Method of measuring noise figure using arbitrary waveforms
First Claim
Patent Images
1. A method of measuring noise figure comprising:
- placing a through line between a source and a receiver;
producing first noise power;
measuring a first measured noise power over a selected bandwidth with the receiver;
programming the source to produce an arbitrary waveform simulating hot noise power over the selected bandwidth;
measuring a second measured noise power over the selected bandwidth with the receiver;
placing a device under test (“
DUT”
) between the source and the receiver;
producing the first noise power;
measuring a third measured noise power with the receiver;
programming the source to produce the arbitrary waveform;
measuring a fourth measured noise power over the selected bandwidth with the receiver; and
calculating a noise figure of the DUT.
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Abstract
Noise figure of a device under test (“DUT”) is measured using a programmable RF source and a receiver, such as a spectrum analyzer. The programmable RF source is operated to produce pseudonoise, such as white Gaussian noise (“WGN”), as the hot noise source. Turning the programmable RF source off provides a good termination to the DUT, which is used as a cold noise source. Alternatively, The pseudonoise produced by the programmable RF source is more predictable in amplitude and frequency hopping than true noise, resulting in faster calibration and measurement.
38 Citations
15 Claims
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1. A method of measuring noise figure comprising:
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placing a through line between a source and a receiver;
producing first noise power;
measuring a first measured noise power over a selected bandwidth with the receiver;
programming the source to produce an arbitrary waveform simulating hot noise power over the selected bandwidth;
measuring a second measured noise power over the selected bandwidth with the receiver;
placing a device under test (“
DUT”
) between the source and the receiver;
producing the first noise power;
measuring a third measured noise power with the receiver;
programming the source to produce the arbitrary waveform;
measuring a fourth measured noise power over the selected bandwidth with the receiver; and
calculating a noise figure of the DUT. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of measuring noise figure comprising:
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placing a through line between a source and an amplifier coupled to a receiver;
producing first noise power;
amplifying the first noise power;
measuring a first measured noise power over a selected bandwidth with the receiver;
programming the source to produce an arbitrary waveform simulating hot noise power over the selected bandwidth;
amplifying the arbitrary waveform;
measuring a second measured noise power over the selected bandwidth with the receiver;
placing a device under test (“
DUT”
) between the source and the amplifier;
producing the first noise power;
measuring a third measured noise power over the selected bandwidth with the receiver;
programming the source to produce the arbitrary waveform simulating hot noise power over the selected bandwidth;
measuring a fourth measured noise power over the selected bandwidth with the receiver; and
calculating a noise figure of the DUT.
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Specification