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US 11,280,833 B2Granted
Testing device and testing method for testing a device under test
AssigneeRohde & Schwarz GmbH & Co. KG
InventorStefan Schmidt
Life of this patent
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Abstract
A testing device and a method for testing a device under test are provided. The testing device comprises at least two signal generators, at least two numerically controlled oscillators, at least two white gaussian noise generators, at least two digital filters, each of which comprising a respective transfer function Hi, at least two adders, at least two digital-to-analog converters, and an analog processor.
Claims19
A testing device for testing a wireless communication device under test, the testing device comprising:
- at least two signal generators,
- at least two numerically controlled oscillators,
- at least two white gaussian noise generators,
- at least two digital filters, each of which comprising a respective transfer function Hi,
- at least two adders,
- at least two digital-to-analog converters, and
- an analog processor,
- wherein each of the at least two signal generators is configured to output a respective digital baseband signal si,
- wherein each of the at least two white gaussian noise generators is configured to output a respective white gaussian noise signal WGNi,
- wherein each of the at least two digital filters is configured to filter the respective white gaussian noise signal WGNi of the corresponding white gaussian noise generator,
- wherein at least one of the at least two numerically controlled oscillators is configured to digitally shift the respective digital baseband signal si of the corresponding signal generator by a respective frequency offset Δfi,
- wherein at least one of the at least two numerically controlled oscillators is configured to digitally shift the respective filtered white gaussian noise signal WGNi*Hi of the corresponding digital filter by a respective frequency offset Δfi,
- wherein at least one of the at least two adders is configured to add the respective digital filter output WGNi*Hi of the corresponding digital filter to the respective frequency-shifted digital baseband signal si of the corresponding numerically controlled oscillator, and
- wherein the digital filters are designed such that an overall noise frequency response, in accordance with a wireless communication standard, after addition with the aid of the analog processor fulfills a minimum ripple requirement outside a defined guard band by which the respective digital baseband signals are separated.
11 more elements
A testing method for testing a wireless communication device under test, the testing method comprising the steps of:
- outputting at least two digital baseband signals si with the aid of at least two respective signal generators,
- outputting at least two white gaussian noise signals WGNi with the aid of at least two respective white gaussian noise generators,
- filtering each of the respective white gaussian noise signals WGNi of the corresponding white gaussian noise generator with the aid of at least two respective digital filters, each of which comprising a respective transfer function Hi
- digitally shifting at least one of the respective digital baseband signals si of the corresponding signal generator by a respective frequency offset Δfi with the aid of at least one of at least two respective numerically controlled oscillators,
- digitally shifting at least one of the respective filtered white gaussian noise signals WGNi*Hi of the corresponding digital filter by a respective frequency offset Δfi with the aid of at least one of at least two respective numerically controlled oscillators, and
- adding at least one of the respective digital filter outputs WGNi*Hi of the corresponding digital filter to the respective frequency-shifted digital baseband signal si of the corresponding numerically controlled oscillator with the aid of at least one of at least two respective adders,
- wherein the digital filters are designed such that an overall noise frequency response, in accordance with a wireless communication standard, after addition with the aid of the analog processor fulfills a minimum ripple requirement outside a defined guard band by which the respective digital baseband signals are separated.
4 more elements
Dependencies are inferred from the claim text.