Measuring device and method for operating a measuring device

Abstract

The present invention relates to a method (10) for operating a measuring device (20), in particular a signal and / or spectrum analyzer. The method (10) comprises the steps of: connecting (11) a DUT 30 [device-under-test] to an RF front end (21) of the measuring device (20); receiving and / or measuring (12) one or more signal degradation parameters of the DUT (30) and / or of user equipment attached to the DUT; and adapting (13) a configuration of the RF front end (21) based on at least one of the signal degradation parameters. FIGURE IN ABRIDGED: 1.

Description

Title of the invention: Measuring device and method for operating a measuring device technical field

[0001] The present invention relates to a measuring device, in particular a signal and / or spectrum analyzer, and a method for operating such a measuring device. Technical background

[0002] Signal and spectrum analyzers are essential instruments for measuring and analyzing the characteristics of RF signals and the devices generating said signals. For example, they provide detailed information on signal frequency, amplitude, phase, and other key signal parameters.

[0003] To optimize the performance of a signal analyzer, an RF front end of the analyzer can be tuned to a specific current signal type and power level. This adaptation can be achieved using what is known as an automatic leveling algorithm. Typically, leveling optimizes only the analyzer itself, taking into account the internal parameters of the signal analyzer, or rather, its front end. However, the characteristics of the device that generates the signal to be measured, for example, a device under test, are not considered in this process. Description of the invention

[0004] Thus, the present invention aims to further improve the performance of a measurement device, in particular a signal and / or spectrum analyzer.

[0005] This objective is achieved thanks to the solution provided in the independent solutions below. attached. Advantageous embodiments of the present invention are further defined in the dependent claims.

[0006] According to a first aspect, the present invention relates to a method for operating a measuring device, in particular a signal and / or spectrum analyzer. The method comprises: connecting a DUT to an RF (radio frequency) front end of the measuring device; receiving and / or measuring one or more signal degradation parameters of the DUT and / or of user equipment attached to the DUT; and adapting a configuration of the RF front end based on at least one of the signal degradation parameters.

[0007] The advantage that the signal degradation parameters of the DUT (and of a connected UE) can be taken into account when adapting the RF front end is achieved. Thus, the performance of the measurement device when processing / analyzing RF signals from the DUT can be improved. For example, a figure of merit (e.g., an internal error vector magnitude or a signal-to-interference ratio) of the measurement device is optimized for a given signal bandwidth and RF signal power.

[0008] For example, the measuring device executes an automatic leveling algorithm to adapt the RF front end, it being understood that the automatic leveling algorithm takes into account one or more signal degradation parameters of the DUT and / or user equipment.

[0009] The RF front-end configuration can be further adjusted based on characteristics of the measuring device itself (e.g., including all devices connected up to the DUT) and / or signal characteristics of the RF signal(s) received from the DUT. Thus, information can be fed, along with the signal degradation parameters of the DUT and / or user equipment, into the automatic leveling algorithm.

[0010] The RF front end may include at least one RF port for connecting to the DUT. The RF front end may be a receiver stage of the measuring device. For example, the RF front end is adapted to process an incoming RF signal from the DUT before the signal is converted to an intermediate frequency.

[0011] For example, the method further includes receiving an R signal from the DUT and processing said RF signal with the RF front end on the basis of the adapted configuration.

[0012] The RF front end can be set to different front end configurations. In particular, adapting an RF front end configuration can refer to adapting a configuration and / or an internal parameter of the RF front end. For example, RF front end attenuation (e.g., attenuation of the RF signal received at the front end) can be adapted.

[0013] The measuring device may be a test and / or measurement instrument. For example, the measuring device is a signal analyzer, a spectrum analyzer and / or a vector network analyzer.

[0014] Signal degradation parameters can be automatically measured by the measuring device after connecting the DUT and / or after receiving a respective user instruction.

[0015] The DUT can be an RF device. For example, the DUT is a single-port device (e.g., an antenna), or a two-port device (e.g., an attenuator or a filter).

[0016] The user equipment may be a component, such as a cable or an amplifier, which is disposed between the DUT and the measuring device. For example, The influence of such user equipment (e.g., its degradation parameters) can be measured in the same way as the degradation parameters of a DUT directly connected or connected via a properly equipped user device to the measuring device.

[0017] The user equipment could also include a communication device, for example a mobile device. The DUT could be a component of the user equipment, or vice versa.

[0018] In one embodiment, at least one of the signal degradation parameters is received via a user input on a user interface of the measuring device.

[0019] In one embodiment, the signal degradation parameters include a TOI [third-order-intercept point] of the DUT and / or user equipment.

[0020] In one embodiment, the signal degradation parameters include a NF [noise figure - noise factor] of the DUT and / or user equipment.

[0021] For example, the NF of the DUT and / or user equipment is measured by: measuring a total NF of the measuring device and the DUT and / or user equipment, or by measuring or providing the NF of the measuring device only, and subtracting the NF of the DUT and / or user equipment from the total NF and the NF of the measuring device. For example, the NF of the DUT and / or user equipment can be calculated by subtracting the NF of the measuring device from the total NF.

[0022] In one embodiment the NF of the DUT and / or user equipment is measured by means of an I / Q noise cancellation measurement.

[0023] In one embodiment, at least one of the signal degradation parameters is measured by means of an AM / AM conversion measurement and / or an AM / PM conversion measurement. In this case, AM denotes amplitude modulation and PM denotes phase modulation.

[0024] In one embodiment, the user equipment is uninserted to measure at least one signal degradation parameter of the DUT.

[0025] In one embodiment, the method further comprises storing the received and / or measured signal degradation parameters in a memory of the measuring device. This achieves the advantage that the stored parameters can be used for multiple measurements in the future.

[0026] In one embodiment, the method further includes the display of signal degradation parameters and / or an indication of whether the signal degradation parameters require adaptation of the RF front-end configuration.

[0027] In one embodiment, the configuration of the RF front end is adapted to optimize a figure of merit of the measuring device.

[0028] For example, the figure of merit describes a quality of an analysis of the RF signal with the measurement device. The figure of merit may relate to the magnitude of the internal error vector of the measurement device or, specifically, of the RF front end, it being understood that at least one parameter of the front end is adapted to minimize the magnitude of the internal error vector.

[0029] In one embodiment, the RF front-end configuration includes RF front-end attenuation. For example, in this way, the RF front-end's TOI can be adjusted.

[0030] For example, the method further includes determining at least one RF characteristic of the DUT on the basis of the received RF signal.

[0031] According to a second aspect, the present invention relates to a measuring device, in particular a signal and / or spectrum analyzer. The measuring device comprises: an RF front end adapted to be connected to a DUT [device-under-test]; an interface configured to receive and / or a measuring unit configured to measure one or more signal degradation parameters of the DUT and / or of user equipment attached to the DUT; it being understood that the RF front end is configured to adapt its configuration based on at least one of the signal degradation parameters.

[0032] In one embodiment, the RF front end is configured to receive an RF signal from the DUT and to process said RF signal on the basis of the adapted configuration.

[0033] In one embodiment, the interface includes a user interface configured to receive at least one of the signal degradation parameters via a user input.

[0034] In one embodiment, the measurement unit is configured to perform: an I / Q noise cancellation measurement to determine at least one of the signal degradation parameters, and / or an AM / AM conversion measurement and / or an AM / PM conversion measurement to determine at least one of the signal degradation parameters.

[0035] In one embodiment, the signal degradation parameters include a TOI of the DUT and / or user equipment.

[0036] In one embodiment, the signal degradation parameters include a NF [noise figure - noise factor] of the DUT and / or user equipment.

[0037] For example, the measuring unit is configured to measure the NF of the DUT and / or the user equipment by: measuring a total NF of the measuring device and the DUT and / or user equipment, measuring the NF of the measuring device only, and the NF of the DUT and / or user equipment.

[0038] In one embodiment, the user equipment is uninserted for measurement of at least one signal degradation parameter of the DUT.

[0039] In one embodiment, the measuring device includes a memory configured to store the received and / or measured signal degradation parameters.

[0040] In one embodiment, the measuring device includes a screen configured to display the signal degradation parameters and / or an indication of whether the signal degradation parameters require adaptation of the RF front-end configuration (e.g., whether the degradation parameters are important for automatic leveling).

[0041] In one embodiment, the front end is configured to adapt its configuration to optimize a factor of merit of the measuring device.

[0042] In one embodiment, the RF front-end configuration includes RF front-end attenuation.

[0043] In one embodiment, the measuring device is configured to determine at least one RF characteristic of the DUT on the basis of the received RF signal. Brief description of the figures

[0044] The aspects and features described above are explained in the following description of embodiments with reference to the accompanying figures, in which one can see

[0045] [Fig.1] illustrates steps of a process intended to operate a measuring device according to an embodiment;

[0046] [Fig.2] illustrates steps of a process for operating a measuring device according to an embodiment;

[0047] [Fig.3] illustrates a schematic diagram of a measuring device according to one embodiment;

[0048] [Fig.4] illustrates a schematic diagram of a measuring device according to one embodiment; and

[0049] [Fig.5] illustrates a user interface of a measuring device according to one embodiment. Detailed description

[0050] [Fig. 1] illustrates a method 10 for operating a measuring device according to an embodiment. The measuring device may be an electronic instrument for analyzing a DUT and / or an RF signal received from the DUT. For example, the measuring device is a signal analyzer, a spectrum analyzer, and / or a vector network analyzer.

[0051] The method 10 comprises the following steps: connecting 11 the DUT to an RF front end of the measuring device; receiving and / or measuring 12 one or more signal degradation parameters of the DUT and / or of a user equipment that is attached to and / or connected to the DUT; and adapting 13 a configuration of the RF front end based on at least one of the signal degradation parameters.

[0052] For example, the method 10 further comprises: receiving 14 an RF signal from the DUT and processing said RF signal with the RF front end based on the adapted configuration. For example, the RF front end can adapt an internal attenuation based on the degradation parameters and apply said adapted attenuation to the RF signal.

[0053] By adapting 13 the RF front end based on the signal degradation parameters of the DUT and / or the user equipment, a figure of merit of the measuring device can be optimized. For example, the magnitude of the internal error vector of the measuring device can be reduced and / or the signal-to-interference ratio can be improved for a given signal bandwidth and / or power of the RF signal received 14 from the DUT.

[0054] For example, the RF front end is matched 13 by means of an automatic leveling technique. In this context, an automatic leveling algorithm, which takes into account the signal degradation parameters, is executed by the measuring device or more specifically by a processor of the measuring device. For example, the automatic leveling algorithm adds the DUT to the beginning of the signal chain.

[0055] Additional parameters may be taken into account during the RF front-end matching 13. These additional parameters may include characteristics of the measuring device itself and / or signal characteristics of the RF signals received from the DUT. The characteristics of the measuring device may further include signal degradation parameters, such as the NS, TOI, and / or gain, of components of the measuring device or, more specifically, of the RF front end. The signal characteristics may include a signal type, power level, and / or bandwidth of the RF signals received from the DUT.

[0056] For example, the measuring device configures itself based on signal degradation parameters or presents a user to configure settings that optimize the figure of merit.

[0057] For example, at least some of the signal degradation parameters can be received 12 by means of user input on a user interface, for example a GUI [graphical user interface] or a API [application programming interface] of the measurement device. In other words, a user can directly define the signal degradation parameters which are then used to adapt the RF front end.

[0058] Alternatively or in addition, at least one signal degradation parameter could also be received via a communication interface of the measuring device.

[0059] Furthermore, a user can instruct the measuring device to measure signal degradation parameters via user input. For example, the user can configure a measurement algorithm executed by the measuring device to measure signal degradation parameters.

[0060] The measuring device could therefore automatically measure the signal degradation parameters when the DUT is connected.

[0061] The DUT can be a two-port device that is connected to at least two RF ports of the front end. To measure signal degradation parameters and / or to analyze the DUT, the RF front end can transfer test signals to the DUT via one of its RF ports and receive a response signal from the DUT (for example, a reflection or transmission of the RF test signal) on the same RF port or on a different RF port.

[0062] Thus, the RF signal(s) received from the DUT can be used first to measure the signal degradation parameter(s) and to adapt the RF front end (for example, if the signal degradation parameters are not received via the user input). Then, the RF signal(s) and / or the DUT can be further analyzed by the measuring device with improved performance due to the adapted configuration of the RF front end.

[0063] The one or more signal degradation parameters may include a TOI and / or an NF of the DUT and / or of the user equipment attached to the DUT.

[0064] Thus, the TOI can represent the input or output signal power level at which the power of a third-order intermodulation product is equivalent to the power of the fundamental signal. The NF can be defined as the difference (for example, in dB) between noise delivered at the output of a current receiver and noise delivered at the output of an "ideal" receiver with the same overall gain and bandwidth at a standard noise temperature.

[0065] Thus, the NF of the DUT and / or user equipment can be measured 12 by: measuring a total NF of the measuring device and the DUT and / or user equipment, measuring or providing the NF of the measuring device only, and deducting the NF of the measuring device from the total NF and the NF of the DUT and / or user equipment (for example by subtraction).

[0066] For example, the total NF (of the DUT and the measuring device) and / or the NF of the measuring device can be measured by means of an IQNC [I / Q noise cancellation measurement - I / Q noise cancellation measurement].

[0067] In particular, during such an I / Q noise cancellation measurement, the measuring device can record N I / Q captures. Among the N captures, N1 can be used to deduce an average I / Q signal (with reduced noise). The additional capture can be statistically independent (with respect to noise) and can thus be used to deduce a representative noise factor after subtracting it from the averaged I / Q signal. The noise factors could be deduced from the I / Q captures, the averaged signal, and / or the noise factor.

[0068] By performing such an IQNC measurement with the DUT connected, the total NF can be determined. The NF of only the measuring device can also be known or measured from an IQNC measurement. The measuring device can have an impedance of 50 ohms.

[0069] For example, during DUT analysis with the measurement device, the I / Q captures used for I / Q noise cancellation can be used to additionally apply an error vector magnitude average to the remaining noise contribution (e.g., from the DUT). Consequently, this approach can offer comparable or even faster measurement speeds compared to conventional conformal N-repeat demodulation plus averaging, while simultaneously providing I / Q noise cancellation.

[0070] Furthermore, in both AM / AM and AM / PM conversion measurements, the measuring device transfers an RF test signal (input signal) to the DUT and records a response signal (output signal). In the AM / AM conversion measurement, the measuring device thus measures how the amplitude of the output signal changes in response to changes in the amplitude of the input signal, for example, due to the nonlinear gain characteristics of the DUT and / or the user equipment (amplifier measurement). In the AM / PM conversion measurement, the measuring device measures how the phase of the output signal changes in response to changes in the amplitude of the input signal, for example, due to phase distortion introduced by the DUT and / or the user equipment.

[0071] For example, the user equipment can be unplugged to isolate the DUT when measuring at least one signal degradation parameter of the DUT.

[0072] As can be seen in [Fig. 1], the method 10 may include the optional steps of: storing 17 the received signal degradation parameters and / or measured in a memory of the measuring device, and / or display 16 of the signal degradation parameters and / or an indication of whether the signal degradation parameters require adaptation 13 of the front end configuration.

[0073] For example, the memory can store 17 signal degradation parameters (e.g., NF) from a previous measurement (e.g., saving the NF result from the IQNC measurement and using it for subsequent RF front-end adaptations 13, assuming the DUT has not changed). In this way, the stored signal degradation parameters can be used for the automatic leveling of multiple measurements. Alternatively, an additional measurement can be performed for each new automatic leveling test.

[0074] The measuring device may include a screen for displaying 16 signal degradation parameters and / or a graphical user interface on which the user can enter the signal degradation parameters.

[0075] For example, the adaptation step 13 of the RF front-end configuration may include adapting the RF front-end attenuation. For example, the RF front-end 21 may include an adjustable attenuator, the attenuation of which can be adapted based on the signal degradation parameter(s). For example, in this way, the TOI of the RF front-end can be adjusted.

[0076] As can be seen in [Fig. 1], the method 10 may include the additional step of: determining 15 at least one RF characteristic of the DUT based on the received RF signal. This may relate to a conventional analysis of the RF signal and / or the DUT, which is performed with the measuring device. For example, the measuring device is a signal and / or spectrum analyzer, and the RF characteristic relates to a signal parameter of the RF signal, such as a spectrum, signal level, phase, or bandwidth. Due to the adaptation 13 of the RF front end (for example, improved automatic leveling that takes into account DUT degradations), this DUT analysis can be performed with increased accuracy and measurement speed.

[0077] Figure 2 illustrates steps of the method 10 for operating the measuring device according to one embodiment. In particular, Figure 2 illustrates a possible implementation of process steps 12 and 13.

[0078] As can be seen in [Fig. 2], step 12 may include receiving 12a signal degradation parameters (NF and / or TOI) from a user via a GUI (graphical user interface) and measuring 12b the signal degradation parameters. Measurement 12b may be performed automatically, for example, after the DUT connection 11. It is also It is possible that, upon receipt 12a of a user's parameters, a measurement 12b will be automatically performed after a certain time to update the received parameters.

[0079] Furthermore, the adaptation step 13 of the RF front-end configuration may include the execution 13a of an automatic leveling algorithm and the subsequent optimization 13b of the RF front-end configuration based on the results of the algorithm (for example, adapting an RF front-end attenuation, etc.).

[0080] Figure 3 illustrates a schematic diagram of the measuring device 20 according to one embodiment. For example, the measuring device 20 as illustrated in Figure 3 can operate according to the method 10 as illustrated in any one of Figures 1 and 2.

[0081] The measuring device 20 includes a front end 21 adapted for connection to the DUT 30. The measuring device 20 further includes an interface 22 configured to receive and / or a measuring unit 23 configured to measure one or more signal degradation parameters of the DUT 30 and / or of the user equipment that is attached to and / or connected to the DUT 30. The RF front end 21 is configured to adapt its configuration based on at least one of the signal degradation parameters. For example, the front end 21 is further configured to receive the RF signal from the DUT 30 and to process said RF signal based on the adapted configuration.

[0082] The interface 22 may include a user interface configured to receive at least one of the signal degradation parameters via user input. For example, the measuring device 20 includes a screen, for example a touch screen, which is configured to represent the user interface (for example in the form of a GUI).

[0083] The measuring unit 23 can be configured to perform the aforementioned I / Q noise cancellation measurement(s) and / or the AM / AM and / or AMP / PM conversion measurement(s) to determine at least one of the signal degradation parameters.

[0084] For example, the measuring device 20 includes a signal generator configured to generate RF test signals that are transferred to the DUT, it being understood that the measuring unit is configured to measure the amplitude and / or phase modulation of a response signal received from the DUT 30 in response to the test signal. The measuring unit may include, or be connected to, a processor of the measuring device to analyze the response signal.

[0085] The front end 21 can be a receiver stage of the measuring device. For example, the RF front end 21 is adapted to process an incoming RF signal from the DUT 30 before the signal is converted into a frequency Intermediate processing may include attenuation, (pre-)amplification, conversion, and / or digitization of the RF signal. The RF front end may include at least one RF port for connecting the DUT.

[0086] For example, the measuring device 20 is a signal analyzer or a spectrum analyzer. As such, the measuring device 20 can determine at least one RF characteristic of the DUT 30 and / or the user equipment based on the received RF signal. For example, the RF characteristic relates to a parameter (e.g., spectrum, signal magnitude, bandwidth, etc.) of the RF signal supplied by the DUT. Due to the adaptation of the RF front end 21 (e.g., improved automatic leveling that takes into account DUT degradations), this analysis of the DUT 30 can be performed with increased accuracy and measurement speed.

[0087] The DUT 30 can be an RF device. For example, the RF device is a single-port device (e.g., an antenna) or a two-port device (e.g., an attenuator or a filter).

[0088] The user equipment can be a component, such as a cable or an amplifier, which is disposed between the DUT 30 and the measuring device 20. For example, the user equipment (e.g. a cable), is attached to a port of the DUT and / or to a port of the measuring device 20.

[0089] The user equipment may also be a communication device (for example, a mobile device or a terminal). The DUT 30 may be a component of the user equipment, or vice versa.

[0090] The RF signal can be a signal conforming to a communication standard, for example, a WiFi signal, a 5G signal, or an LTE signal. The RF signal can be a signal generated by a DUT or a response signal from the DUT to a test signal from the measuring device. The RF signal can be a repeating signal.

[0091] Figure 4 illustrates a schematic diagram of the measuring device 20 according to one embodiment. Figure 4 illustrates in particular a possible automatic leveling signal chain.

[0092] The measuring device 20, or more particularly its RF front end 21, may comprise a number of components, it being understood that each component has its own internal degradation parameters (e.g., NF and / or TOI). These internal degradation parameters of the measuring device 20 may also influence the figure of merit (e.g., the EVM) of the device 20. At least some of these internal degradation parameters may be taken into account when adapting the configuration of the RF front end 21, for example, by the automatic leveling algorithm.

[0093] For example, the RF front end 21 may include the following components: a mechanical attenuator, a pre-amplifier, an electrical attenuator, a mixer and an ADC [analog-to-digital converter].

[0094] Figure 5 illustrates a user interface of the measuring device 20 according to one embodiment. This user interface can be displayed on a screen of the device 20.

[0095] For example, the user interface allows a user to select, for each signal degradation parameter, whether the parameter should be automatically measured or entered manually. In the case of NF, the user can further select whether the NF value should be retrieved from a previous IQNC capture or whether a new capture should be performed.

Claims

Demands

1. A method (10) for operating a measuring device (20), in particular a signal and / or spectrum analyzer, comprising: connecting (11) a DUT [device-under-test] (30) to an RF front end (21) of the measuring device (20); receiving and / or measuring (12) one or more signal degradation parameters of the DUT (30) and / or of user equipment attached to the DUT; adapting (13) a configuration of the RF front end (21) based on at least one of the signal degradation parameters.

2. Method (10) according to claim 1, further comprising: receiving (14) an RF signal from the DUT (30) and processing said RF signal with the RF front end (21) on the basis of the adapted configuration.

3. Method (10) according to claim 1 or 2, wherein at least one of the signal degradation parameters is received (12) via a user input on a user interface of the measuring device (20).

4. Method (10) according to any one of the preceding claims, wherein the signal degradation parameters include a TOI [third-order-intercept point] of the DUT (30) and / or user equipment.

5. Method (10) according to any one of the preceding claims, wherein the signal degradation parameters include an NF [noise figure - noise factor] of the DUT (30) and / or user equipment.

6. Method (10) according to claim 5, wherein the NF of the DUT (30) and / or user equipment is measured (12) by: - ​​measuring a total NF of the measuring device (20) and the DUT (30) and / or user equipment, - measuring or supplying the NF of the measuring device (20) only, and - deducting the NF of the DUT (30) and / or user equipment from the total NF and the NF of the measuring device (20).

7. Method (10) according to claim 5 or 6, in which the NF of the DUT (30) and / or user equipment is measured (12) by means of an I / Q [In-phase / Quadrature - in Phase / Quadrature] noise cancellation measurement.

8. A method (10) according to any one of the preceding claims, wherein at least one of the signal degradation parameters is measured (12) by means of an AM / AM [Amplitude Modulation / Amplitude Modulation - Amplitude Modulation / Amplitude Modulation] conversion measurement or an AM / PM [Amplitude Modulation / Phase Modulation - Amplitude Modulation / Phase Modulation] conversion measurement.

9. Method (10) according to any one of the preceding claims, wherein the user equipment is uninserted to measure at least one signal degradation parameter of the DUT (30).

10. Method (10) according to any one of the preceding claims, further comprising: the storage (17) of the received and / or measured signal degradation parameters in a memory of the measuring device (20).

11. Method (10) according to any one of the preceding claims, further comprising: displaying (16) the signal degradation parameters and / or an indication of whether the signal degradation parameters require adaptation (13) of the RF front-end configuration.

12. Method (10) according to any one of the preceding claims, wherein the configuration of the RF front end (21) is adapted (13) to optimize a factor of merit of the measuring device (20).

13. Method (10) according to any one of the preceding claims, wherein the configuration of the RF front end (21) includes attenuation of the RF signal received in the RF front end (21).

14. A measuring device (20), in particular a signal and / or spectrum analyzer, comprising: an RF front end (21) adapted for connection to a DUT (30); an interface (22) configured to receive and / or a measuring unit (23) configured to measure one or more parameters of signal degradation of the DUT (30) and / or of user equipment attached to the DUT; wherein the RF front end (21) is configured to adapt its configuration based on at least one of the signal degradation parameters.

15. Measuring device (20) according to claim 14, wherein the RF front end (21) is configured to receive an RF signal from the DUT (30) and to process said RF signal on the basis of the adapted configuration.

16. Measuring device (20) according to claim 14 and claim 15, wherein the interface (22) comprises a user interface configured to receive at least one of the signal degradation parameters via user input.

17. Measuring device (20) according to any one of claims 14 to 16, wherein the measuring unit (23) is configured to perform - an I / Q [In-phase / Quadrature - In Phase / Quadrature] noise cancellation measurement, and / or - an AM / AM conversion measurement or an AM / PM conversion measurement to determine at least one of the signal degradation parameters.

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