Real-Time Instrument Nonlinear Correction

Applies to M9484C only.

Requires Option NLC.

How it Works

Provides nonlinear correction that does not require calibration (Cal) for waveform, power, or frequency, but requires prior model extraction to characterize system behavior, and dynamically applies correction coefficients in real time when power, frequency, or waveform is changed. For each frequency, there is a specific maximum power range where optimal performance is maintained. If the input power exceeds the maximum allowable range for a given frequency, the signal quality may be degraded due to reduced effectiveness of the nonlinear correction. Even in the low-power region, where the PA exhibits linear behavior, EVM may still be degraded.

To optimize performance, it is recommended to apply 3x oversampling to the waveform.

This Correction requires the Real-Time INC Calibration to be run on the specified channel before you enable and use this correction. See Real-time INC Calibration.

This topic provides user-interface and SCPI descriptions for Real-Time Instrument Nonlinear Correction.

When Real-Time Instrument Nonlinear Correction is enabled, an icon appears in the Signal block, as shown below.

Real-Time Instrument Nonlinear Correction is available only on Signal 1 in a signal group. When this correction is enabled on Signal 1, all other signals are disabled.

Enable Real Time Instrument Nonlinear Correction

Enables and disables Real-Time Instrument Nonlinear Correction.

GUI Location	Signals > Mode set to Waveform File > Nonlinear Correction > Configure > Real-Time Instrument Nonlinear Correction > Enable
SCPI Command	[:SOURce]:GROup<group>:SIGNal<signal>:NCORrection:INSTrument:RTIMe[:STATe] ON\|OFF\|1\|0 [:SOURce]:GROup<group>:SIGNal<signal>:NCORrection:INSTrument:RTIMe[:STATe]?
SCPI Example	:GRO:SIGN:NCOR:INST:RTIM ON :GRO:SIGN:NCOR:INST:RTIM?
Dependencies	Available only when Group Configuration is Independent. Available only on Signal 1 in a signal group. Requires the Real-Time INC Calibration to be run on the specified channel before enabling this correction. See Real-time INC Calibration.
Couplings	Only the first signal in a specified group can be enabled at a time. If another signal in the specified group is set to ON, this setting is set to OFF. This setting, Enable Instrument Nonlinear Correction, and Enable DUT Nonlinear Corrections settings are mutually exclusive. When one is turned ON, the other is turned OFF.
Preset	OFF
State Saved	Yes
Initial S/W Revision	A.19.01