Method of error vector magnitude (EVM) minimization for a radio frequency (RF) measurement equipment, and RF measurement equipment
A method of error vector magnitude, EVM, minimization for a radio frequency, RF, measurement equipment is provided. The method comprises: measuring the EVM of a receive, RX, chain of the RF measurement equipment in accordance with a transmit, TX, feedback signal; and responsive to a trigger event, actuating one or more power-adjusting members interposed in the RX chain in accordance with the measured EVM of the RX chain. Among others, the RF measurement equipment is thereby consistently operated based on optimal power levels in the RX chain.
1 . A method of error vector magnitude, EVM, minimization for a radio frequency, RF, measurement equipment, the method comprising
measuring the EVM of a receive, RX, chain of the RF measurement equipment in accordance with a transmit, TX, feedback signal; and
responsive to a trigger event, actuating one or more power-adjusting members interposed in the RX chain in accordance with the measured EVM of the RX chain.
2 . The method of claim 1 ,
wherein measuring the EVM of the RX chain of the RF measurement equipment in accordance with the TX feedback signal comprises
continuously measuring the EVM of the RX chain of the RF measurement equipment in accordance with the TX feedback signal.
3 . The method of claim 1 ,
wherein measuring the EVM of the RX chain of the RF measurement equipment in accordance with the TX feedback signal comprises
tapping the TX feedback signal from an arbitrary waveform generator, AWG, of a digital-analog converter, DAC, of a transmit, TX, chain of the RF measurement equipment.
4 . The method of claim 1 ,
wherein measuring the EVM of the RX chain of the RF measurement equipment in accordance with the TX feedback signal comprises
generating the TX feedback signal by a standalone AWG.
5 . The method of claim 1 ,
the trigger event comprising an actuation of a user-operable control element of the RF measurement equipment.
6 . The method of claim 1 ,
wherein actuating the one or more power-adjusting members interposed in the RX chain in accordance with the measured EVM of the RX chain comprises
optimizing the measured EVM of the RX chain in accordance with an iterative optimization technique.
7 . The method of claim 1 ,
wherein actuating the one or more power-adjusting members interposed in the RX chain in accordance with the measured EVM of the RX chain comprises
optimizing the measured EVM of the RX chain in accordance with a machine learning technique.
8 . The method of claim 1 , further comprising
measuring the EVM of the TX chain of the RF measurement equipment in accordance with an RX feedback signal; and
responsive to the trigger event, actuating one or more further power-adjusting members interposed in the TX chain in accordance with the measured EVM of the TX chain.
9 . The method of claim 1 ,
the power-adjusting members comprising one or more of:
an adjustable attenuator; and
an adjustable amplifier.
10 . A radio-frequency, RF, measurement equipment, comprising
a receive, RX, chain, comprising
one or more interposed power-adjusting members; and
a logic device, being configured to
measure an error vector magnitude, EVM, of the RX chain in accordance with a transmit, TX, feedback signal; and
responsive to a trigger event, actuate the power-adjusting members in accordance with the measured EVM of the RX chain.
11 . The RF measurement equipment of claim 10 ,
wherein for measuring the EVM of the RX chain in accordance with the TX feedback signal, the logic device is further configured to
continuously measure the EVM of the RX chain in accordance with the TX feedback signal.
12 . The RF measurement equipment of claim 10 ,
wherein for measuring the EVM of the RX chain in accordance with the TX feedback signal, the logic device is further configured to
tap the TX feedback signal from an arbitrary waveform generator, AWG, of a digital-analog converter, DAC, of a TX chain of the RF measurement equipment.
13 . The RF measurement equipment of claim 10 ,
wherein for measuring the EVM of the RX chain in accordance with the TX feedback signal, the logic device is further configured to
generate the TX feedback signal by a standalone AWG.
14 . The RF measurement equipment of claim 10 , further comprising
a user-operable control element, being configured to
generate the trigger event responsive to an actuation of the same.
15 . The RF measurement equipment of claim 10 ,
wherein for actuating the power-adjusting members in accordance with the measured EVM of the RX chain, the logic device is further configured to
optimize the measured EVM of the RX chain in accordance with an iterative optimization technique.
16 . The RF measurement equipment of claim 10 ,
wherein for actuating the power-adjusting members in accordance with the measured EVM of the RX chain, the logic device is further configured to
optimize the measured EVM of the RX chain in accordance with a machine learning technique.
17 . The RF measurement equipment of claim 10 , further comprising
a TX chain, comprising
one or more further interposed power-adjusting members; and
a power-coupling element, being configured to
provide the TX chain with an RX feedback signal; and
the logic device further being configured to
measure an EVM of the TX chain in accordance with the RX feedback signal; and
responsive to the trigger event, actuate the further power-adjusting members in accordance with the measured EVM of the TX chain.
18 . The RF measurement equipment of claim 17 ,
the power-coupling element comprising one of:
a power coupler; and
a switch.
19 . The RF measurement equipment of claim 10 ,
the power-adjusting members comprising one or more of:
an adjustable attenuator; and
an adjustable amplifier; and
the logic device comprising one of:
a digital signal processor, DSP;
a field-programmable gate array, FPGA; and
an application-specific integrated circuit, ASIC.
20 . The RF measurement equipment of claim 10 ,
the RX chain further comprising one or more of:
a bandpass filter or preselector;
a local oscillator;
an analog-digital converter, ADC; and
a serial interface between the ADC and the logic device being in accordance with a JESD204 standard, revision B.