Patent ID: 8456175

Claim:
A measurement arrangement for active load pull measurements of a device under test, comprising a wideband analog-to-digital conversion block ( 3 ) connected to the source side and load side of the device under test ( 1 ) for obtaining measurement data for each of the fundamental and one or more harmonic frequencies at the source and load side of the device under test ( 1 ), determining from the measurement data actual measured reflection coefficient versus frequency functions, and determining injections signal parameters by iteratively comparing the actual measured reflection coefficient versus frequency functions with the desired reflection coefficient versus frequency functions, a first injection signal generator ( 7 ) connected to a source side of the device under test ( 1 ) and a second injection signal generator ( 8 ) connected to a load side of the device under test ( 1 ) for supplying an input source signal and injection signals in order to create predetermined reflection coefficients at respective reference planes of the device under test ( 1 ), the predetermined reflection coefficients comprising desired reflection coefficient versus frequency functions at or around a fundamental frequency and at or around one or more harmonic frequencies, the first and second injection signal generator ( 7 , 8 ) comprising arbitrary waveform generators ( 81 ) for converting the injection signal parameters into the injection signals at the source and load side by digital-to-analog conversion, in which the wideband analog-to-digital conversion block ( 3 ) is connected to couplers ( 4 , 5 ) which are connected to the source and load side of the device under test ( 1 ), and the couplers ( 4 , 5 ) comprise down-converters ( 55 ) of measured signals to obtain intermediate frequency signals, and the wideband analog-to-digital conversion block ( 3 ) is further arranged for analog-to-digital conversion of the intermediate frequency signals to obtain the actual measured reflection coefficient versus frequency functions with a first frequency resolution, and in which the first frequency resolution applied in the analog-to-digital conversion is equal to or better than a second frequency resolution applied in the digital-to-analog conversion.