Behavioural Model Extraction Using Novel Multitone Active Load-Pull
This paper presents a new measurement and data analysis approach for both identifying the required Cardiff behavioural model complexity and directly extracting the associated model coefficients, Kp,h,m,n. The technique developed utilizes a multi-tone measurements approach. Load-pull measurements are performed using an engineered multi-tone active load-pull excitation, A21(t), that is chosen for its ability to identify the required model complexity. Fast Fourier Transforming (FFT) the device response, B21(t), allows the respective model mixing order contributions to be directly observed above the noise floor of the measurement system. Formulating the Cardiff behavioural model in the frequency domain, with this selected multi-tone stimulus, also allows for the first time the direct extraction of the model coefficients.