Xi'an Jiaotong University

Yongning He

Xiong Chen

Xiaolong Zhao

Disclosed is a method and system for forward synthesis of a digital predistortion nonlinear model derived from a circuit description, used for nonlinear modeling of a power amplifier. The method includes establishing a frequency band-continuous time-domain expression, transforming the frequency band expression to a baseband expression, and transforming the baseband-continuous time-domain expression to a baseband-discrete time-domain expression. The present disclosure can obtain the DPD nonlinear model by forward synthesis, provide an accurate model structure and initial parameter values for establishing the RF power amplifier model in the power amplifier nonlinear predistortion technology, make full use of the prior knowledge of the RF power amplifier system to obtain the nonlinear model structure that best conforms to the physical essence, and directly obtain the minimum memory depth and nonlinear order, and can be integrated into an RF power amplifier circuit simulation software.

Method and system for forward synthesis of digital predistortion nonlinear model derived from circuit description

A dynamic dual-port passive intermodulation reference signal generator for calibrating an intermodulation testing device includes: a power allocation coupling network, a non-linear device located under a biasing condition, and a voltage modulation module. Extraction of a carrier signal is performed through a power distribution coupling network; the carrier signal as extracted excites a non-linear device to generate an intermodulation signal; this part of signal, together with the excitation signal, is coupled back to two ports of the generator by the same power distribution coupling network, thereby forming reflected and transmitted reference intermodulation levels as reference sources for calibrating the intermodulation testing apparatus. The voltage modulation generating module generates a voltage wave of a certain value, implementing modulation of the intermodulation signal; through the modulated intermodulation signal, the intermodulation testing region power level and intermodulation transient response feature within a nominal range are calibrated for the intermodulation testing device.

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Xi'an, China

Yongning He