Extracting device of nonlinear characteristics of multi-band multi-mode radio frequency power amplifier

Abstract

The invention discloses an extracting device of nonlinear characteristics of a multi-band multi-mode radio frequency power amplifier. The extracting device comprises a first coupler, a second coupler, an attenuator and at least two AD sampling modules, wherein the coupling end of the first coupler is connected with the input end of the attenuator, each of the AD sampling module is used for acquiring signals in different bands and comprises an original radio frequency signal sampling unit, a distortion radio frequency signal sampling unit and a local oscillator unit, the input end of the original radio frequency signal sampling unit in each of the AD sampling modules is connected with the input end of the second coupler, the input end of the distortion radio frequency signal sampling unit in each of the AD sampling modules is connected with the output end of the attenuator, and the local oscillator unit in each of the AD sampling modules provides local oscillator signals for the original radio frequency signal sampling unit and the distortion radio frequency signal sampling unit in each of the AD sampling modules. The extracting device of nonlinear characteristics of the multi-band multi-mode radio frequency power amplifier has the advantages that requirements for sampling rate of analog-digital converters in the AD sampling modules are reduced, and rigor requirements of the multi-band multi-mode radio frequency power amplifier for the analog-digital converters are satisfied.

Description

technical field [0001] The invention relates to a nonlinear characteristic extraction device, in particular to a multi-band multi-mode radio frequency power amplifier nonlinear characteristic extraction device. Background technique [0002] At present, the coexistence of multiple networks such as 2G, 3G and 4G in wireless communication will exist for a long time. Different networks use different frequency bands, thus requiring different narrowband RF transceiver modules, resulting in multiple sets of RF modules in one base station, resulting in many problems such as too large a base station, difficult site selection, high energy consumption, and greatly increased operating costs. . In order to solve these problems, multi-band RF modules supporting multiple standards and multiple frequency bands have attracted much attention. At present, multi-band multi-mode RF power amplifiers supporting at least two frequency bands have been successfully designed. The nonlinearity of th...

AI Technical Summary

Problems solved by technology

When using the traditional nonlinear characteristic extraction device to extract the nonlinear characteristics of RF power amplifiers, the nth band and the n+1th band are regarded as different carriers of a signal in the same band (that is, the kth band). The center frequencies of the k bands are f k ,△ f k Indicates the spectral width of the signal that needs to be captured in the kth band. At this time, the sampling rate of the analog-to-digital converter (ADC) in the traditional nonlinear characteristic extraction device needs to be at least the spectral width of the captured signal in the kth band △ f k twice that of figure 1 It can be seen that △ f k ﹥△ f n +△ f n+1 , then the analog-to-digital converter (ADC) needs to have a large dynamic range and a very high sampling rate. The current level of process technology simply cannot provide an analog-to-digital converter with an ultra-high sampling rate that meets the accuracy requirements

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