Broadband integrated vector signal modulation device and method

Abstract

The invention provides a broadband integrated vector signal modulation device and method, and the device comprises a calibration unit, a waveband selection unit, and a broadband vector modulation andoutput unit, and the calibration unit receives an external calibration signal or employs an output signal of an internal calibration source as a reference excitation source; wherein the waveband selection unit is used for receiving an externally input radio frequency signal and selecting high and low frequencies, and a low-frequency signal of which the frequency range is in a first waveband directly enters the low-frequency conditioning unit to be modulated and then is sent to the sampler to be directly sampled; and the high-frequency signal with the frequency range in the second waveband andthe reference signal jointly enter the signal attenuation and segmented filtering unit to be subjected to signal amplitude adjustment and filtering, and then are sequentially transmitted to the powercompensation unit and the vector modulation and output unit to be subjected to vector modulation.

Description

technical field [0001] The disclosure belongs to the technical field of radio frequency microwave testing, and in particular relates to a broadband integrated vector signal modulation device and method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] At present, in the process of vector modulation for broadband signals, the traditional method is to use a broadband coaxial filter to filter the signal in the entire frequency band, and use a broadband vector modulation chip to perform vector modulation in the entire frequency band. [0004] For the modulation and demodulation of broadband vector signals, the input or output signal is a broadband signal, and the strength of the received signal varies with the frequency, and the large signal will produce subharmonic effects in the amplifier and modulator in the path , it will affect the measu...

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Problems solved by technology

[0005] As far as the inventor knows, the existing vector modulation scheme is a broadband vector signal modulation unit designed based on discrete devices such as broadband coaxial filters and broadband vector modulators. There is no specially designed front-end calibration path, and the frequency and amplitude response calibration of the radio frequency path requires Manually, the calibration process is complicated, and the channel balance is poor, the volume is large, and the image frequency suppression is poor; at the same time, since the front end of the modulator uses a single broadband filter for signal filtering, and the modulator uses a single broadband modulation chip for vector modulation, the phase of the entire modulation channel and gain error is large

In addition, the receiving front-end adopts a superheterodyne structure, and a special image frequency interference filter needs to be designed to suppress the image frequency. However, this kind of broadband filter has limited suppression ability, resulting in poor image frequency suppression.

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