A broadband integrated vector signal modulation device and method

Abstract

The disclosure provides a broadband integrated vector signal modulation device and method, including a calibration unit, a band selection unit, and a broadband vector modulation and output unit. The calibration unit receives an external calibration signal or uses the output signal of an internal calibration source as a Reference excitation source; the band selection unit is used to receive externally input radio frequency signals to select high and low frequencies, and the low frequency signals in the first band directly enter the low frequency conditioning unit for modulation, and then send them to the sampler for direct sampling; frequency The high-frequency signal and reference signal in the second band enter the signal attenuation and segmental filtering unit together, after signal amplitude adjustment and filtering, they are sequentially transmitted to the power compensation unit, vector modulation and output unit for vector modulation.

Description

Technical field [0001] The present disclosure belongs to the field of radio frequency microwave test, and specific to a broadband integrated vector signal modulation device and method. Background technique [0002] The statement of this section is merely the background technology information related to the present disclosure, which is not necessarily constituted in prior art. [0003] At present, in the process of vector modulation of the broadband signal, the conventional method is to use the wideband coaxial filter to perform the signal filtering of the entire frequency band, and the vector modulation of the entire band vector modulation chip is used. [0004] Modulation and demodulation of broadband vector signals, input, or output signals are a wideband signal, and the received signals are strong with different signals of the frequency, and the large signal will generate a harmonic impact in the amplifier in the passage. The measurement of small signals will affect the measur...

AI Technical Summary

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.

Images