RF measuring device with phase fixation function

Abstract

The present invention discloses a RF measuring device with a phase fixation function. The device comprises a local oscillator module which outputs a local oscillator signal and a control module. The local oscillator module comprises a clock generation unit, an analog and digital mixed frequency synthesizer chip, a filtering unit and a voltage controlled oscillator. The clock generation unit outputs phase identification reference clock to the analog and digital mixed frequency synthesizer chip. The control module controls the frequency-division ratio of the analog and digital mixed frequency synthesizer chip through emitting a frequency-division control time sequence signal. The analog and digital mixed frequency synthesizer chip provides voltage-controlled voltage to the voltage controlled oscillator according to the frequency-division ratio, the phase identification reference clock and the feedback local oscillator signal. The filtering unit filters the high-frequency noise of the voltage controlled voltage. The voltage controlled oscillator outputs local oscillator signals with different frequencies according to the voltage controlled voltage. The clock generation unit outputs the phase identification reference clock to the control module and provides work clock to the control module. The control module carries out phase fixation on the phase identification reference clock and the frequency-division control time sequence signal, and the stray signal in the local oscillator signal is reduced.

Description

technical field [0001] The invention relates to the field of electric variable measuring devices, in particular to a radio frequency measuring device with a phase fixing function. Background technique [0002] In a radio frequency measurement device with a frequency sweep function, such as a radio frequency source with a frequency sweep function, a frequency sweep spectrum analyzer, etc., a local oscillator signal is required during the frequency sweep process. Taking the frequency-sweeping spectrum analyzer as an example, the Chinese invention patent application with the application number 201210428656.4 discloses a spectrum analyzer 100 realized by a scheme of continuous three-stage frequency conversion. Please refer to figure 1 , in the spectrum analyzer 100, the radio frequency input signal fRF1 to be measured passes through the first attenuator or amplifier 101 and the first filter 102 in turn and is input to the radio frequency input end of the first mixer 103; the fir...

AI Technical Summary

Problems solved by technology

After making the phase-discrimination reference clock a and the working clock of the controller 310 have the same source, if the phase difference between the frequency division control timing signal b and the phase-discrimination reference clock a is not fixed, the problem of stray signals in the local oscillator signal c still cannot be solved

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