Realization And Application Of Zero-frequency Reject

In the field of communication technology development,China launched SCDMA technology and took it as the route to develop 5G communication.This technology is unable to provide complete test plan,whether CLP 41 production scanning vector signal analyzer,spectrum analyzer,and other newly emerging science and technology co.,LTD launched the radio frequency real-time spectrum analyzer are not very good to meet in the next few years communications market requirements for test equipment.Modern spectrometer mostly adopts the sweep-frequency superheterodyne receiving scheme,which is bound to generate zero frequency,and zero frequency will have an impact on the ability of the spectrometer to measure low-frequency signals.Only at the frequency points far away from the zero frequency can the dynamic measurement range be increased.This paper is aimed at the above problems.As zero frequency has an impact on the ability of the spectrometer to measure low-frequency.The main content of this paper is:1.Detailed introduction of basic knowledge principles necessary to solve zero-frequency suppression.2.Since the main application of zero-frequency suppression is the spectrum analyzer,it is necessary to first master the working principle and structure block diagram of the spectrum analyzer.3.The realization method of the vibration suppression in superheterodyne spectrum analyzer module,will produce a zero on the frequency of the vibration signal amplitude and phase adjustment,thus producing a contrary to quite original vibration signal amplitude,phase frequency signal,and then to the signal and leakage to the mixer output originally vibration signal cancellation,thus to reduce the leakage of the purpose of this signal amplitude of vibration.