Local oscillation leakage elimination apparatus and method

本振泄漏消除装置及方法

Abstract

本发明揭示一种本振泄漏消除装置,在基带数字域产生幅度和相位可调的中频辅助信号,并转换成模拟射频调制信号。将中频辅助信号变换成与本振泄漏信号频率相同、幅度相同、相位相反的负本振信号。将负本振信号与本振泄漏信号抵消,从而实现本振泄漏消除的功能。本发明可以根据抵消后的本振泄漏情况在数字域采用尝试法动态调整此信号的幅度和相位,直到本振泄漏的信号能够满足要求为止。由于产生的同本振泄漏信号相抵消的信号是在数字域产生的,可以精确地调整其幅度和相位,方法简单、快捷地实现精确控制本振泄漏消除功能。另外,在调整过程中,不影响发射机的正常工作。
The invention discloses a device for eliminating local oscillation leakage. During operation, the device comprises: generating an intermediate frequency auxiliary signal with adjustable amplitude and phase in a baseband digital domain and converting the intermediate frequency auxiliary signal into an analog radio-frequency modulation signal; converting the intermediate frequency auxiliary signal into a negative local oscillation signal with the frequency and amplitude identical to those of a local oscillation leakage signal and the phase opposite to that of the local oscillation leakage signal; and offsetting the negative local oscillation signal and the local oscillation leakage signal to realize the function of eliminating local oscillation leakage. The device can carry out dynamic adjustment of signal amplitude and phase in a digital domain through the adoption of a trial-and-error method according to the offset local oscillation leakage state till the local oscillation leakage signal meets requirements. Because the signal offsetting the local oscillation leakage signal is generated in the digital domain, the amplitude and phase of the signal can be adjusted accurately. The device has a simple method and can quickly realize accurate control of local oscillation leakage elimination. In addition, the device does not influence the normal operation of a transmitter during adjustment.

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