CAJ | 학술논문

讨论了本振源的相位噪声和寄生输出对接收机性能的影响，给出了一种短波接收机DDS本振源的优化设计方案，其中，外倍频电路提高了本振源的频谱纯度，亚倍频程带通滤波器抑制了输出信号的杂散分量。测试结果表明，短波接收机的倒易混频及灵敏度指标得到了改善。该本振源已在短波接收机中获得实际应用。
토론료본진원적상위조성화기생수출대접수궤성능적영향，급출료일충단파접수궤DDS본진원적우화설계방안，기중，외배빈전로제고료본진원적빈보순도，아배빈정대통려파기억제료수출신호적잡산분량。측시결과표명，단파접수궤적도역혼빈급령민도지표득도료개선。해본진원이재단파접수궤중획득실제응용。
The local oscillator is one of the core components in the superheterodyne receivers .The influence of phase noise and spurious signals on the receiver performance was discussed .Then an optimized scheme of the DDS local oscillator of short -wave receiver was given , of which the spectrum purity of the local source was improved by the external frequency multiplier ;and the spurious signal of output was suppressed by the sub -octave band-pass filter.The test results show that the performance of short-wave receiver reciprocal mixing and sensitivity indicator has been improved .