| 1. | Design and realization of pll frequency synthesizer based on adf
卫星通信系统高频本振信号源设计 |
| 2. | Variable frequency local oscillator
变频本振器 |
| 3. | Local - oscillation phase noise
本振相位噪声 |
| 4. | The sub - harmonic mixer is used as unit mixer to reduce lo to its 1 / 4
此镜频抑制混频器采用谐波混频器作为单元混频器,将本振频率降低为基频的1 / 4 。 |
| 5. | Based on the introduction it explores into the designing of the broad band filter and the super miniature of local oscillator source
在此基础上提出了本文课题的重要意义，主要对收发信机中宽带滤波器进行设计和探讨、本振源超小型化。 |
| 6. | Select installation and then antenna setting , and set respectively the local oscillator frequencies of the high - frequency tuner of 146 , 138ku , 138c band and so on
选择安装里的天线设定，分别设置146 、 138ku及138c波段等等的高频头本振频率。 |
| 7. | The image rejection mixer is composed of two unit mixers , rf is halved as two parts in quadrature ; lo is halved as two parts in phase ; if is synthesized in quadrature
镜频抑制混频器包含两个单元混频器,射频正交功分,本振同相功分,中频正交合成。 |
| 8. | Carrier frequency leakage less than - 40db can be attained since good agreement of the two diodes antiparalleled in even - harmonic mixer is guaranteed inherently
在简化载波信号产生电路的同时，利用偶次谐波混频器固有的本振偶次谐波高抑制度特性，来抑制载波泄漏。 |
| 9. | It is shown that the excessive local oscillator drive deteriorates the conversion gain of the mixer at high frequencies , a trend not shown in the low frequency approximation
我们征明了在高频下，过大的本振将使得混频器的转换增益减小。这一趋势无法由低频近似模型给出。 |
| 10. | Unlike the monostatic sar , two independent local oscillators are used for up / down conversion in bistatic case , so low frequency components of phase noise cannot be cancelled
双基地sar用两个独立的本振分别实现上变频和下变频,相噪低频分量不能相互抵消,形成与单基地sar不同的低频相噪。 |
