Conventional dual up-conversion transmitter usually employs an intermediate frequency (IF) mixer and a radio frequency (RF) mixer to convert baseband user signal to IF and RF in sequence.
传统双上变频发射器通常采用中频(IF)混合器和射频(RF)混合器将基带用户信号依次转换成IF和RF。
Adopt IGBT frequency conversion of German Siemens and voltage feedback series resonance circuit. The conversion efficiency is reaching up to above 97.5%.
采用德国西门子IGBT变频，电压反馈串联谐振电路。变换效率高达97.5%以上。
Special requirement in high speed guide way inspection including inspection frequency up to 200~1000HZ, synchronization in 32 channels and 16 bits A/D conversion are considered in this paper.
轨道梁检测要求检测频率达到200~1000HZ，同时要求所有32路通道同步采集数据，并且要达到16位的A/D转换精度。
Besides, the air conditioner system with frequency conversion has many virtues such as small start-up current, fast refrigeration or calefaction, low noises and so on.
此外，铁路客车空气调节变频控制系统还有启动电流小，快速制冷、制热，噪音小等优点。
Using pseudo random code to modulate the signal's phase equals to frequency up-conversion of the pseudo random code by the carrier frequency.
信号采用伪随机编码进行相位调制，相当于是用载频对伪随机码进行上变频。
A kind of xenon lamps stabilizer is designed which is made up of the tripper-circuit with two-leveled rising voltage and the direct current power circuit with frequency conversion mode.
设计了一种由两级升压触发电路及变频式直流电源电路构成的氙灯安定器。
Taking account of the up-conversion and cross-relaxation effects of cooperation, the spectrum analysis of highly doped EDWA can be carried out over a wider frequency band.
由于考虑了协同上转换和交叉弛豫效应，该算法能够对高掺杂的EDWA进行较宽频谱的分析。
Field-Path model and calculation method are set up for dynamic performance to be accurately calculated in a system of PWM frequency conversion and speed regulation in the paper.
建立了PWM变频调速系统动态性能精确计算的场―路模型和计算方法。
Field-Path model and calculation method are set up for dynamic performance to be accurately calculated in a system of PWM frequency conversion and speed regulation in the paper.
建立了PWM变频调速系统动态性能精确计算的场―路模型和计算方法。
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