实现了中频滤波器和压缩滤波器的设计。
Intermediate frequency (IF) filter and compression filter are designed.
子电路包括低噪声放大器、射频滤波器、混频器、驱动放大器、功率放大器、中频滤波器等。
The subcircuits consist of the low noise amplifier, RF filter, mixer, driver amplifier, image filter, power amplifier, transmit-receive switch and if filter and so on.
实际应用结果说明，数字中频滤波器比模拟滤波器在可实现最小分辨率带宽、滤波器波形因子、测量速度等方面都具有很大的优势。
This paper is based on the model of near-Gaussian filters, introducing the relationship of sweep time, span, resolution bandwidth and video bandwidth.
对该新方案进行了理论分析，进而对这种改进二次变频方案提出了采用的频率配置关系和中频滤波器参数设计准则，并结合一个工程实例完成了相关设计。
Based on the theory analysis of this scheme and an engineering example, formula of frequency planning and design rules of intermediate frequency filter's parameter are proposed.
采用本组发明的BNKLT系无铅压电陶瓷，研制了中频陶瓷滤波器。
BNKLT lead-free piezoelectric ceramics invented in authors' group were used for making middle frequency ceramic filters.
另一个是低中频复数滤波器设计。
中频引出通过新颖的DGS低通滤波器滤波后输出。
通过对信号进行基于瞬时自相关的瞬时频率提取的方法对中频信号进行分析、识别，然后可以在FP - GA内部构造一个多通道匹配滤波器对信号进行匹配。
The article analyses the signal through the method of gaining instant frequency on the base of instant correlation, then we can make up a multicenter matching filter in the FPGA.
本文设计的均衡器采用了时域和频域联合处理的自适应均衡技术，其中频域均衡作为DFE的前馈滤波部分，时域的反馈滤波的部分使用常规的横向滤波器。
The equalization in frequency domain is the feed-forward filtering of the DFE. And the traditional transversal filter is used in the feed-back filtering in time domain.
首先，对数字中频接收机理论基础进行叙述。并讲述了用于优化数字滤波器系数的遗传算法原理和算法。
First, the theory and basic knowledge of digital Intermediate Frequency receiver and the Genetic Algorithms principle for optimizing the quantization coefficient of the digital filter are expatiated.
根据系统的带宽，在控制器中加入低通滤波器，以保证系统跟踪效果，过滤控制信号中频率过高部分。
According to the system bandwidth, the low pass filter was added in controller to assure the tracking effect of system and filter the super-high frequency in control singles.
中频采样是数字正交鉴相系统中的一项关键技术，具有锐截止特性的中频采样滤波器可以改善鉴相系统的性能。
As a key technology in digital quadrature demodulation system, the direct IF sampling filter with sharp cutting-off transition band can improve the performance of demodulation system.
另外，本文对波导到微带的对极鳍线过渡和中频低通滤波器做了改进。
In addition, the waveguide to microstrip transition and the IF low pass filter are improved, which are used in the mixer.
重点研究了抽取技术，并将这种技术应用于数字中频系统，设计了CIC滤波器和半带滤波器；
The emphasis of research is decimation technology. Design CIC filters and Halfband filters with this theroy.
重点研究了抽取技术，并将这种技术应用于数字中频系统，设计了CIC滤波器和半带滤波器；
The emphasis of research is decimation technology. Design CIC filters and Halfband filters with this theroy.
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