发射机采用二次上变频的发射机结构。
The transmitter is completed with two up-conversion structure.
研究了基于FPGA的数字上变频的设计和实现。
This Paper deals with the design and implementation of Digital Up Conversion (DUC) by field-programmable gate array (FPGA).
射频模块实现了上变频功能，完成了信号的射频调制。
Frequency conversion function is realized in RF module, and the RF modulation of the signal is completed.
片内LO缓冲器用来驱动发送上变频器，进一步降低了系统的复杂性。
An on-chip LO buffer to drive the transmit up converter further reduces system complexity.
实践证明，GC 5016作为数字上变频器性能满足TD系统的要求。
The practice proves that the performances of GC5016 as a digital up-converter meet the requirements of TD system.
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。
Using pseudo random code to modulate the signal's phase equals to frequency up-conversion of the pseudo random code by the carrier frequency.
DSP和数字上变频和下变频技术是构建高频雷达通用硬件平台的关键技术。
The DSP, Digital Up Converter ( DUC ) and Digital Down Converter (DDC ) are key technology of a hardware-platform.
然后采用正交数字上变频（DUC）技术进行基带信号数字域调制和频率变换。
Then, a solution based on Digital Up Converter(DUC) was proposed, which implemented the conversion of a complex digital baseband signal to a real passband signal.
以L波段为主，论述和设计了兼容多波段上变频器，并且完成了实际电路的制作与调试。
In this paper, taking L-band as the core, a design Compatible Multi-band Up-converter for radio frequency is introduced, and the real circuit is accomplished and tested.
本文介绍了用于微波中继系统发射机的功率放大器、调相器、上变频器等组件的原理和特性。
This paper presents the principles and characteristics of the following modules: power amplifier, phase modulator and up converter, which are used in the transmitter of 1GHz microwave relay system.
该电路采用二次变频低中频结构，集成了低噪声放大器、上变频混频器、下变频混频器等模块。
An RF front-end circuit for a fully integrated CMOS DTV tuner is presented in this paper, where double-conversion low IF architecture is employed.
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。
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.
波形产生器主要由dsp和数字上变频器构成，DS P作为主控制器设定数字上变频器的调制方式和输出波形。
The waveform generator is composed by DSP and quadrature digital upconverter (QDU). DSP is used as main controller to decide the modulation mode and output waveform of QDU.
介绍采用微波混频器的上变频特性实现宽带平方电路的设计方法与具体实现，主要用于高码速率QPS K信号的载波恢复。
An introduction of the design and implementation of a broad-band square circuit is given, which is used to recover the carrier of the high speed QPSK signal.
介绍采用微波混频器的上变频特性实现宽带平方电路的设计方法与具体实现，主要用于高码速率QPS K信号的载波恢复。
An introduction of the design and implementation of a broad-band square circuit is given, which is used to recover the carrier of the high speed QPSK signal.
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