相移干涉计量中相移器的原路相干相位检测标定

介绍一种原路相干相位检测的标定方法,该方法具有很高的精度,对相移器的线性没有特别要求,相移器的标定与使用是同一光路,消除了标定光路与使用光路不同所带来的误差     

移相器位数对相控阵天线指向精度的影响

本文分析了不同位数的数字移相器对天线扫描及天线校准过程的影响,通过仿真分别比较了四位和五位移相器下的天线扫描精度和天线校准误差。结果表明：移相器位数的提升可显著提高天线扫描精度,减小天线校准误差。但由于移相器位数的增加对工艺和成本要求较高,因此在实际应用中应合理权衡。     

A 4-bit CMOS Phase Shifter Using Distributed Active Switches

This paper presents a novel 4-bit phase shifter using distributed active switches in 0.18-mum RF CMOS technology. The relative phase shift, which varies from 0deg to 360deg in steps of 22.5deg, is achieved with a 3-bit distributed phase shifter and a 180deg high-pass/low-pass phase shifter. The distributed phase shifter is implemented using distributed active switches that consist of a periodic placement of series inductors and cascode transistors, thereby obtaining linear phase shift versus frequency with a digital control. The design guideline of the distributed phase shifter is presented. The 4-bit phase shifter achieves 3.5 plusmn 0.5 dB of gain, with an rms phase error of 2.6deg at a center frequency of 12.1 GHz. The input and output return losses are less than -15 dB at all conditions. The chip size is 1880 mum times 915 mum including the probing pads.     

130 GHz CMOS有源矢量合成移相器

面向毫米波相控阵雷达系统应用,该文基于55?nm?CMOS工艺设计了一款工作于130?GHz的有源矢量(VM)合成移相器.该电路包含宽带正交发生器、可变增益放大和矢量合成模块.为提升移相器相位分辨率和移相精度,该电路可变增益放大采用了具有高频宽带属性的共栅放大结构和具有高增益属性的含中和电容的共源共栅放大结构多级级联的...     

基于查表法的非等步相移误差修正算法研究

在相移式轮廓测量（PMP）技术中，提出了一种基于查表法的相移校正算法，使传统的N步计算方法要以适用于任何相移值（非等步相移）的情况，从而降低了对相移器的精度要求。利用计算机传真技术验证了该修正算法的正确性。     

一种新型铁电体移相器

介绍了一种用于相控阵雷达的新型铁电体移相器,利用有限元方法对铁电体材料加载波导移相器进行了分析,给出了计算结果。最后讨论了铁电体移相器设计中几个值得关注的重要问题。     

Calibration of Phase Shifters on Basis of Vector-Sum Signals

Attenuators and phase shifters which are the circuits for amplitude-phase distribution control are key elements of antenna arrays. Dispersion of technology parameters results in deviation of the characteristics of integral circuits from rated values that requires application of the techniques for this effect compensation. In this paper there are considered the methods for development and calibration of the circuits in a basis of vector-sum signals allowing to modify both amplitude and phase of input high-frequency signal. It is proposed the method of calibration on a basis of interpolation of measured dependences of absolute value and phase of transfer factor on controlling voltage. Application of proposed method for calibration of vector phase shifter with operating frequency band 2.8–3.2 GHz fabricated with 0.18 μmCMOSallows to provide mean square deviation of phase error is not greater than 0.9°. At that amount of required measurements is 20 times decreased comparing known approach on a basis of measurement of all amplitude-phase states.     

一种铁氧体移相器控制系统的设计

首先,阐述了一种铁氧体移相器控制系统,包含波控与移相器驱动电路两部分;然后,由项目设计角度出发,详细介绍了基于FPGA的波控电路设计方法,以及移相器位数与单位脉宽的关系;最后,阐明了移相器工作原理和移相器驱动电路的构成.     

背脊波导双环铁氧体移相器

本文导出双环背脊波导锁式铁氧体移相器的传播常数公式。在典型参数下,计算了该器件的差相移和插入损耗。结果表明,该移相器的优值和差相移比同一条件下的矩形波导的同类移相器的大。为了验证文中所给方程的正确性,对差相移作了实验,其结果与计算值基本相符。     

有源相控阵的幅相误差校正和波束形成一体化方法

有源相控阵的衰减器和移相器会随着波束形成要求的不同幅度和角度值进行调幅和调相,在实际应用中衰减器和移相器的调节会造成原始通道幅相误差发生变化,从而导致波束形成性能的恶化。文中提出一种可将幅相误差校正和波束形成同时完成的一体化方法,在校正原始通道幅相误差的同时,解决了通道幅相误差随形成波束变化而导致的波束形成性能恶化的问题,具有实现简单、运算量小等优点。理论分析和仿真结果证明了该方法的正确性和有效性。     

数控单片移相器的CAD

数控单片移相器的设计技术具有较大的特殊性与复杂性,必须依靠计算机辅助设计提高设计的准确性.对数控单片移相器的计算机辅助设计问题进行了论述,着重讨论了电路设计效率的提高及电磁场验证等问题,为数控单片移相器的研制提供了实用的解决方案.应用这一研究成果,成功开发出高性能X波段单片五位数字移相器.     

一种基于电荷泵锁相环的高精度数字移相方法

移相器是相控阵雷达的核心器件,随着工作频率的逐步提升,传统移相器的插入损耗和相位控制误差恶化严重,导致额外增加的功耗及波束性能变差.本文基于电荷泵锁相环（Charge Pump Phase-Locked Loop,CP-PLL）开展了高精度数字移相方法的研究.在分析CP-PLL相位数学模型与移相机理的基础上,提出了通过数控电流源的方法实现对输出信号相位的精确控制,建立电路模型开展仿真分析,并设计了实验电路模块,通过仿真和实测的对比验证了该方法的有效性和精确性,实现了移相步进优于1°,移相精度优于移相值的10%.该CP-PLL可通过作为本振信号或直接产生发射信号应用于相控阵雷达系统中,具有精度高、功耗低、易集成等特点,从而取代移相器,有效提升相控阵雷达的性能.     

12-18GHz宽带铁氧体移相器设计*

采用矩波导结构形式,对影响饱和差相移的主要参数进行优化,设计了一个可工作于12-18GHz,带宽40%的双环铁氧体移相器,饱和差相移370°,频散约7.8°,插入损耗优于-0.4dB。整个带宽内最少存在三个高次模,但都未被激发。用两级转换器对宽度为15.8mm的空波导进行匹配,可实现反射损耗小于-20dB。计算结果还显示,通过调整两级匹配介质的介电常数和增加一个容性台阶,可以改善移相器的宽带匹配性能。按设计制作出的移相器实测性能:饱和差相移约360°,频散约8°,整个带宽内无损耗峰出现。在12-17.5GHz内插入损耗优于0.6dB,驻波小于1.4。     

Coplanar waveguide phase shifter controlled by a spatially periodic optical illumination

The characteristics of a periodically-illuminated CPW phase shifter are investigated by the spectral domain approach combined with the cascaded transmission line matrix method. It is found that the phase shifter characteristics can be improved by appropriate use of periodic illumination instead of uniform illumination.     

单偏置电压多位分布式MEMS传输线移相器

针对传统多位分布式MEMS传输线(DMTL)移相器需要多个偏置电压控制的问题,提出了一种单电压控制多位DMTL移相器的设计方案。这种移相器的每一位具有不同的弹性系数,因此它们的下拉电压各不相同。给出了这种移相器的相关理论、设计实例及仿真结果。通过仿真结果可知,单偏置电压3位DMTL移相器低位到高位的下拉电压分别为19.73,40.49和74.89 V,低位发生下拉时高位相移偏移小于0.062%(10 GHz,2.925×10-4 rad)。单偏置电压4位DMTL移相器低位到高位的下拉电压分别为19.73,32.55,48.41和74.89 V,低位发生下拉时高位相移偏移小于0.094%(10 GHz,4.425×10-4 rad)。     

量化相移对阵列天线的分析

研究了数字移相器提供的量化相移对正六边形相控阵天线扫描方向图的影响。使用一定精度移相器可降低馈源阵列的量化误差,而天线的方向图和增益只有微小的变化。分别选择2位、4位和6位移相器,比较采用连续相移和不同精度的量化相移时,天线辐射方向图的变化。通过对比分析可选择合适的数字移相器。     

一种移相器的损耗和匹配特性分析

移相器是电调天线的关键部件,通过对一种常用移相器的损耗和匹配特性进行详细分析,指出其可能出现的谐振损耗和失配,并提出了设计这类移相器应避免和该采取的措施。     

11.25°毫米波数字移相器的设计

设计了一种Ka波段11.25°数字移相器。采用一前一后加载支线的方式,在Ka波段内研制出11.25°数字移相器。该移相器在30～31GHz工作频带内,驻波比小于1.65,插入损耗小于3dB,固定相移11.25°,相位精度达到±3°。     

An X-Band Ferroelectric Phase Shifter

An X-band electrically-tunable ferroelectric phase shifter has been constructed. The phase shifter is reciprocal and consists of a thin ferroelectric slab completely filling the transverse plane of a rectangular waveguide with suitable dielectric matching sections placed symmetrically about the slab forming a band-pass filter. Phase shift is controlled by applying a dc electric field to the ferroelectric. The measured characteristics of this device indicate that incremental phase shifts of 40/spl deg/ to 50/spl deg/ are attainable over a bandwidth of 400 Mc centered about 9.3 kMc with insertion losses ranging from 2 to 6 db. Since the phase shifter does not require a magnetic field for operation, the device can be biased with inexpensive, light-weight equipment requiring negligible dc control power, and the response time can be expected to be fast.     

An 8-Bit Digitally Controlled Programmable Phase Shifter Circuit for Sinusoidal Signals with 252∘ Phase Control Range

In this paper, the synthesis, design, and implementation of a programmable phase shifter circuit for sinusoidal signals is presented. The proposed circuit, built-up herein with operational amplifiers (OPAMPs), high precision resistors and low voltage switches, consists of a digitally controlled amplitude attenuator in combination with a single-tone orthogonalizer. Experimental results agree with theoretical background: the attained phase range was 252^° in 256 steps with a median step of 0.9^°. The inaccuracy of the circuit was determined to be of 0.03 %. Contrary to other OPAMP approaches for sinusoidal signals reported in the literature and based on a first-order all-pass filter structure, the approximation suggested in this work is based on a different concept. The achieved results demonstrate the functionality of the system for the case of a sinusoidal signal with frequency of 1 kHz. Notwithstanding, the proposed architecture can be extended to operate at higher frequencies by using different building blocks with larger bandwidth. Furthermore, it can be extended as well to work out with other periodic input waveforms, like triangular shapes or square waves, with the use of an appropriate orthogonalizer.