PSPICE analysis of HF high-power tuned amplifier and comparison torelated methods

Application of the PSPICE program for analyzing HF high-power tuned amplifier (HFHPTA) is described. The new method is compared to other known methods. Calculation results of the balance of power and the coefficient of efficiency, as well as the errors with reference to catalogue values are given for different methods of analysis     

THE Drive-Wave Shape Influence on the Class C Tuned HF High-Power Amplifiers

The paper investigates the drive-wave shape influence on the performances of tuned HF high-power amplifiers. Using the linear model of high-power HF triode and changing the drive wave shape (cosine, triangular, trapezoidal and pulse) under the same conditions (conducting angle, drive level), the balance of power for the high efficiency design, representing the normalized maximum output power and the efficiency versus the conducting angle or other parameter, are compared.     

Synthesis of the general HF high power tuned amplifier model usingPSPICE package

Application of the PSPICE package for analysing the HF high-power tuned amplifier (HFHPTA) enables nonlinear active element modelling in the HFHPTA. The corresponding coefficients of the electronic tube model (for both triode and tetrode) in the HFHPTA are derived     

高效E类功率放大器的设计

E类功率放大器是一种新型高效率放大器。是实现通信对抗领域用高效率、高功率、小型化功率放大器的重要途径。分析了其工作原理和设计计算方法，并根据计算结果设计了一款短波500W高效E类功率放大器，实际效率接近90％，而且体积小、增益高。     

Signals with flattened extrema in balance power analysis of HFHPTA:theory and applications

In this paper a complete and self-contained account of composite periodic signals with two and three harmonics which possess flattened extrema at the zero point, including their application in the balance power analysis of a HF high-power tuned amplifier (HFHPTA), is presented. It is shown that signals obtained in the balance power analysis of HFHPTA and their derivatives can extremely accurately be approximated with the corresponding signals with flattened extrema at the point &thetas;=0. Two theorems presented in the paper give canonical representations of such signals     

C-band GaAs FET power amplifiers with 70-W output power and 50% PAE for satellite communication use

This paper describes a successfully developed high-power and high-efficiency C-band GaAs FET amplifier for satellite communication systems. To realize high efficiency in a high-power amplifier, an HFET well-designed for high-power applications is developed, and precise design for an amplifier is carried out. The HFET employed achieves reduction in a gate leakage current while maintaining a high maximum drain current. For precise design of an amplifier, large-signal FET model parameters are extracted using pulsed I-V and S-parameter measurements. Based on this model, second harmonic impedances as well as fundamental impedances are determined for obtaining high efficiency and input- and output-matching circuits which are assembled in a compact package are designed to achieve a high-efficiency internally matched amplifier. As a result, the amplifier delivers a high saturated output power of 70 W and a high power-added efficiency of 51%. These characteristics are the record power performance in C-band in terms of simultaneous achievement of high power and high efficiency. A low third order intermodulation distortion of -35 dBc is also obtained at a drain voltage of 10 V.     

General balance power analysis of HFHPTA with (M,N)-compositesignals

A general balance power analysis of HF high-power tuned amplifiers (HFHPTA) with composite drive and output signal obtained by injection of an N-harmonic signal into an M-harmonic carrier signal, is presented. M and N are positive integers where M相似文献   

An alternative approach to improving the efficiency of high powerradio frequency amplifiers

The concept of using fourth-harmonic rather than third-harmonic resonant circuits in the tuned plate circuits of high-power radio-frequency amplifiers to improve operating efficiency is proposed. The advantages are circuit simplicity, greater stability, and simpler adjustment than with third-harmonic-enriched amplifiers because the grid excitation voltage can be sinusoidal. Improvements in plate efficiency, envelope distortion, and carrier shift characteristics are comparable to those achieved with third-harmonic designs: however, implementation is simpler and the amplifier more stable because the requirement to maintain a constant grid current under conditions of plate modulation becomes less critical     

Tuning analysis for the high-Q class-E power amplifier

The effects of component variations on a high-Q class-E amplifier are simulated and measured. Design equations are provided for the case of a 50% duty cycle with B at its optimum value for a given R. Six distinct operating points are analyzed for the output network. The problem of tuning a high-Q class-E amplifier is addressed. Normally, it cannot be tuned for maximum output power without degrading efficiency. An auxiliary circuit is added to the design so that it can be tuned for maximum output power in order to achieve optimum efficiency. Measured data are obtained at low frequencies for an amplifier with a loaded Q of 340     

Increasing efficiency and output power of HFHPTA by injection oftwo harmonics

New balance power analysis of HF high-power tuned amplifiers (HFHPTA) with composite drive and output signal obtained by injection of two harmonics (N and P) into the basic carrier signal (M=1) is presented in this paper. It is shown that injection of two harmonics could increase both maximum output power and maximum efficiency. The corresponding optimal composite drive and output signals possess almost flattened extrema     

High-Efficiency LDMOS Power-Amplifier Design at 1 GHz Using an Optimized Transistor Model

A 10-W LDMOS harmonically tuned power amplifier at 1 GHz with state-of-the-art power-added efficiency of 80% is presented. The fundamental and second-harmonic load impedances are optimized for maximum efficiency while other harmonics are blocked by a low-pass load network. A simplified model of the transistor specialized for harmonically tuned and switched mode operations is proposed and used for the design. Good agreement between simulations and measurements is observed, indicating high accuracy of the model and design approach for these particular applications.      

甲、丙类级联调谐放大器的系统设计与仿真分析

目前,甲、丙类调谐放大器的理论研究较为离散,缺少多级级联 系统设计的理论分析与测试方法。根据设计案例指标需求,结合理论分析,采用Multisim进 行仿真与测试,对级联系统设计中元件参数测量、电路参数计算、系统稳定性调整、工作状 态调整、效率计算、阻抗匹配等关键问题进行了详细解析。仿真实验表明设计符合指标要求 ,可作为甲、丙类多级级联调谐放大器系统设计的参考。     

同轴-波导四路功率合成器的研制

功率合成器是功率放大器中的重要组成部件,其特性直接影响功率放大器的性能。针对系统低损耗和高效率的要求,提出了一种新颖的同轴-波导四路功率合成器的设计方案。用电路仿真软件和电磁场仿真软件协同仿真的方法设计了一款频率范围为2.2～2.3 GHz的低损耗和高效率的四路功率合成器,并进行了加工和测试。测试指标与仿真结果高度吻合,对所提出功率合成器的性能进行了验证。     

P波段高功率小型化收发模块

收发模块作为有源相控阵雷达的核心部件,其性能直接影响雷达的威力. 受天线孔径、载重、供电的限制,提高单通道的发射输出功率、功率密度和效率是提高雷达威力的一个重要途径。介绍了一款基于氮化镓功率管的P 波段大功率收发模块,从GaN 功放模块设计、大功率合成、集成设计与热设计等几个关键技术方面阐述了低频段收发模块实现高功率、小型化、高效率的技术途径和方法,并给出了测试结果。     

Performance Study of a Class-E Power Amplifier With Tuned Series-Parallel Resonance Network

This paper reports on a modified class-E amplifier with a tuned series-parallel resonance network. This configuration introduces two additional resonance frequencies. The design equations required to determine the optimum operations are analyzed in detail by introducing three additional boundary conditions. compared to the conventional class-E amplifier, the numerical results show that the improvements on load resistance, maximum transistor current, power output capability, and maximum frequency can be obtained by properly selecting the resonance frequencies of the tuned network. Comparisons between simulations and measurements of an experimental circuit of the new configuration are drawn to validate the feasibility. The drain efficiency of 81.77%, power-added efficiency of 79.58%, and output power of 32.71 dBm (1.866 W) at 250 MHz are measured.     

Optimal Design of the High-Power Plate and Grid Modulated HF Amplifier by High Modulation Levels

The optimal design of the high power plate and grid modulated selective amplifier is examined in this paper. For the analysis purposes, the linear model of constant plate current characteristics for HF power triode is applied. The carrier wave state of the unmodulated amplifier is chosen so to enable the realization of the high levels of modulation. The results are obtained immediateZy, and the estimated error is acceptable. The estimated characteristic values of this high power and high efficiency HF amplifier are shown in the corresponding diagrams.     

An X-band high-efficiency MMIC power amplifier with 20-dBreturn losses

Describes the design principles and measured performance of an X-band high-efficiency monolithic-microwave-integrated-circuit (MMIC) power amplifier and discuss pertinent factors of the ion-implantation process. Also presented is a worst-case power prediction of the chip performance and a large-signal design using small-signal simulation. This balanced amplifier is fully monolithic with input and output return losses of better than 20 dB provided by Lange couplers. These return losses make it very convenient to cascade with other components. For high-efficiency operation, the drain voltage is 6 V. Across the 40% bandwidth from 8 to 12 GHz, the amplifier produces 1.6 to 2.1 W of output power at 33 to 40% power-added efficiency. For high-power operation, the drain voltage is 8.5 V. The amplifier can produce 2.4 to 2.8 W of output power at 26 to 29% power-added efficiency across the same 40% bandwidth     

输出功率50 W的脉冲染料激光放大器

推导了准稳态下横向抽运的脉冲染料激光放大器的简化速率方程,提出了双侧横向抽运方式的脉冲染料激光放大器的设计原则和设计方法.应用高功率脉冲染料激光放大器的物理设计结果,研制了输出功率为50 W的脉冲染料激光放大器的实验装置.采用铜蒸气激光(CVL)作为抽运光,在此染料激光放大器上进行了实验研究,获得染料激光输出功率为52 W,抽运激光功率提取效率为41%.给出了染料激光波长、注入染料激光功率以及抽运激光的时间和空间匹配特性与染料激光放大器输出激光功率和抽运激光功率提取效率的相互关系,讨论了染料溶液浓度对双侧横向抽运方式的脉冲染料激光放大器的输出光束质量的影响.