有源旁路功率放大器改善低功率电源效率

手机电池的使用时间很大程度上取决于功率放大器的功耗，当移动通信网络的覆盖率越来越高时，手机经常会以较低的功率发送信号，因此在低功率等级下的电源效率对于能否达到优化效能就变得非常重要。     

有源旁路功率放大器改善低功率电源效率

手机电池的使用时间很大程度上取决于功率放大器的功耗,当移动通信网络的覆盖率越来越高时,手机经常会以较低的功率发送信号,因此在低功率等级下的电源效率对于能否达到优化效能就变得非常重要.     

音频功率放大器功率传输及效率问题的探讨

讨论音频功率放大器功率传输及效率问题。通过分析和计算，得到传输功率、效率随负载变化的关系，认为在实际应用中，根据具体的功率要求，应兼顾传输功率和效率，合理地配接最佳负载。     

浅谈音频功率放大器功率传输及效率

探讨了音频功率放大器功率传输及效率问题。通过分析和计算,得到传输功率、负载变化的关系,认为在实际应用中,根据具体的功率要求,应兼顾传输功率和效率,合理地配接最佳负载。     

实现移动WiMAX的关键在于提高功率放大器的效率

移动WiMAX的实用化日期渐渐临近,但目前移动WiMAX手机中使用的功率放大器的PAE只有10%～20%。低效率引起较高的功耗,从而导致移动WiMAX终端的电池使用时间过短。移动WiMAX能够实现真正的"移动"么?     

26 GHz高回退效率Doherty功率放大器

针对功率回退时主路功率放大器不能有效进入饱和状态导致Doherty功率放大器回退效率低的问题,通过降低主路功率放大器的供电电压,实现了高回退效率,同时增大辅路功放管的尺寸弥补了电路的总输出功率。基于0. 1μm GaAs pHMET工艺,设计了一个26 GHz两级非对称的Doherty功率放大器。仿真结果表明,在26 GHz时增益达到16 dB,功放的饱和输出功率为27. 4 dBm,峰值功率附加效率(PAE)为40. 7%,输出功率回退7 dB时PAE仍达到38%,与传统Doherty功率放大器相比具有更高的回退效率,版图的尺寸为3. 2 mm×2. 2 mm。     

C波段紧凑型25 W GaN宽带功率放大器

基于0.25 μm GaN工艺和以SiC为衬底的高电子迁移率晶体管(HEMT)技术,采用电抗匹配、优化电路的静态直流工作点、三级放大结构栅宽比1:3.6:16等措施,保证电路的增益和功率指标,实现了C波段高功率、高增益和高效率的宽带单片微波集成电路(MMIC)放大器。芯片测试结果表明,在4~8 GHz频率范围内,漏极电压28 V,连续波条件下,放大器的小信号增益大于30 dB,大信号增益大于23 dB,饱和输出功率大于44 dBm,功率附加效率为38%~45%。该单片放大器芯片尺寸为3.6 mm×4.0 mm。     

Avago的全新线性功率放大器模块可延长GSM/EDGE手机的通话时间

Avago宣布推出全新功率放大器模块（PAM）,可延长GSM/EDGE通信手机的通话时间。全新ACPM-7868 PAM与Qualcomm最新一代芯片组完全兼容,支持线性四频带GSM/EDGE运作．为全球最广泛采用的移动通信标准进一步提升功率效能。     

一种新型提高射频功率放大器PAE的电路技术

提出了一种新型提高射频功率放大器功率附加效率(PAE)的电路技术,该方法通过滤除二次谐波分量、反射叠加三次谐波分量以提高电路PAE,分析了相位匹配的机制及其影响因素.基于该技术设计了一款功率放大器,仿真结果表明:工作频率为918 MHz时,该功放的P1dB达到了30.05 dBm,功率附加效率达到了58.75%,较普通...     

改善3G手机功放效率的方法

功率放大器是手机的重要组成部分,其效率是影响手机连续通话时间的重要因素。考虑第三代移动电话发射信号的特性,必须选用线性度较高的功放,这会限制功放效率。在不同输出信号功率下,功放效率将随信号的减小而下降。对于一些功放,在输出中小信号时,低功率偏压模式可改善功放效率。功放在低电压模式下具有较小的消耗电流,可以使用DC-DC电压变换器调整功放输入电压改善功放效率。     

高效率音频功率放大器的设计

本文主要介绍的是通过普通电子元件设计出高效率音频功率发大器的方法.它不仅能够减少电路的成本,同时还能够将放大器的效率给提高.该设计中的PWM电路是由基本的运算放大器所构成,从而形成了能满足高效率,低失真要求的D类功率放大器.     

Narrowband amplifier with excellent power combining efficiency

Based on a coaxial waveguide power-dividing/combining circuit, a four-device solid-state power amplifier with excellent power combining efficiency is presented. The fabricated power amplifier combining four monolithic microwave integrated circuit power amplifiers shows a 13-16.65 dB small-signal gain over a wide bandwidth of 7-13.5 GHz. The measured maximum output power at 1 dB compression is 25.4 dBm at 11 GHz, with a power-combining efficiency of 91%.     

LINC power amplifier combiner method efficiency optimization

Linear amplification using nonlinear components (LINC) is a method of vector summing two constant amplitude phase-modulated signals to achieve power amplification. The theoretical efficiency of the LINC power amplifier has been reported as 100% since highly efficient nonlinear constant amplitude amplifiers can be used. However, the 100% efficiency performance is only possible at one or two loads along the power output curve. The bulk of the papers regarding LINC has focused on clever implementations of the signal vector decomposition as well as methods to achieve highly linear signal separation. There has been little regard in the literature to the signal combiner implementation necessary to achieve the high power-added efficiency (PAE) of the LINC radio frequency (RF) power amplifier. Efficiency is not an intrinsic property of the combiner implementations, however, the combiner method is the single biggest contributor to efficient performance of a LINC RF power amplifier. This paper develops an analysis method that determines the efficiency of the LINC power amplifier as a function of the amplitude modulation statistics. This can be employed to design the RF communication system amplitude modulation characteristics and to tradeoff and optimize the RF transmitter PAE     

基于GaN的高效率功率放大器设计

基于Cree公司GaN HEMT设计了一款适用于3.45 GHz 5G通信的Doherty功率放大器,其中,载波放大器工作于深AB类,峰值放大器偏置于C类.后仿真表明该放大器小信号增益为13 dB,饱和输出功率大于44.85 dBm(30 W),在饱和点的功率附加效率(PAE)为73.5％.在6 dB回退点效率高达65...     

GaAs FET power amplifier module with high efficiency

A high-efficiency GaAs FET power amplifier having a total efficiency of 70% and an output power of 2 W is realised in the 900 MHz band. A drain efficiency of 80% was achieved at a low operation voltage of 6 V. These high efficiencies were obtained by using the even-order harmonic tuning of an output matching circuit. Important parameters for achieving this efficiency are also clarified.     

一款低功率下具有高效率的多模多频功率放大器

越来越多的移动通信协议要求射频功率放大器在低功率模式下具有高效率和低工作电流,为了满足这种需求,本文提出了一种全集成的多模多频射频功率放大器模块设计。本设计通过双路径的功率放大器实现了高功率、中功率和低功率三种模式,并且模块内部没有任何用于模式选择的串联开关。在不同功率模式下,通过最优化负载设计,不仅极大程度的降低了芯片的工作电流,而且实现了良好的工作性能。本设计采用InGaP/GaAs异质结双极晶体管工艺和0.18um的互补金属氧化物半导体工艺完成流片。芯片的实际测试结果显示在低功率模式下,该射频功率模块仅3mA的静态电流,并且在1.7-2.0 GHz带宽范围内高中低功率模式都实现了良好的射频性能,在高功率模式下,输出功率28dBm时,实现了至少39.4% 的功率附加效率和-40 dBc邻道泄漏比;在中功率模式下,输出功率17 dBm时,实现了至少21.3% 的功率附加效率和-43 dBc邻道泄漏比;在低功率模式下,输出功率8 dBm时,实现了至少18.2% 的功率附加效率和-40 dBc邻道泄漏比。     

A high efficiency PWM CMOS class-D audio power amplifier

Based on the difference close-loop feedback technique and the difference pre-amp, a high efficiency PWM CMOS class-D audio power amplifier is proposed. A rail-to-rail PWM comparator with window function has been embedded in the class-D audio power amplifier. Design results based on the CSMC 0.5 μm CMOS process show that the max efficiency is 90%, the PSRR is -75 dB, the power supply voltage range is 2.5-5.5 V, the THD+N in 1 kHz input frequency is less than 0.20%, the quiescent current in no load is 2.8 mA, and the shutdown current is 0.5 μA. The active area of the class-D audio power amplifier is about 1.47 × 1.52 mm2. With the good performance, the class-D audio power amplifier can be applied to several audio power systems.     

A power amplifier with efficiency improved using defected groundstructure

The authors report the effects of defected ground structure (DGS) on the output power and efficiency of a class-A power amplifier. In order to evaluate the effects of DGS on the efficiency and output power, two class-A GaAs FET amplifiers have been measured at 4.3~4.7 GHz. One of them has a 50 Ω microstrip line with DGS at the output section, while the other has only 50 Ω straight line. It is shown that DGS rejects the second harmonic at the output and yields improved output power and power added efficiency by 1~5%