共查询到20条相似文献,搜索用时 46 毫秒
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IRU3046是IR公司推出的一款集成有一个双路同步冲跳控制器和一个线性调节控制器的PWM控制器,该芯片可以为多输出应用系统提供高性能、低价位,灵活的电源解决方案,它具有两个相互独立的输出通道,并可利用外部元件对其开关频率和输出电压进行编辑设计,文中介绍了IRU3046的引脚功能、工作原理和设计要点,给出了IRU3046的典型应用电路。 相似文献
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视频设计常常被迫工作于可能的最低轨电压条件下,造成这一结果的原因很简单,就是逻辑电路供电电压日益降低的发展趋势,以及在任何可能的地方进行电源电压共享所带来的诸多好处。视频设计由于需要对AC耦合设计中所固有的随图像内容变化而产生的动态失调电压偏差进行调节而进一步复杂化了。 相似文献
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Tony Armstrong 《电子产品世界》2006,(F04):45-46
背景 高亮度(HB)和超高亮度LED通常充当LCDTFT背光,应用在高档电视、工业照明和投影仪中。另一个广泛应用的领域是许多轿车和卡车的仪表盘背光、内部照明和刹车灯。高级轿车制造商越来越多地采用固态LED照明的最新技术,通过这些更轻巧、更小型、更耐用的内部和外部照明器件来增加其2007-2008年新型汽车的美感。 相似文献
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基于反馈系统的闭环结构,采用全差分前置放大和全差分反馈结构,提出了一种高效率PWM CMOS D类音频功率放大器,并采用一种具有滞回结构Rail-to-Rail比较器作为PWM比较器,以保证良好的噪声性能。整个电路基于CSMC 0.5μm CMOS工艺进行实现,最大转换效率达到90%,电源电压范围为2.5-5.5V,1kHz下的THD+N小于0.20%,电源抑制比为-75dB,空载消耗电流为2.8mA,待机电流为0.5μA,有效芯片面积为1.47mm*1.52mm,最大功率可以达到2.5W,能应用于各种高效率中小功率音频放大系统。 相似文献
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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. 相似文献
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Chan C.C. Zheng Ming Zhao Qian C. Meng S. 《Industrial Electronics, IEEE Transactions on》2002,49(6):1342-1344
Based on the concepts of cascade multilevel converters and one-cycle technique, comparisons are conducted to characterize the distortion of the pulsewidth modulation (PWM) and one-cycle control methods that were applied to converters. Simulation results for the different control schemes are obtained in PSIM software initially to see the effect of one-cycle control different from that of PWM control. Through the comparisons, the advantages and disadvantages are identified for each method. The one-cycle scheme is better than PWM control in reducing undesirable harmonics and tracing dynamic waveforms. Simulation and experimental results are also provided to verify the conclusions. 相似文献
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Mar A. Helkey R. Bowers J. Mehuys D. Welch D. 《Photonics Technology Letters, IEEE》1994,6(9):1067-1069
We report the first mode-locked operation of a tapered amplifier MOPA to generate short optical pulses with record high average powers and pulse energies. The MOPA is constructed using a discrete semiconductor oscillator and amplifier operating at 940 mm wavelength. Pulses of 4.2 ps duration are generated with average powers of 296 mW and peak powers of 28.1 W. The energy of these pulses was 118 pJ, corresponding to energies more than an order magnitude greater than the gain saturation energy in the mode-locked laser itself, and also corresponds to energies internal in the amplifier in excess of the gain saturation energy. Although the amplifier saturation energy limits the pulse energy obtainable in a mode-locked laser, the MOPA configuration demonstrates that generation of pulses with energies in excess of the amplifier saturation energy is feasible in a post-amplification stage 相似文献
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一种应用于PWM D类音频功率放大器的CMOS Rail-to-Rail比较器 总被引:2,自引:0,他引:2
提出了一种应用于CMOS D类音频功率放大器的Rail-to-Rail PWM比较器,其输入级为Rail-to-Rail结构,输出级为AB类输出。基于CSMC 0.5μm CMOS工艺的BSIM3V3 Spice模型,采用Hspice对PWM比较器的特性进行了仿真,典型模型下的直流开环增益为50dB,电源抑制比为52dB,ICMR为0.04V~4.98V,传输时延为24.5ns,版图有效面积为210×75μm2。由于PWM比较器的良好性能参数,所以其不仅适用于D类音频功率放大器,也能应用于各类低频数据转换电路。 相似文献
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文章提出了一种新的调制技术,以提高数字脉冲宽度调制器(PWM)的电源纹波抑制。这种调制技术的特点是使用两个反馈点(开关节点和输出点),以使在相对低的开关频率下实现高增益和高带宽。由此能够得到高环路增益,提高电源纹波抑制比。通过系统仿真及实验测试证实,与理论分析基本一致。此技术可用于高性能要求的直流电源变换器及高保真音频功率放大器。 相似文献
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Two dimensional monolithically integrated master oscillator power amplifiers (M-MOPAs) have been fabricated that emit in a single longitudinal mode to an output power of greater than 4.5 W. The spectral output is a single longitudinal mode throughout the operating range and is identical to the output of the master oscillator. The far field radiation pattern transverse to the direction of propagation is characteristic of inphase diffraction limited operation at low output powers.<> 相似文献