Integrated Rail‐to‐Rail Low‐Voltage Low‐Power Enhanced DC‐Gain Fully Differential Operational Transconductance Amplifier

In this paper, we present an integrated rail‐to‐rail fully differential operational transconductance amplifier (OTA) working at low‐supply voltages (1.5 V) with reduced power consumption and showing high DC gain. An embedded adaptive biasing circuit makes it possible to obtain low stand‐by power dissipation (lower than 0.17 mW in the rail‐to‐rail version), while the high DC gain (over 78 dB) is ensured by positive feedback. The circuit, fabricated in a standard CMOS integrated technology (AMS 0.35 μm), presents a 37 V/μs slew‐rate for a capacitive load of 15 pF. Experimental results and high values of two quality factors, or figures of merit, show the validity of the proposed OTA, when compared with other OTA configurations.     

250 mV Supply Voltage Digital Low‐Dropout Regulator Using Fast Current Tracking Scheme

This paper proposes a 250 mV supply voltage digital low‐dropout (LDO) regulator. The proposed LDO regulator reduces the supply voltage to 250 mV by implementing with all digital circuits in a 0.11 μm CMOS process. The fast current tracking scheme achieves the fast settling time of the output voltage by eliminating the ringing problem. The over‐voltage and under‐voltage detection circuits decrease the overshoot and undershoot voltages by changing the switch array current rapidly. The switch bias circuit reduces the size of the current switch array to 1/3, which applies a forward body bias voltage at low supply voltage. The fabricated LDO regulator worked at 0.25 V to 1.2 V supply voltage. It achieved 250 mV supply voltage and 220 mV output voltage with 99.5% current efficiency and 8 mV ripple voltage at 20 μA to 200 μA load current.     

A 50‐mA 1‐nF Low‐Voltage Low‐Dropout Voltage Regulator for SoC Applications

In this paper, we present a low‐voltage low‐dropout voltage regulator (LDO) for a system‐on‐chip (SoC) application which, exploiting the multiplication of the Miller effect through the use of a current amplifier, is frequency compensated up to 1‐nF capacitive load. The topology and the strategy adopted to design the LDO and the related compensation frequency network are described in detail. The LDO works with a supply voltage as low as 1.2 V and provides a maximum load current of 50 mA with a drop‐out voltage of 200 mV: the total integrated compensation capacitance is about 40 pF. Measurement results as well as comparison with other SoC LDOs demonstrate the advantage of the proposed topology.     

Low‐Voltage Tunable Pseudo‐Differential Transconductor with High Linearity

A novel tunable transconductor is presented. Input transistors operate in the triode region to achieve programmable voltage‐to‐current conversion. These transistors are kept in the triode region by a novel negative feedback loop which features simplicity, low voltage requirements, and high output resistance. A linearity analysis is carried out which demonstrates how the proposed transconductance tuning scheme leads to high linearity in a wide transconductance range. Measurement results for a 0.5 μm CMOS implementation of the transconductor show a transconductance tuning range of more than a decade (15 μA/V to 165 μA/V) and a total harmonic distortion of ?67 dB at 1 MHz for an input of 1 V_pp and a supply voltage of 1.8 V.     

微波功率模块高压电源的设计

介绍了一种微波功率模块高压电源的设计方案,分析了其工作原理,并详细介绍了零电压开关多谐振变换模式、高压变压器和高压整流器等关键电路的设计。该高压电源具有小型化、高密度、高效率、高可靠性等优点。实验结果证明了该高压电源的优越性和实用性,能满足微波功率模块发射机的要求。     

开关电源中的前馈电压控制模式

开关电源的控制方法是电源设计中重要的一环。电压控制方式一直是其中重要的一种方式，它有着设计实现都非常简单的优点。文中介绍了前馈方式对电压控制模式的影响，对其控制的基本原理和性能进行了分析。     

Low‐Power Video Decoding on a Variable Voltage Processor for Mobile Multimedia Applications

This paper proposes a novel low‐power video decoding scheme. In the encoded video bitstream, there is quite a large number of non‐coded blocks. When the number of the non‐coded blocks in a frame is known at the start of frame decoding, the workload of the video decoding can be estimated. Consequently, the supply voltage of very large‐scale integration (VLSI) circuits can be lowered, and the power consumption can be reduced. In the proposed scheme, the encoder counts the number of non‐coded blocks and stores this information in the frame header of the bitstream. Simulation results show that the proposed scheme reduces the power consumption to about 1/10 to 1/20.     

一种高电源抑制比带隙基准电压源的设计

设计了一种基于反馈电路的基准电压电路。通过正、负两路反馈使输出基准电压获得了高交流电源抑制比(PSRR),为后续电路提供了稳定的电压。采用NPN型三极管,有效消除了运放失调电压对带隙基准电压精度产生的影响,并对电路进行温度补偿,大大减小了温漂。整个电路采用0.35μm CMOS工艺实现,通过spectre仿真软件在室温27℃、工作电压为4 V的条件下进行仿真,带隙基准的输出电压为1.28 V,静态电流为2μA,在-20~80℃范围内其温度系数约为18.9×10-6/℃,交流PSRR约为-107 dB。     

基于线性电源的高压放大器

介绍基于线性电源的高压放大器的实现，他具有宽范围的电压输出、波形质量好的特点，降低了对器件耐压的要求，可用于实现压电陶瓷驱动器、高电压扫描电源以及高压功率源等应用。     

Novel Low‐Power High‐dB Range CMOS Pseudo‐Exponential Cells

In this paper, novel CMOS pseudo‐exponential circuits operating in a class‐AB mode are presented. The pseudo‐exponential approximation employed is based on second order equations. Such terms are derived in a straightforward way from the inherent nonlinear currents of class‐AB transconductors. The cells are appropriate to be integrated in portable equipment due to their compactness and very low power consumption. Measurement results from a fabricated prototype in a 0.5 μm technology reveal a range of 45 dB with errors lower than ±0.5 dB, a power consumption of 100 μW, and an area of 0.01 mm².     

国外数据通信设备高压直流供电新系统（下）

分析了数据通信供电的特点,交直流供电系统的可靠性、安全性和工程应用,并对近十年来《国际电信能源会议》（INTELEC）中有关电信和数据通信局的高效节能、高压直流供电系统论文和实施试点进行跟踪,最后介绍了瑞典、日本、法国和美国等有关通信公司近几年来实施的不同系统结构的高压直流供电系统。     

国外数据通信设备高压直流供电新系统（上）

分析了数据通信供电的特点,交直流供电系统的可靠性、安全性和工程应用,并对近十年来《国际电信能源会议》（INTELEC）中有关电信和数据通信局的高效节能、高压直流供电系统论文和实施试点进行跟踪,最后介绍了瑞典、日本、法国和美国等有关通信公司近几年来实施的不同系统结构的高压直流供电系统。     

通信用高压直流供电技术的研究与探讨

从国内外研究直流供电代替交流UPS供电的不同出发点入手,分析了以提高节能效率和供电可靠性为目的的不同供电电压等级选择和系统设计思路,阐述了这两种直流供电系统的基本原理.通过对国内外直流供电技术供电可靠性、节能效率及安全性、投入产出的对比分析,论证了创新性地使用240 V直流供电技术的科学性和大规模推广的可行性.     

高频高压电源中倍压器的设计

倍压器作为高压电源的重要组成部分对于提高电源的性能具有特殊作用。分析了倍压器相关参数对电源性能的影响规律,用理论分析的方法设计了一种半臂式倍压器,并对其进行了实际测试。仿真与测试结果表明,倍压器参数优化对于电源性能具有显著影响,且实现了倍压器设计的优化。     

一种低功耗宽电源电压范围的电机驱动器北大核心

设计了一种低功耗、宽电源电压范围的电机驱动器。通过采用高效率泵电路，设计新型的电荷泵供电方式，使得电机驱动电路能够实现宽电源电压范围和低功耗。该驱动器保证功率管在低压下仍具有较低的导通电阻和较大的输出驱动电流，而在高压情况下功率管栅源不会被击穿。设计电荷泵时钟控制电路，使得驱动器具有更低的功耗。基于SMIC 180 nm BCD工艺完成设计。仿真结果表明，该电机驱动器的电机电源输入范围为0～15 V,逻辑电源范围为1.8～5.5 V,且静态功耗为284.5μA。     

A Single Transistor‐Level Direct‐Conversion Mixer for Low‐Voltage Low‐Power Multi‐band Radios

A CMOS direct‐conversion mixer with a single transistor‐level topology is proposed in this paper. Since the single transistor‐level topology needs smaller supply voltage than the conventional Gilbert‐cell topology, the proposed mixer structure is suitable for a low power and highly integrated RF system‐on‐a‐chip (SoC). The proposed direct‐conversion mixer is designed for the multi‐band ultra‐wideband (UWB) system covering from 3 to 7 GHz. The conversion gain and input P1dB of the mixer are about 3 dB and ?10 dBm, respectively, with multi‐band RF signals. The mixer consumes 4.3 mA under a 1.8 V supply voltage.     

用于雷达发射机的140kW高压开关电源

现代电力电子学技术的迅速发展和大功率开关器件的出现使开关稳压电源在中功率雷达发射机中得到了广泛应用。目前,由于ＩＧＢＴ模块的推广应用和新的拓看望 技术的不断涌现,高压大功率开关稳压电源已开妈在现代雷达发射机中使用。本文简单介绍了１４０ＫＷ大在电源在某空间目标测量雷达发射机中的应用和其工程设计考虑。     

Materials for Printable,Transparent, and Low‐Voltage Transistors

Since the 1990s, printable, transparent, and low‐voltage transistors have attracted great attention from academia and industry due to the demand for specialized circuitry such as in radio‐frequency identification (RFID) tags, medical sensors, and electronically active textiles. Some flexible and portable devices have been available commercially; however, the challenge to convert more conceptual devices into real‐life applications is still the materials. This article starts with a brief summary of some examples from silicon electronics, to place the other materials in context, followed by the topics including high‐capacitance dielectrics, transparent conductors and semiconductors, and printability of recently developed electronic materials. The recent progress about these topics is reviewed, and discussions of each topic suggest future science and engineering research opportunities.     

数据中心机房供电系统研究

通过分析网络服务器设备供电原理,重点研究了网络设备直流输入的可行性,结合当前高压直流电源供电实验情况,提出了数据中心机房高压直流供电系统供电方案。     

电子显微镜高压直流电源技术参数

随着高压直流电源技术的逐渐成熟,应用于工业、农业、航天、医疗等的领域越来越普及,对高压直流电源的技术参数的要求就越来越高,纹波大小和稳定度是影响高压直流电源质量的两个关键因素.本文设计了一台90KV/1mA的高压直流电源应用于电子显微镜以及曝光机等,现对其技术参数纹波大小和稳定度进行测量,介绍了纹波的测量方法以及影响稳定度的因素.