- 关键词 光检测电路 SPICE模拟 稳定性 噪声特性光电二极管及其相关的前置放大器是基本物理量和电子量之间的桥梁.许多精密应用领域需要检测光亮度并将之转换为有用的数字信号.光检测电路可用于CT扫描仪,血液分析仪,烟雾检测器,位置传感器,红外高温计和色谱分析仪等系统中.在这些电路中,光电二极管产生一个与照明度成比例的微弱电流.而前置放大器将光电二极管传感器的电流输出信号转换为一个可用的电压信号.看起来好象用一个光电二极…大小：411KB免费软件中文版本： 电脑版
- 采用单片机为控制核心研制开发的JSQ-200型系列伺服放大器，增加了一些实用功能（如：断信号保护、过信号保护、堵转保护、电制动等），大大提高了设备的可靠性和安全性，同时有利于提高整套控制系统的调节品质。关键词：伺服放大器；单片机；保护；调节；堵转；电制动0、概述JSQ-200型系列伺服放大器（以下简称伺放）是电动执行机构的功率驱动单元。它接收调节器或远方操作器的控制信号和来自电动执行机构的位置反馈信号，根据两信…大小：88KB免费软件中文版本： 电脑版
- 【摘要】：本文介绍了直接数字频率合成器(DDS)的基本组成及设计原理,给出了基于FPGA的具体设计方案及编程实现方法。仿真结果表明,该设计简单合理,使用灵活方便,具有良好的性价比。【作者单位】： 东北大学秦皇岛分校 东北大学秦皇岛分校 东北大学秦皇岛分校 东北大学秦皇岛分校 东北大学秦皇岛分校 【关键词】： 直接数字频率合成器(DDS) FPGA 性价比 【分类号】：TN74【DOI】：CNKI:SUN:YQXB.0.2006-S1-340…大小：331KB共享软件中文版本： 电脑版
- 在目前世界能源供应日趋紧张,要求节能的呼声日益高涨的背景下,DVD作为一大块消费电子类产品的节能也不可避免的提到日程上来.安森美半导体所提出的DVD电源方案,既能符合最严格的待机功耗标准,而且也不会带来成本上涨的忧虑.本文介绍如何应用NCP1200P40来设计一个全范围输入,电路简单,所需外围器件少,成本低的DVD电源(如图一所示)一 正常模式 开机启动时,NCP1200由二极管D218从交流侧供电,经过IC8脚向电容C207以4mA速率充…大小：86KB共享软件中文版本： 电脑版
- 是一款非常简洁的VHF频段小功率电视发射机电原理图,曾生产多年深受使用者喜爱。 ... 完全按图1参数制作的发射机,只能工作于6频道以上,较低的频道将因各级 ...大小：542KB共享软件中文版本： 电脑版
- Analog Devices, Inc.,ADI数模转换器IC的设计方案,国模拟器件公司(AnalogDevices,Inc.,纽约证券交易所代码:ADI),全球领先的高性能信号处理应用解决方案供应商,今日在马萨诸塞州诺伍德市(Norwood,Mass.)发布具有内置14bit数模转换器(DAC)的直接数字频率合.大小：5.5M共享软件中文版本： 电脑版
- The AD8541/AD8542/AD8544 are single, dual, and quad rail-to-rail input and output single-supply amplifiers featuring very low supply current and 1 MHz bandwidth. All are guaranteed to operate from a 2.7 V single supply as well as a 5 V supply. These parts provide 1 MHz bandwidth at a low current consumption of 45 A per amplifier.Very low input bias currents enable the AD8541/AD8542/AD8544 to be us…大小：433KB共享软件中文版本：
- The AD8541/AD8542/AD8544 are single, dual, and quad rail-to-rail input and output single-supply amplifiers featuring very low supply current and 1 MHz bandwidth. All are guaranteed to operate from a 2.7 V single supply as well as a 5 V supply. These parts provide 1 MHz bandwidth at a low current consumption of 45 A per amplifier.Very low input bias currents enable the AD8541/AD8542/AD8544 to be us…大小：544KB共享软件中文版本：
- The SSM2167 is a complete and flexible solution for conditioning microphone inputs in personal electronics and computer audio systems. It is also excellent for improving vocal clarity in com-munications and public address systems. A low noise voltage controlled amplifier (VCA) provides a gain that is dynamically adjusted by a control loop to maintain a set compression characteristic. The compressi…大小：455KB共享软件中文版本：
- The SSM2211* is a high performance audio amplifier that delivers 1 W rms of low distortion audio power into a bridge-connected 8 speaker load (or 1.5 W rms into a 4 load).The SSM2211 operates over a wide temperature range and is specified for single-supply voltages between 2.7 V and 5.5 V. When operating from batteries, it continues to operate down to 1.75 V. This makes the SSM2211 the best choice…大小：423KB共享软件中文版本：
- The SSM2250 is intended for use in desktop computers that have basic audio functions. It is also ideal for any audio system that needs to provide both an internal monaural speaker and a stereo line or headphone output. Combined with an AC97 Codec, it provides a PC audio system that meets the PC98/99 requirements. The SSM2250 is compact and requires a minimum of external components.The SSM2250 feat…大小：522KB共享软件中文版本：
- The SSM2302 is a fully integrated, high efficiency, Class-D stereo audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.0 V supply. It is capable of delivering 1.4 W of continuous output power with less than 1% THD + N driving an 8 load from a 5.0 V supply.The S…大小：524KB共享软件中文版本：
- The SSM2315 features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modulation continues to provide high efficiency even at low output power. It operates with 93% efficiency at 1.4 W into 8 or 85% efficiency at 3 W into 3 from a 5.0 V supply and has an SNR of 103 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emis…大小：253KB共享软件中文版本：
- The SSM2019 is a latest generation audio preamplifier, combining SSM preamplifier design expertise with advanced processing. The result is excellent audio performance from a monolithic device, requiring only one external gain set resistor or potentiometer. The SSM2019 is further enhanced by unity gain stability.Key specifications include ultralow noise (1.5 dB noise figure) and THD (0.01% at G = 1…大小：452KB共享软件中文版本：
- The AD8541are single, dual, and quad rail-to-rail input and output single-supply amplifiers featuring very low supply current and 1 MHz bandwidth. All are guaranteed to operate from a 2.7 V single supply as well as a 5 V supply. These parts provide 1 MHz bandwidth at a low current consumption of 45 A per amplifier.Very low input bias currents enable the AD8541to be used for integrators, photodiode…大小：235KB共享软件中文版本：
- The SSM2141 is an integrated differential amplifier intended to receive balanced line inputs in audio applications requiring a high level of noise immunity and optimum common-mode rejection. The SSM2141 typically achieves 100 dB of common-mode rejection (CMR), whereas implementing an op amp with four off-the-shelf precision resistors will typically achieve only 40 dB of CMR-inadequate for high-per…大小：523KB共享软件中文版本：
- The SSM2142 is an integrated differential-output buffer amplifier that converts a single-ended input signal to a balanced output signal pair with high output drive. By utilizing low noise thermally matched thin film resistors and high slew rate amplifiers, the SSM2142 helps maintain the sonic quality of audio systems by eliminating power line hum, RF interference, voltage drops, and other external…大小：253KB共享软件中文版本：
- The SSM2160 and SSM2161 allow digital control of volume of six and four audio channels, respectively, with a master level control and individual channel controls. Low distortion VCAs (Voltage Controlled Amplifiers) are used in the signal path. By using controlled rate-of-change drive to the VCAs, the clicking associated with switched resistive networks is eliminated in the Master control. Each cha…大小：365KB共享软件中文版本：
- The SSM2143 is an integrated differential amplifier intended to receive balanced line inputs in audio applications requiring a high level of immunity from common-mode noise. The device provides a typical 90 dB of common-mode rejection (CMR), which is achieved by laser trimming of resistances to better than 0.005%.Additional features of the device include a slew rate of 10 V/s and wide bandwidth. T…大小：362KB共享软件中文版本：
- The SSM2166 integrates a complete and flexible solution for conditioning microphone inputs in computer audio systems. It is also excellent for improving vocal clarity in communications and public address systems. A low noise, voltage-controlled amplifier (VCA) provides a gain that is dynamically adjusted by a control loop to maintain a set compression characteristic. The compression ratio is set b…大小：265KB共享软件中文版本：
- The AAD7999 are 12-/10-/8-bit, low power, successive approximation ADCs with an I2C compatible interface. Each part operates from a single 2.7 V to 5.5 V power supply and features a 1 s conversion time. The track-and-hold amplifier allows each part to handle input frequencies of up to 14 MHz, and a multiplexer allows taking samples from four channels.The AD7999 normally remain in a shutdown state,…大小：325KB共享软件中文版本：
- The AD7468* are 12-/10-/8-bit, high speed, low power, successive approximation analog-to-digital converters (ADCs), respectively. The parts operate from a single 1.6 V to 3.6 V power supply and feature throughput rates up to 200 kSPS with low power dissipation. The parts contain a low noise, wide bandwidth track-and-hold amplifier, which can handle input frequencies in excess of 3 MHz.The conversi…大小：153KB共享软件中文版本：
- The AD7819 is a high speed, microprocessor-compatible, 8-bit analog-to-digital converter with a maximum throughput of 200 kSPS. The converter operates off a single +2.7 V to +5.5 V supply and contains a 4.5 s successive approximation A/D converter, track/hold circuitry, on-chip clock oscillator and 8-bit wide parallel interface. The parallel interface is designed to allow easy interfacing to micro…大小：235KB共享软件中文版本：
- The AD7823 is a high speed, low power, 8-bit A/D converter that operates from a single 2.7 V to 5.5 V supply. The part contains a 4.5 s successive approximation A/D converter, inherent track-and-hold functionality (with a pseudo differential input) and a high speed serial interface that interfaces to most microcontrollers. AD7823 is fully specified over a temperature range of -40C to +125C.By usin…大小：325KB共享软件中文版本：
- The AD7821 is a high-speed, 8-bit, sampling, analog-to-digital converter that offers improved performance over the popular AD7820. It offers a conversion time of 660 ns (vs. 1.36 s for the AD7820) and 100 kHz signal bandwidth (vs. 6.4 kHz). The sampling instant is better defined and occurs on the falling edge of WR of RD. The provision for a VSS pin (Pin 19) allows the part to operate from 5 V sup…大小：236KB共享软件中文版本：
- The AD7339 is a composite IC that contains both DAC and ADC functions. The device includes an 8-bit parallel A-to-D converter. Two 8-bit parallel DACs are also included as are two serial control DACs. These serial DACs are 8-bit DACs.The AD7339, which operates with a single 5 V power supply, has a bandgap reference on board with a nominal value of 2.5 V. To reduce the power consumption of the part…大小：235KB共享软件中文版本：
- The AD9281 is a complete dual channel, 28 MSPS, 8-bit CMOS ADC. The AD9281 is optimized specifically for applications where close matching between two ADCs is required (e.g., I/Q channels in communications applications). The 28 MHz sampling rate and wide input bandwidth will cover both narrow-band and spread-spectrum channels. The AD9281 integrates two 8-bit, 28 MSPS ADCs, two input buffer amplifi…大小：362KB共享软件中文版本：
- The AD9380 offers designers the flexibility of an analog interface and high definition multimedia interface (HDMI) receiver integrated on a single chip. Also included is support for high bandwidth digital content protection (HDCP).The AD9380 is a complete 8-bit, 150 MSPS, monolithic analog interface optimized for capturing component video (YPbPr) and RGB graphics signals. Its 150 MSPS encode rate …大小：235KB共享软件中文版本：
