Abstract: This application note presents an overview of the Operational characteristics of accurate I²C real-time clocks (RTCs),including the DS3231, DS3231M, and DS3232. It focuses on general application guidelines that facilitate use of device resources forpower management, I²C communication circuit configurations, and I²C characteristics relative to device power-up sequences andinitializations. Additional discussions on decoupling are provided to support developing strategies for mitigating power-supply pushingof device frequency.
上傳時間： 2013-11-23
上傳用戶：WMC_geophy
Abstract: Transimpedance amplifiers (TIAs) are widely used to translate the current output of sensors like photodiode-to-voltagesignals, since several circuits and instruments can only accept voltage input. An Operational amplifier with a feedback resistor fromoutput to the inverting input is the most straightforward implementation of such a TIA. However, even this simple TIA circuit requirescareful trade-offs among noise gain, offset voltage, bandwidth, and stability. Clearly stability in a TIA is essential for good, reliableperformance. This application note explains the empirical calculations for assessing stability and then shows how to fine-tune theselection of the feedback phase-compensation capacitor.
標簽： Transimpedance Stabilize Amplifier Your
上傳時間： 2013-11-13
上傳用戶：daoyue
Who has never experienced oscillations issues when using an Operational amplifier? Opampsare often used in a simple voltage follower configuration. However, this is not the bestconfiguration in terms of capacitive loading and potential risk of oscillations.Capacitive loads have a big impact on the stability of Operational amplifier-basedapplications. Several compensation methods exist to stabilize a standard op-amp. Thisapplication note describes the most common ones, which can be used in most cases.The general theory of each compensation method is explained, and based on this, specific
上傳時間： 2013-10-28
上傳用戶：chenbhdt
模擬集成電路的設計與其說是一門技術，還不如說是一門藝術。它比數字集成電路設計需要更嚴格的分析和更豐富的直覺。嚴謹堅實的理論無疑是嚴格分析能力的基石，而設計者的實踐經驗無疑是誕生豐富直覺的源泉。這也正足初學者對學習模擬集成電路設計感到困惑并難以駕馭的根本原因。.美國加州大學洛杉機分校(UCLA)Razavi教授憑借著他在美國多所著名大學執教多年的豐富教學經驗和在世界知名頂級公司(AT&T，Bell Lab，HP)卓著的研究經歷為我們提供了這本優秀的教材。本書自2000午出版以來得到了國內外讀者的好評和青睞，被許多國際知名大學選為教科書。同時，由于原著者在世界知名頂級公司的豐富研究經歷，使本書也非常適合作為CMOS模擬集成電路設計或相關領域的研究人員和工程技術人員的參考書。... 本書介紹模擬CMOS集成電路的分析與設計。從直觀和嚴密的角度闡述了各種模擬電路的基本原理和概念，同時還闡述了在SOC中模擬電路設計遇到的新問題及電路技術的新發展。本書由淺入深，理論與實際結合，提供了大量現代工業中的設計實例。全書共18章。前10章介紹各種基本模塊和運放及其頻率響應和噪聲。第11章至第13章介紹帶隙基準、開關電容電路以及電路的非線性和失配的影響，第14、15章介紹振蕩器和鎖相環。第16章至18章介紹MOS器件的高階效應及其模型、CMOS制造工藝和混合信號電路的版圖與封裝。 1 Introduction to Analog Design 2 Basic MOS Device Physics 3 Single-Stage Amplifiers 4 Differential Amplifiers 5 Passive and Active Current Mirrors 6 Frequency Response of Amplifiers 7 Noise 8 Feedback 9 Operational Amplifiers 10 Stability and Frequency Compensation 11 Bandgap References 12 Introduction to Switched-Capacitor Circuits 13 Nonlinearity and Mismatch 14 Oscillators 15 Phase-Locked Loops 16 Short-Channel Effects and Device Models 17 CMOS Processing Technology 18 Layout and Packaging
上傳時間： 2014-12-23
上傳用戶：杜瑩12345
Abstract: We can apply a BiCMOS integrated circuit with only resistors and no transistors to solve adifficult design problem. The mythically perfect Operational amplifier's gain and temperature coefficient aredependent on external resistor values. Maxim precision resistor arrays are manufactured together on asingle die and then automatically trimmed, to ensure close ratio matching. This guarantees that theOperational amplifier (op amp) gain and temperature coefficient are predictable and reliable, even withlarge production volumes.
上傳時間： 2014-11-30
上傳用戶：ynzfm
The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic devices which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be Operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The bit rate for normal communications is typically 33 kbit/s, forhigh-speed transmissions like described above a typical bit rate of83 kbit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.
上傳時間： 2013-10-24
上傳用戶：s藍莓汁
為了能夠滿足基站易于選址、優質快速的建站要求和易維護、低成本、高可靠的運行要求，本文對以方艙來實現一體化結構基站做出一番探討。從系統設計的觀點闡述了移動通信高性能基站天線設計的幾個關鍵問題，介紹了智能天線技術在基站中的應用，并且用HFSS軟件仿真了一種新型的對稱陣子天線，該天線駐波比小于2的帶寬可以達到60%，具有良好的寬頻帶特性。 Abstract: In order to meet the station construction requirement of easy site selection and fast base station， and meet the Operational requirement of easy maintenance， low cost and high reliability， this paper discussed the unified architecture base station using shelter. Several key problems of high performance mobile communication base station antenna were illustrated from the view of system design， the application of smart antenna in base station was also introduced. And a novel dipole antenna was simulated by using HFSS， the VSWR of the antenna is less than 2， and the bandwidth was reach to 60%. So it has good broadband properties.
上傳時間： 2013-11-20
上傳用戶：linlin
在Multisim 10軟件環境下，設計一種由運算放大器構成的精確可控矩形波信號發生器，結合系統電路原理圖重點闡述了各參數指標的實現與測試方法。通過改變RC電路的電容充、放電路徑和時間常數實現了占空比和頻率的調節，通過多路開關投入不同數值的電容實現了頻段的調節，通過電壓取樣和同相放大電路實現了輸出電壓幅值的調節并提高了電路的帶負載能力，可作為頻率和幅值可調的方波信號發生器。Multisim 10仿真分析及應用電路測試結果表明，電路性能指標達到了設計要求。 Abstract: Based on Multisim 10， this paper designed a kind of rectangular-wave signal generator which could be controlled exactly composed of Operational amplifier， the key point was how to implement and test the parameter indicators based on the circuit diagram. The duty and the frequency were adjusted by changing the time constant and the way of charging and discharging of the capacitor， the width of frequency was adjusted by using different capacitors provided with multiple switch， the amplitude of output voltage was adjusted by sampling voltage and using in-phase amplifier circuit，the ability of driving loads was raised， the circuit can be used as squarewave signal generator whose frequency and amplitude can be adjusted. The final simulation results of Multisim 10 and the tests of applicable circuit show that the performance indicators of the circuit meets the design requirements.
上傳時間： 2014-01-21
上傳用戶：shen007yue
The LM158 series consists of two independent, high gain, internally frequency compensated Operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage.
標簽： compensated independent internally frequency
上傳時間： 2014-01-09
上傳用戶：zwei41
A stochastic-flow network consists of a set of nodes, including source nodes which supply various resources and sink nodes at which resource demands take place, and a collection of arcs whose capacities have multiple Operational states.
標簽： nodes stochastic-flow including consists
上傳時間： 2013-12-22
上傳用戶：wlcaption
