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計算FR4上的差分阻抗(PDF)

Calculation of the Differential Impedance of Tracks on FR4 substrates There is a discrepancy between calculated and measured values of impedance for differential transmission lineson FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown tobe due to the nature of the substrate material. This needs to be considered as a layered structure of epoxy resinand glass fibre. Calculations, using Boundary Element field methods, show that the distribution of the electricfield within this layered structure determines the apparent dielectric constant and therefore affects theimpedance. Thus FR4 cannot be considered to be uniform dielectric When calculating differential impedance.

標簽： FR4 計算差分阻抗

上傳時間： 2014-12-24

上傳用戶：DE2542
LED的電源管理

A light-emitting diode (LED) is a semiconductor device that emits narrow-spectrum incoherent light When forward-biased.The color of the emitted light depends on the chemical composition of the semiconductor material used, and can benear-ultraviolet, visible or infrared. LEDs are more prevalent today than ever before, replacing traditional incandescent andfluorescent bulbs in many lighting applications. Incandescents use a heated filament, are subject to breakage and burnoutand operate at a luminous efficiency of 2% to 4%. Fluorescents are more efficient, at 7% to 12%, but require highdrive voltage and contain mercury, a toxic substance that may be eventually banned in certain countries. LEDs, however,produce light directly through electroluminescence, operate at low voltage and can deliver over 20% luminous efficiency.

標簽： LED 電源管理

上傳時間： 2013-11-07

上傳用戶：xiaoyuer
為您的FPGA選擇合適的電源

Abstract: There are many things to consider When designing a power supply for a field-programmablegate array (FPGA). These include (but are not limited to) the high number of voltage rails, and thediffering requirements for both sequencing/tracking and the voltage ripple limits. This application noteexplains these and other power-supply considerations that an engineer must think through Whendesigning a power supply for an FPGA.

標簽： FPGA 電源

上傳時間： 2013-11-12

上傳用戶：金苑科技
電感開關穩壓器提高輸入電壓

Abstract: Uses the MAX641 switching controller and an external discrete charge pump to step up the input voltage. This circuitcan service low loads and is efficient When the output is two, three, four times the input voltage. Adding the MAX627 MOSdriver can further increase the output current capability.

標簽： 電感開關穩壓器輸入電壓

上傳時間： 2013-11-15

上傳用戶：zwei41
電源調整與虛擬地

Abstract: Rail splitting is creating an artificial virtual ground as a reference voltage. It is used to set the signalto match the op amp's "sweet spot." An op amp has the most linear- and distortion-free qualities at that sweetspot. Typically, the sweet spot occurs near the center between the single power rail and ground. In the case ofa number of signals, the virtual ground can control channel DC errors When multiplexing or switching thesignals.

標簽： 電源調整虛擬地

上傳時間： 2013-10-23

上傳用戶：wushengwu
如何保護集成FET的電源開關

Abstract: Some types of loads require more current during startup than When running. Other loads can be limited to a lower-powercurrent during startup but require a higher operating current. This article describes an application circuit that automatically adjusts apower circuit’s overcurrent protection level up or down after startup is complete.

標簽： FET 保護集成電源開關

上傳時間： 2013-10-23

上傳用戶：swaylong
XAPP946-適用于Virtex-4 RocketIO MGT的開關電源

This document presents design techniques and reference circuits that power Virtex™-4 FXRocketIO™ multi-gigabit transceivers (MGTs) operating at data rates below 3.125 Gb/s.When using multiple transceivers, it is sometimes preferred to power them from a switchingpower supply. However, switching power supplies generate noise that affects transceiver

標簽： RocketIO Virtex XAPP 946

上傳時間： 2013-11-18

上傳用戶：huang111
電池管理系統的多點溫度測量方案

Abstract: It is critically important that lithium-ion battery stacks have a good battery-management system for monitoring many cellvoltages and cell temperatures. Without that monitoring, thermal runaway can lead to a battery explosion. This design idea presentsa low-power circuit that measures the temperature of up to 12 thermistors. It powers and configures the multiplexers, and also putsthe muxes into shutdown to save power When not measuring temperatures.

標簽： 電池管理系統多點溫度測量方案

上傳時間： 2013-10-29

上傳用戶：xwd2010
100-15V TO 12V DCDC 原理圖 PCB BOM表

高的工作電壓高達100V N雙N溝道MOSFET同步驅動 The D810DCDC is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The D810DCDC uses a constant on-time valley current control architecture to deliver very low duty cycles with accurate cycle-by-cycle current limit, without requiring a sense resistor. A precise internal reference provides 0.5% DC accuracy. A high bandwidth (25MHz) error amplifi er provides very fast line and load transient response. Large 1Ω gate drivers allow the D810DCDC to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. Integrated bias control generates gate drive power from the input supply during start-up and When an output shortcircuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher effi ciency.

標簽： DCDC 100 12V BOM

上傳時間： 2013-10-24

上傳用戶：wd450412225
使用5V電源的高分辨率視頻解決方案

Video cable driver amplifi er output stages traditionallyrequire a supply voltage of at least 6V in order to providethe required output swing. This requirement is usuallymet with 5V supplies by adding a boost regulator or asmall local negative rail, say via the popular LT®1983-3.Such additional circuitry is unnecessary in typical 1VP-Pvideo connections, such as HD component video, if thecable driver amplifi ers simply offer near rail-to-rail outputcapability When powered from 5V.

標簽： 5V電源高分辨率視頻解決方案

上傳時間： 2013-11-16

上傳用戶：yanyangtian