基于0．25gm PHEMT工藝，給出了兩個高增益K 波段低噪聲放大器．放大器設(shè)計中采用了三級級聯(lián)增加?xùn)艑挼碾娐方Y(jié)構(gòu)，通過前級源極反饋電感的恰當(dāng)選取獲得較高的增益和較低的噪聲；采用直流偏置上加阻容網(wǎng)絡(luò)，用來消除低頻增益和振蕩；三級電路通過電阻共用一組正負(fù)電源，使用方便，且電路性能較好，輸入輸出駐波比小于2．0；功率增益達(dá)24dB；噪聲系數(shù)小于3．5dB．兩個放大器都有較高的動態(tài)范圍和較小的面積，放大器ldB壓縮點(diǎn)輸出功率大于15dBm；芯片尺寸為1mm×2mm×0．1mm．該放大器可以應(yīng)用在24GHz汽車?yán)走_(dá)前端和26．5GHz本地多點(diǎn)通信系統(tǒng)中．
上傳時間： 2014-12-23
上傳用戶：masochism
文章在分析電路噪聲、等效噪聲輸入帶寬和自動增益控制原理的基礎(chǔ)上, 介紹了一種低頻接收機(jī)自動增益控制電路的設(shè)計。
標(biāo)簽： 低頻接收機(jī) 自動增益 控制電路 分
上傳時間： 2014-12-23
上傳用戶：shfanqiwei
The LTC®1966 is a true RMS-to-DC converter that uses aDS computational technique to make it dramatically simplerto use, significantly more accurate, lower in powerconsumption and more flexible than conventional logantilogRMS-to-DC converters. The LTC1966 RMS-to-DCconverter has an input signal range from 5mVRMS to1.5VRMS (a 50dB dynamic range with a single 5V supplyrail) and a 3dB bandwidth of 800kHz with signal crestfactors up to four.
標(biāo)簽： 真有效值 轉(zhuǎn)換器 自動調(diào)節(jié)
上傳時間： 2013-10-12
上傳用戶：qilin
The LT®6552 is a specialized dual-differencing 75MHzoperational amplifier ideal for rejecting common modenoise as a video line receiver. The input pairs are designedto operate with equal but opposite large-signal differencesand provide exceptional high frequency commonmode rejection (CMRR of 65dB at 10MHz), therebyforming an extremely versatile gain block structure thatminimizes component count in most situations. The dualinput pairs are free to take on independent common modelevels, while the two voltage differentials are summedinternally to form a net input signal.
上傳時間： 2014-12-23
上傳用戶：13691535575
Precision 16-bit analog outputs with softwareconfigurableoutput ranges are often needed in industrialprocess control equipment, analytical and scientificinstruments and automatic test equipment. In the past,designing a universal output module was a daunting taskand the cost and PCB real estate associated with thisfunction were problematic, if not prohibitive.
上傳時間： 2014-12-23
上傳用戶：如果你也聽說
如AD9548數(shù)據(jù)手冊所述，AD9548的輸入端最多可支持八個獨(dú)立參考時鐘信號。八路輸入各有一個專用參考監(jiān)控器，判斷輸入?yún)⒖夹盘柕闹芷谑欠駶M足用戶要求。圖1是參考監(jiān)控器和必要支持元件的框圖。參考監(jiān)控器測量輸入?yún)⒖夹盘柕闹芷冢⒙暶餍盘柺沁^慢還是過快，即表示參考信號有誤。該信息保存在參考狀態(tài)寄存器內(nèi)(各參考監(jiān)控器具有用戶可讀取的專用狀態(tài)寄存器)。雖然參考監(jiān)控器將既不快也不慢的參考時鐘信號視為正確，但仍會通過AD9548參考驗(yàn)證邏輯進(jìn)一步審查。由于八個參考監(jiān)控器全部相同，圖1僅顯示其中之一。然而應(yīng)注意，所有八個參考監(jiān)控器共用相同的采樣時鐘和用戶提供的系統(tǒng)時鐘周期值(TSYS)。
上傳時間： 2014-12-23
上傳用戶：23333
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(biāo)簽： Transimpedance Stabilize Amplifier Your
上傳時間： 2013-11-13
上傳用戶：daoyue
關(guān)于相位噪聲專題的信息有很多，包括相位噪聲特性1、相位噪聲測量方法2以及它對系統(tǒng)性能的影響3。眾所周知，振蕩器和時鐘的相位噪聲已成為導(dǎo)致現(xiàn)代無線電系統(tǒng)性能降低的因素之一。然而，大多數(shù)傳統(tǒng)相位噪聲分析僅將重點(diǎn)放在單載波無線電系統(tǒng)中正弦波信號的降低，而相位噪聲對多載波接收機(jī)、寬帶系統(tǒng)或數(shù)字無線電的影響則很少涉及。本應(yīng)用筆記將討論一些與數(shù)據(jù)采樣系統(tǒng)相位噪聲有關(guān)的鮮為人知的問題，主要是多載波無線電、寬帶信號和欠采樣無線電架構(gòu)等
上傳時間： 2013-10-30
上傳用戶：asdkin
本應(yīng)用筆記說明ADE7878與ADE7880的區(qū)別，討論二者在硬件和軟件上的不同，并提供了一個用于ADE7880的頭文件。
上傳時間： 2013-10-29
上傳用戶：zhang_yi
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
標(biāo)簽： 半導(dǎo)體 運(yùn)放 穩(wěn)定性
上傳時間： 2013-10-28
上傳用戶：chenbhdt
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