技术文章_第(2)页－康宝智信测量技术（北京）有限公司

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使用雙通道濾波器提高無線通信系統的性能

2023-05-10

在(zai)現代無(wu)線通(tong)信系統中(zhong)，信號(hao)質量的(de)提(ti)升和(he)干(gan)(gan)擾(rao)的(de)抑制是持續追求的(de)目標。無(wu)線信道中(zhong)存在(zai)的(de)多(duo)徑效(xiao)應(ying)、頻率(lv)選擇性(xing)衰落、以及與(yu)其他系統的(de)相互干(gan)(gan)擾(rao)，都會(hui)嚴重影響通(tong)信的(de)可靠性(xing)和(he)效(xiao)率(lv)。為了解決(jue)這些問題，雙通(tong)道濾波器的(de)應(ying)用被提(ti)上了日程，并顯示出了顯著的(de)性(xing)能改進(jin)。雙通(tong)道濾波器利(li)用兩個獨(du)立的(de)濾波路徑，可...

2023
10-11

直流電源校準器的操作與維護指南一、直流(liu)(liu)電(dian)源校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準器的(de)操(cao)(cao)作步驟：開啟(qi)設(she)備(bei)前，確保(bao)已經閱讀并理解了操(cao)(cao)作指南(nan)。打開直流(liu)(liu)電(dian)源校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準器，確保(bao)其正(zheng)常(chang)啟(qi)動并進入主界面。在主界面上(shang)，選擇“設(she)置”選項，然后選擇“電(dian)源校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準”或類似選項。在電(dian)源校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準界面上(shang)，選擇您要(yao)校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準的(de)直流(liu)(liu)電(dian)源類型。輸入您要(yao)校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準的(de)電(dian)源的(de)電(dian)壓(ya)和電(dian)流(liu)(liu)值，并根據需(xu)要(yao)進行(xing)負載條件設(she)置。啟(qi)動校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準過程，等待校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準結(jie)果。根據校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準結(jie)果，對直流(liu)(liu)電(dian)源進行(xing)調(diao)整或維修。二、直流(liu)(liu)電(dian)源校(xiao)(xiao)(xiao)(xiao)(xiao)(xiao)準器的(de)維護(hu)指南(nan)：設(she)備(bei)應定(ding)期(qi)進行(xing)清潔，以保(bao)持其良好(hao)的(de)工作狀態。定(ding)期(qi)檢查設(she)備(bei)的(de)電(dian)源線、接口和連(lian)接是否完好(hao)無(wu)損。對...
2023
9-21

寬帶功率放大器的性能指標與評估方法寬帶功(gong)(gong)(gong)率放(fang)大(da)器(qi)的(de)(de)(de)(de)性能指標(biao)與評估方(fang)法主要(yao)包括以下(xia)幾個方(fang)面：額定(ding)輸(shu)出(chu)(chu)功(gong)(gong)(gong)率：這是指在一定(ding)的(de)(de)(de)(de)諧波失(shi)真(zhen)(zhen)指標(biao)內，寬帶功(gong)(gong)(gong)放(fang)輸(shu)出(chu)(chu)的(de)(de)(de)(de)最大(da)功(gong)(gong)(gong)率。一般(ban)來(lai)說，功(gong)(gong)(gong)放(fang)的(de)(de)(de)(de)負(fu)載和(he)諧波失(shi)真(zhen)(zhen)指標(biao)不同，額定(ding)輸(shu)出(chu)(chu)功(gong)(gong)(gong)率也會(hui)有所不同。通(tong)常采用連續正弦(xian)波作(zuo)為測(ce)量(liang)信(xin)號，給(gei)功(gong)(gong)(gong)放(fang)輸(shu)入頻率為1000Hz的(de)(de)(de)(de)正弦(xian)信(xin)號，測(ce)出(chu)(chu)等阻負(fu)載電(dian)阻上的(de)(de)(de)(de)電(dian)壓有效值(zhi)V，計算(suan)出(chu)(chu)功(gong)(gong)(gong)放(fang)的(de)(de)(de)(de)輸(shu)出(chu)(chu)功(gong)(gong)(gong)率P，即P=V^2/RL，這里的(de)(de)(de)(de)RL為揚聲器(qi)的(de)(de)(de)(de)阻抗(kang)。當(dang)(dang)音(yin)量(liang)逐漸開大(da)時，功(gong)(gong)(gong)放(fang)開始過載，波形削頂，諧波失(shi)真(zhen)(zhen)加大(da)。當(dang)(dang)諧波失(shi)真(zhen)(zhen)為10%時的(de)(de)(de)(de)平均功(gong)(gong)(gong)率，稱(cheng)為額定(ding)輸(shu)出(chu)(chu)功(gong)(gong)(gong)率，又稱(cheng)最大(da)...
2023
8-9

如何安全使用功率放大器由于功(gong)(gong)(gong)率放大(da)器(qi)(qi)通常進行負載的(de)驅(qu)動，而負載的(de)特(te)性的(de)復雜，決定了我們(men)使用功(gong)(gong)(gong)率放大(da)器(qi)(qi)的(de)風險，如果(guo)安(an)全(quan)的(de)使用功(gong)(gong)(gong)率放大(da)器(qi)(qi)需要注(zhu)意(yi)的(de)問題。1、選擇(ze)合適功(gong)(gong)(gong)率的(de)放大(da)器(qi)(qi)，對于待輸入信號(hao)進行預(yu)估(gu)電壓電流、功(gong)(gong)(gong)率、頻率、波形等(參見如何選擇(ze)功(gong)(gong)(gong)率放大(da)器(qi)(qi))。2、保證(zheng)功(gong)(gong)(gong)率放大(da)器(qi)(qi)安(an)全(quan)接(jie)(jie)地。3、查看說明書(shu)看廠家對應產品是(shi)否支持(chi)長時間連(lian)續工(gong)作能力。4、注(zhu)意(yi)儀器(qi)(qi)的(de)散(san)熱。5、前端連(lian)接(jie)(jie)線的(de)穩定可靠，防止短路(lu)發生。6、信號(hao)源輸入信號(hao)再安(an)全(quan)范圍之內。Krohn-Hite公(gong)司(si)的(de)Model7500是(shi)較(jiao)早的(de)一(yi)個直接(jie)(jie)耦合的(de)寬帶功(gong)(gong)(gong)...
2023
8-3

直流電源校準器的主要功能和應用直流電(dian)(dian)源(yuan)校(xiao)準器是(shi)一種專(zhuan)業設備，用于校(xiao)準和測試直流電(dian)(dian)源(yuan)的(de)(de)輸(shu)出(chu)精(jing)(jing)度和穩(wen)定性(xing)。它能夠模擬不同負(fu)載條(tiao)件(jian)下(xia)的(de)(de)電(dian)(dian)壓(ya)和電(dian)(dian)流，通(tong)(tong)過(guo)(guo)(guo)比較校(xiao)準儀和待校(xiao)準電(dian)(dian)源(yuan)之間的(de)(de)差異，確定電(dian)(dian)源(yuan)輸(shu)出(chu)是(shi)否符(fu)合標準要求。電(dian)(dian)源(yuan)校(xiao)準器通(tong)(tong)常(chang)由控制單(dan)元、校(xiao)準模塊和顯示屏等組成，用戶可以通(tong)(tong)過(guo)(guo)(guo)界面操作來完(wan)成校(xiao)準過(guo)(guo)(guo)程。主要功(gong)能校(xiao)準精(jing)(jing)度高：可以提供非常(chang)高的(de)(de)校(xiao)準精(jing)(jing)度，通(tong)(tong)常(chang)在微伏至千伏的(de)(de)電(dian)(dian)壓(ya)范圍內(nei)，微安至千安的(de)(de)電(dian)(dian)流范圍內(nei)進行校(xiao)準。它能夠模擬各種負(fu)載條(tiao)件(jian)下(xia)的(de)(de)輸(shu)出(chu)，并通(tong)(tong)過(guo)(guo)(guo)精(jing)(jing)確的(de)(de)測量和比較，確保(bao)電(dian)(dian)源(yuan)輸(shu)出(chu)的(de)(de)準確性(xing)。穩(wen)定性(xing)強：能夠提供高穩(wen)定性(xing)的(de)(de)電(dian)(dian)...
2023
7-25

功率放大器為什么要關注阻抗匹配問題？如何進行阻抗匹配？功率(lv)放(fang)大(da)(da)(da)器的(de)(de)(de)匹(pi)(pi)配(pei)(pei)方(fang)法(fa)在(zai)(zai)線(xian)性網(wang)(wang)絡(luo)設計中(zhong)，為(wei)獲得最大(da)(da)(da)功率(lv)傳(chuan)輸(shu)(shu)，網(wang)(wang)絡(luo)通(tong)常采用(yong)共(gong)軛(e)阻抗匹(pi)(pi)配(pei)(pei)方(fang)式，但由于(yu)功率(lv)放(fang)大(da)(da)(da)器輸(shu)(shu)入(ru)、輸(shu)(shu)出(chu)(chu)阻抗呈現(xian)非線(xian)性，不(bu)可(ke)(ke)能實現(xian)共(gong)軛(e)匹(pi)(pi)配(pei)(pei)，通(tong)常是將50Ω負載變換(huan)到這樣一(yi)個阻抗值，其實部(bu)可(ke)(ke)在(zai)(zai)輸(shu)(shu)入(ru)、輸(shu)(shu)出(chu)(chu)偏置電壓下獲得最大(da)(da)(da)輸(shu)(shu)出(chu)(chu)功率(lv)，其虛(xu)部(bu)可(ke)(ke)以(yi)將晶(jing)體管內部(bu)寄(ji)生元件調諧掉，該網(wang)(wang)絡(luo)變換(huan)成的(de)(de)(de)阻抗稱為(wei)最佳(jia)負載阻抗，也(ye)稱為(wei)動態輸(shu)(shu)出(chu)(chu)阻抗。由于(yu)功率(lv)放(fang)大(da)(da)(da)器工作于(yu)非線(xian)性，小(xiao)信號放(fang)大(da)(da)(da)器的(de)(de)(de)網(wang)(wang)絡(luo)設計方(fang)法(fa)不(bu)再(zai)適用(yong)。通(tong)常采用(yong)以(yi)下三(san)種方(fang)法(fa)來設計功率(lv)放(fang)大(da)(da)(da)器的(de)(de)(de)匹(pi)(pi)配(pei)(pei)網(wang)(wang)絡(luo)：動態阻抗法(fa)、大(da)(da)(da)信號S參數法(fa)和負載牽引...
2023
6-21

插座電源濾波器怎么選擇呢必須在電(dian)(dian)(dian)子設備的(de)(de)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)線(xian)上安裝濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)。電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)允許設備使用(yong)電(dian)(dian)(dian)力通(tong)(tong)過(guo)，防(fang)(fang)止過(guo)多的(de)(de)干(gan)擾(rao)能量通(tong)(tong)過(guo)。電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)是一種雙(shuang)向裝置，既能防(fang)(fang)止外界干(gan)擾(rao)進入(ru)(ru)裝置，又能防(fang)(fang)止干(gan)擾(rao)沿(yan)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)線(xian)傳輸。因此，電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)對于傳導(dao)發射、輻(fu)射發射、傳導(dao)靈敏(min)度(du)和輻(fu)射敏(min)感(gan)性(xing)測試的(de)(de)順利通(tong)(tong)過(guo)是不可少的(de)(de)。電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)的(de)(de)效果用(yong)插入(ru)(ru)損(sun)耗來表示，它類似于屏蔽(bi)材料的(de)(de)屏蔽(bi)效能，它是指濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)流過(guo)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)的(de)(de)信號電(dian)(dian)(dian)流的(de)(de)損(sun)耗程度(du)，以dB表示。所(suo)(suo)有的(de)(de)電(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)都(dou)是低通(tong)(tong)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)。所(suo)(suo)謂低通(tong)(tong)濾(lv)(lv)(lv)(lv)(lv)波(bo)器(qi)(qi)(qi)(qi)，低頻插入(ru)(ru)損(sun)耗很(hen)小，允許低頻電(dian)(dian)(dian)流通(tong)(tong)過(guo)，高頻插入(ru)(ru)損(sun)耗大，防(fang)(fang)止...
2023
5-17

什么是寬帶功率放大器？性能如何？一、產品描(miao)述Krohn-Hite公司(si)的(de)(de)(de)Model7500是較早的(de)(de)(de)一個直接耦合的(de)(de)(de)寬帶功(gong)率(lv)放(fang)大器(qi)，提供(gong)了擴展的(de)(de)(de)輸出(chu)功(gong)率(lv)和電壓(ya)能力，低(di)失真度，先進(jin)的(de)(de)(de)全固態設計，以(yi)(yi)及杰出(chu)的(de)(de)(de)性能特點。7500提供(gong)了超過75W的(de)(de)(de)連續功(gong)率(lv)(150W直流)，從直流到(dao)100kHz情況下為125Vrms。在大部分范圍內，7500的(de)(de)(de)頻率(lv)響應通(tong)常持(chi)平，誤(wu)差(cha)小于0.05dB。此外(wai)，7500的(de)(de)(de)總諧波失真度通(tong)常小于0.05%，以(yi)(yi)高達10kHz的(de)(de)(de)全功(gong)率(lv)輸出(chu)。7500的(de)(de)(de)電壓(ya)增益是非反相的(de)(de)(de)，并可以(yi)(yi)選擇固定(ding)增益為20dB(10)...

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