75dBuv等于多少dBm
1w\u7b49\u4e8e\u591a\u5c11dbm?\u5c06dBm\u8f6c\u6362\u4e3aW\u7684\u53e3\u7b97\u65b9\u6cd5
dBm\u662f\u4e00\u4e2a\u8868\u793a\u529f\u7387\u7edd\u5bf9\u503c\u7684\u503c\uff08\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4ee51mW\u529f\u7387\u4e3a\u57fa\u51c6\u7684\u4e00\u4e2a\u6bd4\u503c\uff09\uff0c\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a10log\uff08\u529f\u7387\u503c/1mw\uff09\u3002
\u3000\u3000\u8fd9\u91cc\u5c06dBm\u8f6c\u6362\u4e3aW\u7684\u53e3\u7b97\u89c4\u5f8b\u662f\u8981\u5148\u8bb0\u4f4f\u201c1\u4e2a\u57fa\u51c6\u201d\u548c\u201c2\u4e2a\u539f\u5219\u201d\uff1a
\u3000\u3000\u201c1\u4e2a\u57fa\u51c6\u201d\uff1a
\u3000\u300030dBm\uff1d1W
\u3000\u3000\u201c2\u4e2a\u539f\u5219\u201d\uff1a
\u3000\u30001)\uff0b3dBm\uff0c\u529f\u7387\u4e582\u500d\uff1b\uff0d3dBm\uff0c\u529f\u7387\u4e581/2
\u3000\u3000\u4e3e\u4f8b\uff1a33dBm\uff1d30dBm+3dBm\uff1d1W\u00d72=2W
\u3000\u3000\u3000\u3000\u300027dBm\uff1d30dBm\uff0d3dBm\uff1d1W\u00d71/2=0.5W
\u3000\u30002)\uff0b10dBm\uff0c\u529f\u7387\u4e5810\u500d\uff1b\uff0d10dBm\uff0c\u529f\u7387\u4e581/10
\u3000\u3000\u4e3e\u4f8b\uff1a40dBm\uff1d30dBm+10dBm\uff1d1W\u00d710=10W
\u3000\u3000\u3000\u3000\u300020dBm\uff1d30dBm\uff0d10dBm\uff1d1W\u00d70.1=0.1W
\u3000\u3000\u4ee5\u4e0a\u53ef\u4ee5\u7b80\u5355\u7684\u8bb0\u4f5c\uff1a30\u662f\u57fa\u51c6\uff0c\u7b49\u4e8e1W\u6574\uff0c\u4e92\u6362\u4e0d\u7b97\u96be\uff0c\u53e3\u7b97\u53ef\u5b8c\u6210\u3002\u52a03\u4e58\u4ee52\uff0c\u52a010\u4e58\u4ee510\uff1b\u51cf3\u9664\u4ee52\uff0c\u51cf10\u9664\u4ee510\u3002
\u3000\u3000\u51e0\u4e4e\u6240\u6709\u6574\u6570\u7684dBm\u90fd\u53ef\u7528\u4ee5\u4e0a\u7684\u201c1\u4e2a\u57fa\u51c6\u201d\u548c\u201c2\u4e2a\u539f\u5219\u201d\u8f6c\u6362\u4e3aW\u3002
\u3000\u3000\u4f8b1\uff1a44dBm=?W
\u3000\u3000\u3000\u3000 44dBm=30dBm+10dBm+10dBm\uff0d3dBm\uff0d3dBm
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=1W\u00d710\u00d710\u00d71/2\u00d71/2
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=25W
\u3000\u3000\u4f8b2\uff1a32dBm=?W
\u3000\u3000\u3000\u3000 32dBm=30dBm+3dBm+3dBm+3dBm+3dBm\uff0d10dBm
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=1W\u00d72\u00d72\u00d72\u00d72\u00d70.1
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=1.6W
\u3000\u3000\u8ba1\u7b97\u6280\u5de7\uff1a
\u3000\u3000+1dBm\u548c+2dBm\u7684\u8ba1\u7b97\u6280\u5de7
\u3000\u3000+1dBm=+10dBm\uff0d3dBm\uff0d3dBm\uff0d3dBm
\u3000\u3000\u3000\u3000\u3000=X\u00d710\u00d71/2\u00d71/2\u00d71/2
\u3000\u3000\u3000\u3000\u3000=X\u00d71.25
\u3000\u3000+2dBm=\uff0d10dBm+3dBm+3dBm+3dBm+3dBm
\u3000\u3000\u3000\u3000\u3000=X\u00d70.1\u00d72\u00d72\u00d72\u00d72
\u3000\u3000\u3000\u3000\u3000=X\u00d71.6
\u3000\u3000\u5728\u8ba1\u7b97\u4e2d\uff0c\u6709\u65f6\u5019\u4e5f\u53ef\u4ee5\u6839\u636e\u4e0a\u9762\u7684\u89c4\u5f8b\u53d8\u6362\u4e3a\uff0d1dBm\u548c\uff0d2dBm\uff0c\u8fbe\u5230\u5feb\u901f\u53e3\u901f\u7684\u76ee\u7684\uff0c\u5373\uff1a
\u3000\u3000\uff0d1dBm=\uff0d10dBm+3dBm+3dBm+3dBm
\u3000\u3000\u3000\u3000\u3000=X\u00d70.1\u00d72\u00d72\u00d72
\u3000\u3000\u3000\u3000\u3000=X\u00d70.8
\u3000\u3000\uff0d2dBm=\uff0d3dBm+1dBm
\u3000\u3000\u3000\u3000\u3000=X\u00d71/2\u00d71.25
\u3000\u3000\u3000\u3000\u3000=X\u00d70.625
\u3000\u3000\u4f8b3\uff1a51dBm=30dBm+10dBm+10dBm+1dBm
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=1W\u00d710\u00d710\u00d71.25
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=125W
\u3000\u3000\u4f8b4\uff1a38dBm=30dBm+10dBm\uff0d2dBm
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=1W\u00d710\u00d70.625
\u3000\u3000\u3000\u3000\u3000\u3000\u3000=6.25W
\u3000\u3000\u8fd9\u6837\u90fd\u662f\u53e3\u7b97\uff0c\u662f\u4e0d\u662f\u5f88\u7b80\u5355\u554a\uff1f\u4f60\u8bb0\u4f4f\u4e86\u5417\uff1f
\u3000\u3000\u53e6\uff1adBw\u4e0eW\u7684\u6362\u7b97
\u3000\u3000dBw\u4e0edBm\u4e00\u6837\uff0cdBw\u662f\u4e00\u4e2a\u8868\u793a\u529f\u7387\u7edd\u5bf9\u503c\u7684\u5355\u4f4d\uff08\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4ee51W\u529f\u7387\u4e3a\u57fa\u51c6\u7684\u4e00\u4e2a\u6bd4\u503c\uff09\uff0c\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a10log\uff08\u529f\u7387\u503c/1w\uff09\u3002
\u3000\u3000dBw\u4e0edBm\u4e4b\u95f4\u7684\u6362\u7b97\u5173\u7cfb\u4e3a\uff1a0 dBw = 10log1 W = 10log1000 mw = 30 dBm\u3002
\u3000\u3000\u5982\u679c\u529f\u7387P\u4e3a1W\uff0c\u6298\u7b97\u4e3adBw\u540e\u4e3a0dBw\u3002
\u3000\u3000\u603b\u4e4b\uff0cdB\uff0cdBi, dBd, dBc\u662f\u4e24\u4e2a\u91cf\u4e4b\u95f4\u7684\u6bd4\u503c\uff0c\u8868\u793a\u4e24\u4e2a\u91cf\u95f4\u7684\u76f8\u5bf9\u5927\u5c0f\uff0c\u800cdBm\u3001dBw\u5219\u662f\u8868\u793a\u529f\u7387\u7edd\u5bf9\u5927\u5c0f\u7684\u503c\u3002\u5728dB\uff0cdBm\uff0cdBw\u8ba1\u7b97\u4e2d\uff0c\u8981\u6ce8\u610f\u57fa\u672c\u6982\u5ff5\uff0c\u7528\u4e00\u4e2adBm\uff08\u6216dBw\uff09\u51cf\u53e6\u5916\u4e00\u4e2adBm\uff08dBw\uff09\u65f6\uff0c\u5f97\u5230\u7684\u7ed3\u679c\u662fdB\uff0c\u5982\uff1a30dBm - 0dBm = 30dB\u3002
\u3000\u3000\u4e00\u822c\u6765\u8bb2\uff0c\u5728\u5de5\u7a0b\u4e2d\uff0cdBm\u548cdBm\uff08\u6216dBw\u548cdBw\uff09\u4e4b\u95f4\u53ea\u6709\u52a0\u51cf\uff0c\u6ca1\u6709\u4e58\u9664\u3002\u800c\u7528\u5f97\u6700\u591a\u7684\u662f\u51cf\u6cd5\uff1adBm \u51cf dBm \u5b9e\u9645\u4e0a\u662f\u4e24\u4e2a\u529f\u7387\u76f8\u9664\uff0c\u4fe1\u53f7\u529f\u7387\u548c\u566a\u58f0\u529f\u7387\u76f8\u9664\u5c31\u662f\u4fe1\u566a\u6bd4\uff08SNR\uff09\u3002dBm \u52a0 dBm \u5b9e\u9645\u4e0a\u662f\u4e24\u4e2a\u529f\u7387\u76f8\u4e58\u3002
\u8981\u6c42\u91c7\u7eb3
dBm\u662f\u4e00\u4e2a\u8003\u5f81\u529f\u7387\u7edd\u5bf9\u503c\u7684\u503c\uff0c\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a10lgP\uff08\u529f\u7387\u503c/1mw\uff09\u3002 [\u4f8b1] \u5982\u679c\u53d1\u5c04\u529f\u7387P\u4e3a1mw\uff0c\u6298\u7b97\u4e3adBm\u540e\u4e3a0dBm\u3002 [\u4f8b2] \u5bf9\u4e8e2W\u7684\u529f\u7387\uff0c\u6309dBm\u5355\u4f4d\u8fdb\u884c\u6298\u7b97\u540e\u7684\u503c\u5e94\u4e3a\uff1a 10lg\uff082W/1mw)=10lg\uff082000\uff09=10lg2+10lg1000=33dBm\u3002
108.75dBuV-107=1.75dBm; 1、对于接收信号强度（1）当测量电压为接收机输入阻抗上电压，换算该输入阻抗上功率应采用107算法，即接收机输入阻抗上的功率P绛旓細绉颁负鈥滃垎璐濈毊鐡︹濓紝杩欎釜鍗曚綅鍦‥MC閲岄獨鎵板姛鐜嘋lamp鐨勬祴璇曞氨鏈夌敤鍒帮紝灏辨槸浠1pW鍔熺巼鐢靛钩涓哄弬鑰冨熀鍑嗙殑缁濆鍔熺巼鍊硷紝1pW=0dBpW锛岃浆鎹负鍒嗚礉琛ㄧず鏂规硶鐨勭殑璁＄畻寮忎负10log(P/1pW)锛屽叾涓姛鐜嘝鍦ㄨ浆鎹㈡椂瑕佸寲涓簆W鐨勫崟浣嶃俻涓巑宸9浣嶆暟锛0dBmW=90dBpW=107dBuv锛宒BpW涓巇Buv宸17dB銆-绗竴娆″洖绛旈棶棰橈紝瀹屽叏鎵嬫墦...
绛旓細缁间笂113銆107涓ょ鎹㈢畻娉曠殑鎺ㄥ鍒嗘瀽,鎴戜滑鍦ㄨ繘琛dBm涓dBuv涔嬮棿杞崲鏃: 1銆佸浜庢帴鏀朵俊鍙峰己搴 (1)褰撴祴閲忕數鍘嬩负鎺ユ敹鏈鸿緭鍏ラ樆鎶椾笂鐢靛帇,鎹㈢畻璇ヨ緭鍏ラ樆鎶椾笂鍔熺巼搴旈噰鐢107绠楁硶,鍗虫帴鏀舵満杈撳叆闃绘姉涓婄殑鍔熺巼P=-107dBm + V(dBuv), 寮忎腑V(dBuv)涓烘帴鏀舵満杈撳叆闃绘姉涓婄殑鐢靛帇VL 銆 (2)褰撴祴閲忕數鍘嬩负鏀剁數纾佹劅搴旂數鍘媀i ,鎹㈢畻鎺ユ敹...
绛旓細2锛 鍦ㄦ寚瀹氬弬鑰冪數骞虫椂鍙敤鍒嗗埆琛ㄧず鐢靛帇鎴栬呯數鍦哄己鐨勭粷瀵瑰硷紝姝ゅ弬鑰冪數骞抽氱О涓0dB銆傚瀹氫箟锛1uV锛0dBuV銆1mW锛0dBm銆1mV锛0dBmV銆傝繖鏍凤紝濡傛灉涓涓俊鍙稟锛屽叾鐢靛钩涓3dBuV锛屽垯鎹㈢畻鎴愮數鍘嬬殑琛ㄧず鏂瑰紡涓猴細3锛20lgA/1uV锛岃绠楀緱鍒帮紝A锛1.4uV锛屼篃灏辨槸3dBuV鐨勪俊鍙风數鍘嬫槸1.4uV銆3锛 鐢ㄥ垎璐濊〃绀...
绛旓細鏈 棰戠巼楂樼殑绌块忚兘鍔涘ソ锛岀洿绾夸紶鎾紝澶氱敤浜庤璺濋氳 娉㈤暱澶х殑缁曞皠鏈寮猴紝澶氱敤浜庨暱绋嬮氳 鍔熺巼 鐏垫晱搴 锛dBm dBmV dBuV锛塪Bm=10log(Pout/1mW)锛屽叾涓璓out鏄互mW涓哄崟浣嶇殑鍔熺巼鍊 dBmV=20log(Vout /1mV)锛屽叾涓璙out鏄互mV涓哄崟浣嶇殑鐢靛帇鍊 dBuV=20log(Vout /1uV)锛屽叾涓璙out鏄互uV涓哄崟浣嶇殑鐢靛帇鍊...
绛旓細涓浗鐜拌鐨凱AL-D鍒剁數瑙嗕俊鍙锋爣鍑嗗皠棰戝甫瀹戒负5.75MHZ锛屽嵆B=5.75*106锛岄偅涔堝湪甯告俯涓嬶紙22銆侰锛屽嵆T=295K锛夐偅涔堝叾鍣０鍔熺巼鏄疦P=1.38*10-23*295*5.75*106=2.24*10-14w锛岀敤DBm琛ㄧずNPdbm=10lg{锛2.34*10-14锛*103}=-106.31dbm锛岀敤dbuv琛ㄧずNpup=108.75-106.31=2.44dbup銆傚彟澶栵紝鎻忚堪鍣０鐨...
绛旓細鍥藉瑙勫畾锛屽鍐呭ぉ绾跨殑杈撳嚭鍔熺巼搴斿皬浜15dbm锛屾垜瑙夌殑澶╃嚎鍙ｇ殑鍔熺巼搴旇鏄粡澶╃嚎澧炵泭鍚庤緭鍑虹殑鍔熺巼鍚э紝杩樿楂樻墜瑙ｆ儜銆傛瘮濡傚ぉ绾垮鐩2.5dbi锛岄偅鍏蜂綋澧炵泭鍑犲嶏紝鏈変粈涔堝叿浣撶殑鎹㈢畻鏂规硶 棰戠巼楂樼┛閫忚兘鍔涚洿绾夸紶鎾敤浜庤璺濋氳 娉㈢粫灏勬湰棰嗗己鐢ㄤ簬绋嬮氳 鍔熺巼 鐏垫晱搴 (dBm dBmV dBuV)dBm=10log(Pout/1mW)鍏禤outmW鍗曚綅...
绛旓細鏈夌偣锛屽洜涓洪鐜囬珮鐨勫鏄撹骞叉壈锛岃鎶樺皠锛屾墍浠ヨ繎鍦伴潰浼犳挱閮界敤棰戠巼姣旇緝浣庣殑娉紝杩欐牱鏈夋晥璺濈杈冨ぇ銆備絾鏄珮棰戠數纾佹尝鍙互琚ぇ姘斿眰鍙嶅皠锛屾墍浠ラ珮棰戞棤绾跨數鍙互闈犺繖涓鐐瑰湪楂樼┖浼犳挱锛岃繖鏍蜂紶鎾殑鑼冨洿鍙嶅掓瘮浣庨鐨勬洿澶т簡銆
绛旓細淇″彿寮哄害鏈鍙宠竟78dBuV鐪嬩笉鎳備粈涔堟剰鎬濓紵鍗婅韩涓嶉亗涓嶄笂鐝憿鐑鍜屽疄璇濆疄璇翠俊鍙峰己搴︽渶鍙宠竟78dBuV鐪嬩笉鎳備粈涔堟剰鎬濓紵
绛旓細浣犳槸璇存棤绾夸俊鍙峰己搴﹀惂锛-30dbm璇存槑浣犱俊鍙峰緢濂斤紝涓鑸窛绂绘棤绾胯矾鐢卞櫒5绫充互鍐咃紝骞朵笖鏃犻伄鎸＄墿鎵嶈兘杈惧埌杩欎釜淇″彿寮哄害銆傞殧涓閬撳灏辫-40dbm浠ヤ笂浜嗐備竴鑸-68浠ヤ笂绠楄壇濂斤紝涓嶄細褰卞搷缃戦燂紙鍛ㄥ洿骞叉壈澶ф垨鏈夊悓棰戦亾鐨勬棤绾夸俊鍙峰垯瑕-45dbm浠ヤ笂鎵嶄笉褰卞搷缃戦燂級淇″彿寮哄害鏈浣-120dbm鏈楂0dbm 妤间笂鍑犱綅璇互涓烘ゼ涓昏鐨勬槸鏈澶...
绛旓細妤间富锛屽鏋滄偍鐨勯璋变华鐨勫崟浣嶄娇鐢ㄧ殑dBm锛屽湪-70鍒-10dBm涔嬮棿灏卞彲浠ャ傚鏋滃崟浣嶆槸dBuV锛屽湪37鍒97dBuV涔嬮棿灏卞彲浠ャ
