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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
參考價 | 面議 |
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更新時間:2018-04-03 07:46:59瀏覽次數(shù):265
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圖中還畫出了負(fù)載電阻為200歐姆時的負(fù)載線??梢钥闯觯瑢?yīng)于Ib=0.1mA,負(fù)載電阻為80歐姆時,晶體管是處于線性放大區(qū),而負(fù)載電阻200歐姆時,已經(jīng)接近進入飽和區(qū)了。負(fù)載電阻由大到小變化,負(fù)載線以Vce=4.0為圓心呈扇狀向上展開。負(fù)載電阻越小,進入飽和狀態(tài)所需要的Ib值就越大,飽和狀態(tài)下的C-E壓降也越大。在負(fù)載電阻特別小的電路,例如高頻諧振放大器,集電極負(fù)載是電感線圈,直流電阻接近0,負(fù)載線幾乎成90度向上伸展(如圖中的紅色負(fù)載線)。這樣的電路中,晶體管直到燒毀了也進入不了飽和狀態(tài)。以上所說的“負(fù)載線",都是指直流靜態(tài)負(fù)載線;“飽和"都是指直流靜態(tài)飽和。
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