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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
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廈門泰尼電氣有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
參考價(jià) | 面議 |
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更新時(shí)間:2015-03-25 15:05:07瀏覽次數(shù):160
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KEBA ES100S*-*KEBA ES100S
KEBA ES100S*-*KEBA ES100S
你可以回憶一下:LC電路的諧振頻率計(jì)算公式:
fr=
例8-9
計(jì)算在可變電容范圍為400到100pF的頻率范圍,假如線圈電感為1μH。假定C2的值相當(dāng)大,對(duì)電路不會(huì)產(chǎn)生影響,得到高頻為:
fh=
=15.9MHz
低頻為:
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fl= =7.96MHz
高頻減去低頻的值就得到了頻率的范圍。
frange=fh-fl=15.9MHz-7.96MHz=7.94MHz
可見,在可變電容的范圍是4到1時(shí),高頻與低頻的比率為2:1,這是因?yàn)轭l率反比于電容值的平方根。
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