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\begin{eqnarray}
Z_{IN}=\frac{å
¥åé»å§ã®å€å}{å
¥åé»æµã®å€å}=\frac{{\Delta}V_{BE}}{{\Delta}I_{B}}
\end{eqnarray}
ãšãªããããå
¥åã€ã³ããŒãã³ã¹ZINã¯éåžžã«äœããªããŸãã
ãšããã¿æ¥å°åè·¯ã®åºåã€ã³ããŒãã³ã¹ZOUTã¯ã³ã¬ã¯ã¿è² è·æµæRCãšåãã«ãªããŸããåºåã€ã³ããŒãã³ã¹ZOUTãã³ã¬ã¯ã¿è² è·æµæRCãšåãã«ãªãçç±ã«ã€ããŠã¯å°ãé·ããªããŸãã®ã§ããã®èšäºã®åŸåã§èª¬æããŠããŸãã
ã³ã¬ã¯ã¿é»æµiCã¯ããŒã¹é»æµiBã«å¯ŸããŠãé»æµå¢å¹
çhfeãæããå€ãšãªããŸããé»æµå¢å¹
çhfeã®å€§ããªãã©ã³ãžã¹ã¿ã§ã¯1000çšåºŠã§ãããæ§é äžãé»æµå¢å¹
çhfeã倧ããããããšãã§ããªããã¯ãŒãã©ã³ãžã¹ã¿ã§ã¯æ°10çšåºŠãšãªã£ãŠããŸãããšããã¿æ¥å°åè·¯ã§ã¯å
¥åé»æµiINã¯ããŒã¹é»æµiBã§ãããåºåé»æµiOUTã¯ã³ã¬ã¯ã¿é»æµiCãšãªããŸãããã®ãããé»æµå©åŸAIã¯
\begin{eqnarray}
A_I=\frac{i_{OUT}}{i_{IN}}=\frac{i_{C}}{i_{B}}=h_{fe}
\end{eqnarray}
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ãã€ããŒã©ãã©ã³ãžã¹ã¿ã®å ¥åé»å§(ããŒã¹ãšããã¿éé»å§VBE)ãå¢å ãããšãããŒã¹é»æµIBãå¢å ããã³ã¬ã¯ã¿é»æµICãå¢å ãããããåºåé»å§(ã³ã¬ã¯ã¿ãšããã¿éé»å§VCE)ãæžå°ããŸãããã®ãããå ¥åé»å§ãšåºåé»å§ã®äœçžã¯180°å転ããŸãã
é»åå©åŸAPã¯é»å§å©åŸAVÃé»æµå©åŸAIãªã®ã§ããšããã¿æ¥å°åè·¯ã§ã¯å€§ããªé»åå¢å¹ ãå¯èœã§ããå ¥åã€ã³ããŒãã³ã¹ãäœãããå°ã䜿ãã«ããåè·¯ã§ããããã®é»åå©åŸã倧ããããä»ã®æ¥å°æ¹åŒ(ã³ã¬ã¯ã¿æ¥å°åè·¯ãšããŒã¹æ¥å°åè·¯)ãããå€ã䜿ãããŸãã
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- è² è·ç·ãåŒã
- ã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã®åäœç¹VCE0ãæ±ãã
- ããŒã¹é»æµiBã®åäœç¹IB0ãæ±ãã
- ããŒã¹ãšããã¿éé»å§VBEã®åäœç¹VBE0ãæ±ãã
1.è² è·ç·ãåŒã
ãã€ããŒã©ãã©ã³ãžã¹ã¿ã®ããŒã¹ã«å°å ãããã€ã¢ã¹é»å§VBE0ãæ±ããããã«ããã€ããŒã©ãã©ã³ãžã¹ã¿ã®ãIC-VCEç¹æ§ãã«è² è·ç·ãåŒãå¿ èŠããããŸãããŸããè² è·ç·ã®åŒãæ¹ã«ã€ããŠèª¬æããŸãã
ã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã0Vã®æã«ã³ã¬ã¯ã¿é»æµICãäœAã«ãªãããæ±ããŸããã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã0Vã®æã¯ãã³ã¬ã¯ã¿è² è·æµæRCã«ã¯é»æºé»å§VCCãå°å ãããŸãããã®ãããã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã0Vã®æã«ãããã³ã¬ã¯ã¿é»æµICã¯
\begin{eqnarray}
I_C=\frac{V_{CC}}{R_C}
\end{eqnarray}
ãšãªããŸãã
次ã«ãã³ã¬ã¯ã¿é»æµICã0Aã®æã«ã³ã¬ã¯ã¿ãšããã¿éé»å§VCEãäœVã«ãªãã®ããæ±ããŸããã³ã¬ã¯ã¿é»æµICã0Aã®æã¯ãã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã¯é»æºé»å§VCCãšçãããªãããã
\begin{eqnarray}
V_{CE}=V_{CC}
\end{eqnarray}
ãšãªããŸãã
ãã®2ç¹ãçµãã çŽç·ãè² è·ç·ãšãªããŸããAç¹(\(0\),\(\displaystyle\frac{V_{CC}}{R_C}\))ãšBç¹(\(V_{CC}\),\(0\))ããè² è·ç·ã®åŸãã¯
\begin{eqnarray}
\frac{0-\displaystyle\frac{V_{CC}}{R_C}}{V_{CC}-0}=-\frac{1}{R_C}
\end{eqnarray}
ãšãªããŸããåçã¯\(\displaystyle\frac{V_{CC}}{R_C}\)ãªã®ã§ãè² è·ç·ã®åŒã¯ä»¥äžã®åŒãšãªããŸãã
\begin{eqnarray}
I_C=-\frac{1}{R_C}V_{CE}+\frac{V_{CC}}{R_C}
\end{eqnarray}
2.ã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã®åäœç¹VCE0ãæ±ãã
ã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã®æ¯å¹ ã倧ããåããããåäœç¹ãèšå®ããŸãããšããã¿æ¥å°åè·¯ã§ã¯ãã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã®åäœç¹ã¯é»æºé»å§VCCãš0Vã®çãäžä»è¿VCE0ã«èšå®ããŸãã
3.ããŒã¹é»æµiBã®åäœç¹IB0ãæ±ãã
ãã€ããŒã©ãã©ã³ãžã¹ã¿ã®ãIC-VCEç¹æ§ããšè² è·ç·ã«ãããŠãã³ã¬ã¯ã¿ãšããã¿éé»å§VCEãåäœç¹VCE0ã®æã«ãããããŒã¹é»æµIBãåäœç¹IB0ãšãªããŸãããã®åäœç¹IBOã¯ãã€ã¢ã¹é»æµãšåŒã°ããŠããŸãã
4.ããŒã¹ãšããã¿éé»å§VBEã®åäœç¹VBE0ãæ±ãã
ãã€ããŒã©ãã©ã³ãžã¹ã¿ã®ãIB-VBEç¹æ§ãã«ãããŠãããŒã¹é»æµIBãåäœç¹IB0ã®æã«ãããããŒã¹ãšããã¿éé»å§VBEãåäœç¹VBE0ãªããŸãã
ããã§ãã2.ã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã®åäœç¹VCE0ãæ±ãããã«ãããŠã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã®åäœç¹VCE0ã倧ããããããããå°ããããããŠããŸããšãã³ã¬ã¯ã¿ãšããã¿éé»å§VCEã®æ³¢åœ¢ãæªãã§ããŸããŸãããã®ãããåäœç¹ã®èšå®ã«ã¯æ³šæãå¿
èŠãšãªããŸããäŸãã°ãåäœç¹ã倧ãããããããš(å³ã«å¯ãããããš)ãåºåé»å§(ã³ã¬ã¯ã¿ãšããã¿éé»å§VCE)ãé»æºé»å§VCCãè¶
ããŠããŸããŸããåºåé»å§(ã³ã¬ã¯ã¿ãšããã¿éé»å§VCE)ã¯é»æºé»å§VCCãè¶
ããããšãã§ããªãã®ã§ã波圢ã®äžåŽãåããŠããŸãã波圢ã«æªãçããŸãã
è£è¶³
ãšããã¿æ¥å°åè·¯ã®ãã©ãŒå¹æãšã¯ïŒ
ãšããã¿æ¥å°åè·¯ã§ã¯ãé»å§å©åŸãAVãšãããšãããŒã¹ã³ã¬ã¯ã¿éã®å®¹éCBCã(1+AV)åãªã£ãŠã¿ããŸãã
å°ãç解ãã«ããå 容ãªã®ã§ããŸããã©ãŒå¹æã®ã€ã¡ãŒãžã説æããŸãã容éCã®ã³ã³ãã³ãµã«é»è·Qãå é»ããç°¡åãªåè·¯ã3ã€äžå³ã«ç€ºããŸãã
1çªå·Šã®åè·¯
çæ¹ã®é»æ¥µã«Vã®é»å§ãå°å ããããçæ¹ã®é»æ¥µãæ¥å°ããŠããåè·¯ã§ãããã®åè·¯ã«èç©ãããé»è·Qã¯
\begin{eqnarray}
Q=CV
\end{eqnarray}
ãšãªããŸãã
çãäžã®åè·¯
çæ¹ã®é»æ¥µã«Vã®é»å§ãå°å ããããçæ¹ã®é»æ¥µã«ïŒVã®é»å§ãå°å ããŠããåè·¯ã§ãããã®åè·¯ã«èç©ãããé»è·Qã¯
\begin{eqnarray}
Q=CÃ(V-(-V))=2CV
\end{eqnarray}
ãšãªããŸãã
èŠæ¹ãå€ãããšãVã®é»å§ã§2Cã®å®¹éãå é»ããŠãããšãèŠããŸããã€ãŸããAç¹ããèŠãã°ãã³ã³ãã³ãµã®å®¹éã2åã«ãªã£ãŠèŠãããšããããšã«ãªããŸãããŸããããã¯å®¹é2Cã®ã³ã³ãã³ãµã®çŽåæ¥ç¶ã«ãããŠãçæ¹ã®é»æ¥µã«Vãå°å ããããçæ¹ã®é»æ¥µã«ïŒVã®é»å§ãå°å ããŠãããšãèšããŸãã
å³ã®åè·¯
çæ¹ã®é»æ¥µã«Vã®é»å§ãå°å ããããçæ¹ã®é»æ¥µã«ïŒAVVã®é»å§ãå°å ããŠããåè·¯ã§ãããã®åè·¯ã«èç©ãããé»è·Qã¯
\begin{eqnarray}
Q=CÃ(V-(-A_VV))=C(1+A_V)V
\end{eqnarray}
ãšãªããŸãã
ãããèŠæ¹ãå€ãããšãVã®é»å§ã§C(1+AV)ã®å®¹éãå é»ããŠãããšãèŠããŸããã€ãŸããAç¹ããèŠãã°ã容éã(1+AV)åã«ãªã£ãŠèŠãããšããããšã«ãªããŸãã
ãšããã¿æ¥å°åè·¯ã§ã¯å
¥åé»å§(ããŒã¹ãšããã¿éé»å§VBE)ã«-AVãæããå€ãåºåé»å§(ã³ã¬ã¯ã¿ãšããã¿éé»å§VCE=-AVVBE)ãšãªããŸãããã®ãããããŒã¹ã³ã¬ã¯ã¿éã®å®¹éCBCã«èç©ãããé»è·Qã¯
åŒã§è¡šããšã
\begin{eqnarray}
Q=C_{BC}Ã(V_{BE}-V_{CE})= C_{BC}Ã(V_{BE}-(-A_VV_{BE}))=C_{BC}(1+A_V)V_{BE}
\end{eqnarray}
ãšãªããããŒã¹åŽããèŠãã°ãããŒã¹ã³ã¬ã¯ã¿éã®å®¹éCBCã(1+AV)åãªã£ãŠèŠããã®ã§ãã
ãã®ãã©ãŒå¹æã«ãã容éCBC(1+AV)ãšããŒã¹æµæRBãã«ãããªãåšæ³¢æ°
\begin{eqnarray}
f_CïŒ\frac{1}{2{\pi}R_BC_B(1+A_V)}
\end{eqnarray}
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