[問題] 兩個電子學的題目
1."Early effect" and "channel length modulation" are commonly observed
in modern transistor devices. which of following properties are " not" caused
by the effect?
(A)the base width of the BJT is reduced (B)The turn-on voltage of MOSFET is
reduced (C)The channel of the MOSFET is pinch-off (D) The emmiter current
of the BJT is incresed.
解答給D 但是我覺得是B
2.Temperture is extremely important to determine the operational
characteristics, which of the following is NOT true if the environmental
temperture is raised?
(A)It's harder to induce channel in the MODFET (B)The saturation current
of the BJT is reduced (C)The characteristics of MOSFETs are shifted more than
BJTs (D) The temperture compensation can be implemented by circuit designs.
解答給B 但我以為是A
想請問板上大大是解答錯了還是我想錯了 第二題的c雖然
我知道但是不太知道該用什麼方法解釋 感謝幫忙解答的人!
補問一個
我看書上說一個電路的Phase Margin如果太小 代入Transfer Function
可以畫出Frequency response 且輸出(time domain)會有抖動的現象
想請問 time domain會抖動這要怎麼看? 我只想到因為 PM越小 pole越接近右半面
響應越不穩，但是想不到一個能表達成方程式或是別的想法?
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※ 編輯: stevegood 來自: 114.33.234.33 (10/07 21:04)
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