4. (10%) Plot the input/output characteristic of the circuit shown in Fig. 4 using the ideal model.

5. (10%) A p-type semiconductor has the doping level \( N{A} = 1.5 \times 10^{16} / \mathrm{cm}^{3} \). Assume that \( n{i} = 2 \times 10^{10} / \mathrm{cm}^{3} \). Find the hole and electron concentrations (you must specify what value is hole concentration and what value is electron concentration).試題隨卷繳交接背面2國立臺北大學 109 學年度日間學士班暨進修學士班轉學生招生考試試題學制系級：通訊工程學系日間學士班 3 年級科目：電子電路第2頁共2頁☐可 ☑不可使用計算機