课程名称︰电子学二
课程性质︰必修
课程教师︰吕良鸿
开课学院：电机资讯学院
开课系所︰电机工程学系
考试日期（年月日）︰104/5/26
考试时限（分钟）：50分钟
试题 :
电子学二第二次小考 Ch8
1. A common-source MOS amplifier, whose equivalent circuit resembles that in
Fig. 1, is to be evaluated for its high-frequency response. For this
particular design, R_sig = 1 MΩ, R_G = 5 MΩ, R_L' = 100 kΩ, C_gs = 0.2
pF, C_gd = 0.1pF, and g_m = 0.3 mA/V. Estimate the midband gain and the
3-dB frequency. (Please use the open-circuit time constants to calculate
this problem) [50%]
http://imgur.com/mS766s5
2. Consider the active-loaded CMOS amplifier of Fig. 2 for the case of all
transistors operated at the same |V_OV| and having the same |V_A|. Also let
the total capacitance at the output node (C_L) be four times the total
capacitance at the input node of the current mirror C_m, and show that the
unity-gain frequency of A_d is g_m/2πC_L. For V_A = 20 V, V_OV = 0.2 V,
I = 0.2 mA, C_L = 100 fF, and C_m 25 fF, find the dc value of A_d, and the
value of f_P1, f_t, f_P2, and f_Z. [50%]
http://imgur.com/nYH6pOd