杭州矽力杰笔试

IC Design Engineer Test Sheet Analog Design Device Knowledge 1. p+/n- junction and p-/n+ junction, which has a higher breakdown voltage? Why? For a p+/n- junction having NA and ND, what is the approximate function of junction capacitance (Cj) vs. reverse biased voltage (VR)? 2. Draw the cross-section of a CMOS inverter. Draw the parasitic structure on the cross-section. Describe ways to prevent “latch-up”? Circuit Analysis 3. See the figure below. a. Draw the bode plot for this circuit. b. Estimate the systematic offset in this amplifier. c. Which is the positive input?
4. See the figure below. a. What is this circuit? b. Which input is the positive input? c. How much current flows in P2? d. If I=10uA, what is a good selection for the value of R? e. What is the Common Mode Input Range for this circuit? f. What is the Common Mode Output Range for this circuit? g. Assume the only capacitance is from OUT to GND. Draw a Bode Plot. h. Assume no load. What is the maximum positive slew rate if COUT=C? What is the maximum negative slew rate?
5. See the figure below. Assume at time=0 inductor current is 0A. Draw inductor current, VX and VOUT vs. time.

6. See the figure below. a. What is this circuit? b. What is the desired ratio R2/R1? c. How many stable points does this circuit have? d. Assume R1 and R2 have no Temperature Coefficient. Draw a graph of I in R2 vs. Temperature. e. What is the minimum supply voltage necessary for this circuit to work properly?  EMBED Visio.Drawing.11 
 7. See the figure below. a. Write the gain equation of each circuit. b. Assuming VO=0 at time 0. Sketch VO(t) for the given input signal.  EMBED Visio.Drawing.11 
 8. Draw Buck Converter Circuit and key waveform, explain the basic operations at steady state.  Other Must Answer (Question 1-3) Question 1: Write the V/I relationship equations for resistor (R), capacitor (C), and inductor (L). Question 2: Given VB in Table 1, please calculate VC and VE. Assumptions: beta of NPN is infinity, P-N junction forward voltage drop is 0.7V.  EMBED Visio.Drawing.11 
 VB VE VC 0V 10.7V 20.7V Question 3: 假设图中理想放大器工作在深度负反馈状态，请计算下图输出端电压（VOUT）。  EMBED Visio.Drawing.11 
 For Test Engineer (Question 4-5) Question 4： 用C语言写一个递归算法求N! Question 5： C语言题目 a. 在VC6.0 编译环境下，下列类型变量需要占几个字节内存： int float double long char unsigned char b. 以下程序的输出结果： #define ADD(x) (x)+(x) main() { int a=4,