杭州矽力杰笔试.docx

杭州矽力杰笔试.docx

《杭州矽力杰笔试.docx》由会员分享，可在线阅读，更多相关《杭州矽力杰笔试.docx（9页珍藏版）》请在冰豆网上搜索。

杭州矽力杰笔试

AnalogDesign

DeviceKnowledge

1.p+/n-junctionandp-/n+junction,whichhasahigherbreakdownvoltage?

Why?

Forap+/n-junctionhavingNAandND,whatistheapproximatefunctionofjunctioncapacitance（Cj）vs.reversebiasedvoltage（VR）?

2.Drawthecross-sectionofaCMOSinverter.Drawtheparasiticstructureonthecross-section.Describewaystoprevent“latch-up”?

CircuitAnalysis

3.Seethefigurebelow.

a.Drawthebodeplotforthiscircuit.

b.Estimatethesystematicoffsetinthisamplifier.

c.Whichisthepositiveinput?

4.Seethefigurebelow.

a.Whatisthiscircuit?

b.Whichinputisthepositiveinput?

c.HowmuchcurrentflowsinP2?

d.IfI=10uA,whatisagoodselectionforthevalueofR?

e.WhatistheCommonModeInputRangeforthiscircuit?

f.WhatistheCommonModeOutputRangeforthiscircuit?

g.AssumetheonlycapacitanceisfromOUTtoGND.DrawaBodePlot.

h.Assumenoload.WhatisthemaximumpositiveslewrateifCOUT=C?

Whatisthemaximumnegativeslewrate?

5.Seethefigurebelow.

Assumeattime=0inductorcurrentis0A.Drawinductorcurrent,VXandVOUTvs.time.

6.Seethefigurebelow.

a.Whatisthiscircuit?

b.WhatisthedesiredratioR2/R1?

c.Howmanystablepointsdoesthiscircuithave?

d.AssumeR1andR2havenoTemperatureCoefficient.DrawagraphofIinR2vs.Temperature.

e.Whatistheminimumsupplyvoltagenecessaryforthiscircuittoworkproperly?

7.Seethefigurebelow.

a.Writethegainequationofeachcircuit.

b.AssumingVO=0attime0.SketchVO（t）forthegiveninputsignal.

8.DrawBuckConverterCircuitandkeywaveform,explainthebasicoperationsatsteadystate.

Other

MustAnswer（Question1-3）

Question1:

WritetheV/Irelationshipequationsforresistor（R）,capacitor（C）,andinductor（L）.

Question2:

GivenVBinTable1,pleasecalculateVCandVE.Assumptions:

betaofNPNisinfinity,P-Njunctionforwardvoltagedropis.

VB

VE

VC

0V

Question3:

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）。

ForTestEngineer（Question4-5）

Question4：

用C语言写一个递归算法求N!

Question5：

C语言题目

a.在编译环境下，下列类型变量需要占几个字节内存：

int

float

double

long

char

unsignedchar

b.以下程序的输出结果：

#defineADD（x）（x）+（x）

main（）

{

inta=4,b=6,c=7,d=ADD（a+b）*c;

printf（“d=%d\n”,d）;

}

c.设inta=7,b=9,t;执行完表达式t=（a>b）?

a:

b;后，t的值是？

d.设计一个排序函数，并同时获得最大值，最小值，均方根。

函数名、排序数列等自行定义。

ForAEEngineer（Question6-8）

Question6:

a.WhatisthiscircuitshownintheFigure?

b.PleasedrawthewaveformsforV2forthreecases（usethesamescale）:

C1=open,R3=1k;

R3=open,C1=1uF;

R3=1k,C1=1uF.

Question7:

DrawbodeplotsofVO/VI（gainandphase）forthecircuitshownbelow.Pleaselabeltheproperpole/zerolocation.

Case1:

R3=open

Case2:

R3=1K

Question8:

Figurebelowshowsasimplebuckconverter.Theswitchingfrequencyoftheconverteris1MHz.

a.VIN=10V,VOUT=4V,IOUT=5A,whatistheONtimeofQ2?

b.DrawwaveformsofVSWandIL1below（underthesametimescaleofVG-VSW）.

Assumption:

IOUT=5A.

ForLayoutEngineer（Question9-12）

Question9:

简述CMOS工艺流程。

Question10：

Drawthelayoutofatwo-inputNANDgate.

Question11：

下面电路图中有两个MOSFET（MAandMB）。

假设每个MOSFET有两个gatefigure，右下版图应该如何连接，才能使MA和MB匹配。

Question12：

画出不同的电流镜图，并简述各自特点。