德尔福集团是全球最大的汽车系统和零部件生产制造商, 为客户提供品种齐全的汽车系统, 零部件和模块。今天成电的就业办老师介绍说德尔福是汽车界的`华为从来不在媒体上打广告。大家看看从美国空运过来的笔试题目。
1Name 3 Vehicle Buses.
2Name 2 possible sources of Electromagnetic interference on Electronics Circuit ASM.
3Wavelength for 12MHz frequency signal is____
4Name 2 important considerations for car radio performance related to audio signal processing under multipath condition?
5What is the typical FM receiver RF signal strength to achieve 30dB S/N for car radio?
6When a radio is tuned to 98.1 MHz & with a LO of 108.8 MHz, what is the image frequency?
7For a system with a matched impedance, what is the Reflection Coefficient and SWR?
8Which property of the output capacitor is the primary cause of Low Drop Out (LDO) regulator loop instability?
a) Equivalent series resistance(ESR)
b) Effective series inductance(ESL)
c) Capacitance value
d) Dielectric material
9The switching regulator is capable of:
a) Higher power conversion efficiency
b) Providing an output voltage that is higher than the input
c) Generating an output boltage oppsite in polarity to the input
d) All of the above
10A linear regulator op*(没抄清楚)
Vin(max)=10v,Vout(min)=4.8v,Iout(max)=2.5mA,Iq(max)=2.5mA,Ta(max)=8.5摄氏度The regulator is available in 3 package has the following thermal characteristics:
Package Rja(摄食度/W) Rjc(摄食度/W)
TO220 50 35
SO14 125 30
D1P8 100 52
Choose the most suitable package to handle the power dissipation requirement without a heat sink and why.