EE笔试试题

EE笔试试题
1. Name 3 Vehicle Buses.
2. Name 2 possible sources of Electromagnetic interference on Electronics
Circuit ASM.
3. Wavelength for 12MHz frequency signal is____
4. Name 2 important considerations for car radio performan -ce related to audio signal processing under multipath condition?
5. What is the typical FM receiver RF signal strength to achieve 30dB S/N for car radio?
6. When a radio is tuned to 98.1 MHz & with a LO of 108.8 MHz, what is the image frequency?
7. For a system with a matched impedance, what is the Reflection Coefficie nt and SWR?
8. Which property of the output capacitor is the primary cause of Low Drop Out(LDO) regulator loop instability?
（1）Equivalent series resistance(ESR)
（2）Effective series inductance(ESL)
（3）Capacitance value
（4）Dielectric material

9. The switching regulator is capable of:
（1）Higher power conversion efficiency
（2）Providing an output voltage that is higher than the input
（3）Generating an output boltage oppsite in polarity to the input
（4）All of the above
10. A linear regulator op 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 pac kages.Each package has the following thermal characteristics:
Package Rja（摄氏度/W） Rjc（摄氏度/W）
SO14 125 30
D1P8 100 52
Choose the most suitable package to handle the power dissipation requireme nt without a heat sink and why.