英国电信 2021 通信面试题

Name 3 Vehicle Buses.

第2题：

Name 2 possible sources of Electromagnetic interference on Electronics Circuit ASM.

第3题：

Wavelength for 12MHz frequency signal is____

第4题：

Name 2 important considerations for car radio performance related to audio signal processing under multipath condition?

第5题：

What is the typical FM receiver RF signal strength to achieve 30dB S/N for car radio?

第6题：

When a radio is tuned to 98.1 MHz & with a LO of 108.8 MHz, what is the image frequency?

第7题：

For a system with a matched impedance, what is the Reflection Coefficient and SWR?

第8题：

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

第9题：

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

第10题：

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 packages.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 requirement without a heat sink and why.