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ELE7060

                       RF Circuits and Systems

 

Teacher

CHENG Kwok-keung, Michael
B.Sc., Ph.D. (London), MIEEE, AMIEE
Assistant Professor, Department of Electronic Engineering

 

Course Highlight
 

Transceiver architecture

A transceiver is a building block that interfaces between the user and the transmission medium, i.e. the free air in the mobile communication systems. In this course, you will learn the principles of heterodyne and direct-conversion transceiver design. A detailed treatment of their design issues and trade-off will be presented.
Frequency Synthesizers
The majority of the new frequency synthesizers utilize the phase-locked loop (PLL). Indeed, it was the realization of the PLL in an integrated circuit that led to the inexpensive frequency synthesizer. The basic building blocks of PLL comprises voltage-controlled oscillator, phase detector, frequency divider and loop filter. In practice, in the design of PLL, the specifications of every component must be chosen with extreme care.
High efficiency power amplifier design
Today's wireless systems impose challenging requirements on the power amplifier (PA) designer. A mobile phone handset PA has to be as efficient as possible to conserve battery power. Base stations also have efficiency specifications due to power and cooling limitations. This part of the course addresses the design issue of different classes of amplifier operation such as A, B, AB, C, D, E and F. The class of operation has very important implications for power amplifiers in terms of linearity and efficiency.
Linearization techniques for RF transmitters
In modern wireless communication systems, complex modulation method such as QPSK are being used to increase bandwidth efficiency. These form of modulations require transmitters using highly linear amplifiers. In practice, however, there is a trade-off between efficiency and distortion. Recently, a number of linearization schemes have been developed that reduce the amount of distortion added by an transmitter. In this part, concepts of feedforward, predistortion, and feedback techniques will be discussed.
Satellite broadcasting systems
Satellite broadcasting has evolved rapidly since the 1980s. A satellite link transmits radio waves that carry some form of communications, video, data or audio, from one or more uplinks via a satellite to an unlimited number of receive stations. The underlying theory and operation of all components required to assemble a viable satellite reception system will be explored here.
Advanced technologies for wireless communications
Another key decision in the design of a transceiver is the choice of the technology. GaAs circuits achieve the best results in critical blocks such as the low-noise amplifier and the power amplifier. In this section, various technologies such as Bi CMOS, digital CMOS and SiGe will be addressed.


Laboratory/Practical
 

The laboratory work includes experiments and CAD practice. The properties and characteristics of the components will be individually investigated and then components will be integrated to form complete working microwave systems. The training gives a good insight to the structure of high frequency circuits and provides an excellent grounding in basic microwave measurements.


 

 

 
 

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