Abstract
In this thesis, design of two microwave transmitter sub-block circuits, including the power amplifier and the frequency divider, is presented. This thesis consists of six chapters: Chapter one, we will briefly introduce our research background and the contents of this thesis. In chapter two, we will talk about some design issues for microwave power amplifier, including the power gain, stability, and power added efficiency. We will also show the various types of linear power amplifiers. A two-stage power amplifier with diode linearizer is presented in chapter three. It is implemented in the 0.18μm CMOS process for 802.11a 5.2GHz applications. The power amplifier is consisted of two cascode stages and has good stability. The diode linearizer is used to offer the bias voltage for the output stage and has an advantage of increasing the linearity of the circuit. In the chapter four, design of a 60GHz power amplifier for IEEE 802.15.3c application is presented and design method of coplanar waveguide is also discussed. The design is implemented by WIN GaAs 0.15μm pHEMT process technology. The power amplifier is composed of three stages, including the gain stage, the driver stage, and the output power stage. At the output stage, the branch line couplers are adopted to achieve power dividing/combining functions to get the high output power. In the chapter five, we focus on the design of a popular high-frequency divider: injection-locked frequency divider (ILFD). we will first figure out the relationship between the parameters of ILFD, and then try to design a wide locking ILFD which can be operated in K-band. According to the design equations, we know that the locking range of the ILFD is inversely proportional to the Q factor of LC-tank. But low Q factor will cause low output power and therefore narrow the locking range when the ILFD is operated in high frequency. We have designed a ILFD which has both wide locking range and high output power in this chapter. A simple conclusion is made in chapter six and we shortly discuss the possible method to improve the circuits for future work.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
