A Dividerless Subharmonically Injection Locked Frequency Synthesizer with Self Injected Signal Aligning
Date Issued
2014
Date
2014
Author(s)
Wu, Pei-Chun
Abstract
Local oscillator plays an important role in wireless communication system. In radio frequency transceivers, phase locked loops are frequently used as a local oscillator. The development of analog phase-locked loop has a long history, and it has certainly become very well developed. However, there are still plenty of requirements that need to be improved upon, such as settling time, phase noise, reference spur, etc. Among these requirements, phase noise is still a challenging issue. Since then, many new techniques have been developed in order to improve the phase noise performance. Several new techniques have been created in recent years, two of which are worth noting here: dividerless phase locked loop and subharmonically injection locked phase locked loop. Both have seen great improvements in phase noise performance. However, there are still parts of the systems that are not well developed, such as switching between different modes, phase alignment of subharmonically injection locked PLL, etc. Nowadays people manual switch between modes and manually adjust for phase alignment. This paper proposes a new architecture which not only self-switches between different modes but also does the self-alignment for subharmonically injection locked PLL.
Subjects
Phase Locked Loop
Phase Noise
Dividerless Frequency Synthesizer
Subharmonically Injection Locked
Self-alignment
Type
thesis