Classification of ring oscillators
In this chapter we consider a classification of ring oscillators for the purpose of evaluating different oscillators in the literature, and guiding designers in choosing an architecture that will meet the needs of a particular system for both functionality and jitter performance.
Type of signal in the ring
Method of tuning
Format of signal(s) at output of the ring
In each case, examples will be used to illustrate the various classifications. Qualitative observations will also be made regarding the advantages and dis- advantages of each approach with regard to performance aspects such as jitter, immunity to power supply noise, tuning range, etc. Quantitative analysis will be covered in detail in Chapter 7.
Note that this system is not intended to be exhaustive or exclusive. It is not exhaustive in the sense that not all ring oscillators can be classiffed by this system; however, the majority of work in the literature can be covered by this scheme. It is not intended to be exclusive in that other schemes for organizing types of oscillators may be useful; however, the authors believe this scheme is useful for illustrating in a straightforward way the differences between design approaches.
KeywordsRing Oscillator Regenerative Switching Tuning Method Delay Modulation Delay Stage
Unable to display preview. Download preview PDF.