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The Design of CMOS Radio-Frequency Integrated Circuits, Second Edition by Thomas H. Lee

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CHAPTER SEVENTEENOSCILLATORS AND SYNTHESIZERS

17.1 INTRODUCTION

Given the effort expended in avoiding instability in most feedback systems, it would seem trivial to construct oscillators. However, simply generating some periodic output is not sufficient for modern high-performance RF receivers and transmitters. Issues of spectral purity and amplitude stability must be addressed.

In this chapter, we consider several aspects of oscillator design. First, we show why purely linear oscillators are a practical impossibility. We then present a linearization technique that uses describing functions to develop insight into how nonlinearities affect oscillator performance, with a particular emphasis on predicting the amplitude of oscillation.

A survey ...

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