Low phase noise signal generation; Models and theory; Oscillators and their key elements; Fractional regenerative frequency division; Teaching

This paper reviews simplified models and theories which use simple transfer function techniques (at the operating frequency) to accurately predict the phase noise in both feedback and negative resistance oscillators. These theories are then used to produce some key topologies, design rules and circuits for oscillators. A discussion of a regenerative divider which produces ¾ and 2/3 of the imput frequency is then described. The paper finishes with a description of a one day short course on Low Phase Noise Oscillators, which includes a laboratory class with 5 experiments. This has been presented at the IEEE International Microwave Symposium in 2009, 2010 and 2011.