1. The high gain phase comparator for reduction of close-to-carrier phase noise;underhill;12th European Frequency and Time Forum EFTF Warsaw,1998
2. The Anti Jitter Circuit for low spurious DDS square waves and low cost fractional-n synthesis;underhill;12th European Frequency and Time Forum EFTF Warsaw,1998
3. Phase Noise and Time Jitter Reduction Circuit;underhill;Microwaves and RF Conf,1996
4. reduction of phase noise in single transistor oscillators;underhill;Proceedings of 10th International Conference on European Frequency and Time,1996
5. spectral improvement of direct digital frequency synthesisers and other frequency sources;underhill;Proceedings of 10th International Conference on European Frequency and Time,1996