文档介绍：1GHz Tuning Range, Low Phase Noise, LC Oscillator with Replica Biasing
Common-Mode Control and Quadrature Outputs
Mihai . Sanduleanu Jan Peter Frambach
Philips Research Eindhoven Philips Semiconductors Nijmegen
@ Jan-@
Abstract
The paper presents a low phase noise LC oscillator jitter transfer and low jitter generation. Another
with 1GHz tuning range suitable for fiber optic advantage of an LC oscillator consists in the frequency
transceivers and SDH/ (STM16/OC48 stability and the robustness towards temperature and
applications. In order to reduce power supply pushing process variations. The price usually paid is less tuning-
and to have a well mon-mode with range since integrated varicaps have limited capacitance
temperature and process, a replica biasing circuit variation with voltage. In such designs, a fundamental
regulates mon-mode voltage. The guaranteed trade-off is the tunability versus phase-noise. As phase-
tuning range covered with process and temperature noise is inversely proportional with the square of the
variations is -. A new concept of quality factor of the tank circuit and the derivative of the
quadrature generation has been introduced. Measured phase of the LC tank is directly proportional with Q it is
results show a phase noise of –128dBc @ 3MHz @ obvious that one cannot get very good phase-