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发表于 2008-8-8 11:30:10
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On the Exact Design of RF Oscillators by Qiuting Huang
Integrated Systems Laboratory, Swiss Federal Institute of Technology
CH-8092 Zurich, Switzerland
ABSTRACT
Important requirements for oscillators used in RF applications
typically include well controlled amplitude, low
phase noise relative to the carrier and low power consumption.
This paper presents a rigorous analysis 'of
phase noise for the Colpitts oscillator and derives an
exact formula for the phase noise to carrier ratio. The
latter is inversely proportional to the bias current and the
quality factor of the LC resonator. Improvement in the
active device has only a minor impact on the oscillator
performance at 1-2 GHz. |
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