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Nonlinear design of low phase noise oscillator based on load line analysis
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- Authors
- Moon-Que Lee, Keun-Kwan Ryu, In-Bok Yom, Sung-Pal Lee
- Issue Date
- 2001-08
- Citation
- Radio and Wireless Conference (RAWCON) 2001, pp.121-124
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- A novel approach to the design of a low phase noise oscillator is presented, which enables one to optimize the phase noise and the oscillation power simultaneously. Through a load line analysis of a transistor without feedback, the oscillation power and the base-band (1/f) noise up-conversion factor are investigated and predicted. In the implementation of an embedding feedback network, a generalized formulae considering the quality factors of the embedding feedback elements are newly introduced. The proposed approach is applied to the design of an engineering model voltage controlled oscillator for a satellite transponder. The phase noise characteristics of the manufactured VCO exhibit -114dBc/Hz @10 kHz offset and -133 dBc/Hz @100 kHz offset at 1748 MHz.