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美国Electrical Engineering专业优秀硕士毕业论文展示样板 Oscillator Phase Noise Reduction Using Nonlinear Design Techniques [2]

论文作者:英语论文网论文属性:硕士毕业论文 dissertation登出时间:2012-08-18编辑:Sam xu点击率:9572

论文字数:12000论文编号:org201208182313072170语种:英语 English地区:美国价格:$ 88

关键词:美国硕士毕业论文NonlinearOscillatorPhase noise

摘要:本文主要从Nonlinear Design Techniques分析,由代写美国留学生论文中心策划组提供。是英文语种、Electrical Engineering研究方向、不需要数据处理的硕士毕业论文,不需要盲审(博士或硕士生有这个需要),如有需求请联系本站论文购买中心或者提交相关文章的代写需求。

ftware was used to simulate several
comparison for the oscillators.  The example oscillator is shown to have decent phase noise but
exhibited extremely high harmonic content and transistor saturation, both usually considered to be
undesirable traits of an oscillator (Rohde, 1983). Both active and four-resistor bias oscillators
were designed, each producing
mW without saturation and with less harmonic content.  The
four-resistor bias configuration was introduced so that phase-noise measurements of two different
oscillator configurations could be compared.  Phase-noise measurements were simulated in the
To observe the effect of current pulse width on phase noise, five oscillators of each
configuration, all producing mW, were designed with differing pulse widths.   The power level of
5mW was selected to focus the study on the pulse width of the collector current and not dealing
with saturation and other undesired performance effects.  The results showed a definite
correlation between current pulse width and phase-noise level.

 
1.1
Literature Review
Until recently, oscillator phase noise reduction has been primarily based on ideas proposed by D.
B. Leeson in 1966 (Driscoll, 1973; Prigent et al. 1999). Leeson's  model of oscillator phase noise
was based on viewing an oscillator as a time-invariant system.  Properties of the oscillator such as
signal power, resonator Q, and noise figure, which do not vary with time, are used to obtain
optimal phase noise performance.  In this light, well-known oscillator noise models presented by
Randall Rhea (1990), W. P. Robins (1982), and Ulrich Rohde (1983) are all very similar.  This is
not to say that Leeson derived models are not useable; they just have seen their time in the
spotlight.  Circuit designers must take care when attempting phase noise optimization by these
methods.  For example, attempts at increasing Q have, also, unknowingly, increased noise figure,
thus completely counteracting the beneficial effects of improved Q (Hajimiri & Lee, 1998).
Two papers: "A General Theory of Phase Noise in Oscillators" (Hajimiri & Lee, 1998), and
"Oscillator Phase Noise: A Tutorial" (Lee & Hajimiri, 2000), offer a view of oscillator noise
different than that of previous works.  Hajimiri and Lee develop a phase noise model based on the
time-varying properties of oscillators. Specifically, the transient characteristics of the device
current flow.  Hajimiri & Lee developed a noise model that accounts for noise sources from this
current flow by studying the actual waveforms of the active device in an oscillator.  Unlike
Leeson's approach, Hajimiri & Lee made no assumptions concerning the effects of  device ???
noise and resonator bandwidth on the phase noise characteristics of an oscillator.
Evidence from references on oscillator phase noise demonstrate that noise sources located in
the transistor or other active device were the culprits responsible for phase noise.  Some excellent
sources on general device noise sources are found in the original solid-state electronics texts by
Manasse et al. (1967), Thornton et al. (1966) and Spangenburg 论文英语论文网提供整理,提供论文代写英语论文代写代写论文代写英语论文代写留学生论文代写英文论文留学生论文代写相关核心关键词搜索。

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