摘要
调频范围是压控振荡器的一个重要的性能指标,当调频范围增大时,振荡器的振幅会随着频率的不同而改变。为了保证压控振荡器在调频范围内振幅恒定,提出了一种新型的自动振幅控制的电路结构。自动振幅控制电路由峰值检测、比较器和低通滤波器几部分构成,自动振幅控制电路与压控振荡器组成的反馈环路控制压控振荡器的输出恒定。电路采用标准的0.35μm CM O S工艺流片并进行测试。测试结果表明:压控振荡器的调频范围为18.2MH z^24.3MH z,达到了28.7%,自动振幅控制电路保证压控振荡器的振幅变化仅为8.7%。
The tuning range is an important performance parameter of voltage-controlled oscillators （VCO）, but as the tuning range increases, the oscillator amplitude will vary at different frequencies. This paper present a circuit for automatic amplitude control that ensures that the oscillators amplitude remains constant. The automatic amplitude control uses a peak detector, a comparator and a low pass filter. The automatic amplitude control is conrected to the VCO by a feedback loop to keep the VCO output constant. The circuits were fabricated using a standard 0.35 /~m complementary metal oxide semiconductor （CMOS） process. The measured VCO tuning range was from 18.2 MHz to 24.3 MHz, for a range of 28.7 % while the automatic amplitude control circuit ensures that the VCO amplitude only varies by 8.7 %.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第7期1337-1340,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(60475018)
关键词
互补-MOS型集成电路
压控振荡器
自动振幅控制
峰值检测
调频范围
complementary metal oxide semiconductor
voltage-controlled oscilla
or, automatic amplitude control
peak detector
tuning range
