摘要
介绍了一种用于无线接收机的具有稳定工作状态的超再生振荡器.这一超再生振荡器的起振时间被由超再生振荡器、高效率包络检波器和高精度电荷泵等构成的类似于锁相环的环路锁定在某一固定状态上.文中建立了环路的离散模型,分析了环路的稳定性,并介绍了主要的模块电路.该振荡器采用0.5μm CMOS工艺实现,工作在315MHz/433MHz的工业、科学和医药（ISM）频率段,电源电压为2.5~5.5V.测试结果显示,振荡器的起振时间与工艺、温度、工作频率和电源电压等无关.
A stable super-regenerative oscillator （SRO） for industrial scientific and medical wireless receivers has been implemented in standard 0.5μm CMOS technology. The startup time of the SRO is locked by a loop composed of a voltage-controlled SRO,an effi- cient envelope detector,and an accurate charge pump, which is similar to a phase-locked loop without input clock. This paper presents a discrete model with stability analysis and the key circuits of the loop. Under a 2.4-5. 5V supply,the measured results indicate that the startup time of the SRO is independent of changes in technology, temperature,operating frequency,and supply voltage.
关键词
超再生振荡器
起振时间
锁相环
无线接收机
super-regenerative oscillator
startup time of oscillator
phase-locked loop
wireless receiver
