一种低电压高精度振荡器的设计  

Design of a Wide Input Voltage and High Precision Oscillator

作　　者：李艳丽[1] 冯全源[1] 

机构地区：[1]西南交通大学微电子研究所,成都610031

出　　处：《微电子学》2015年第3期320-323,共4页Microelectronics

基　　金：国家自然科学基金资助项目(61271090);国家高技术研究发展计划(863计划)重大项目(2012AA012305)

摘　　要：提出了一种结构简单、电源电压宽、精度高的振荡器。利用系统的基准偏置电流对电容进行充放电,并且与该偏置电流作用在电阻上的电压进行比较,产生680kHz的方波信号。该电路在电源电压大于2.2V时,就可得到高精度的振荡频率。采用0.5μm OKI工艺,利用Hspice和Cadence对电路进行仿真。在芯片系统典型应用环境下仿真得到振荡频率为680kHz;电源电压在2.2-6V,温度为-40℃-85℃变化范围时,振荡频率的范围为663-707kHz,最大偏移量为＋3.97%;电压为5V时,该振荡器振荡频率的偏移在±1.18%以内。An oscillator with simple structure, wide power supply voltage and high precision was presented. A voltage using a bias current to charge and discharge a capacity was compared with a voltage produced by the bias current applied to the resistance, thus a 680 kHz signal was obtained. The proposed oscillator could get a high precision oscillator frequency when the power supply voltage was over 2.2 V. The circuit was based on 0.5 μm OKI technology library, and was simulated by the Cadence and Hspiee software. Under the environment of typical applications of the chip system, an oscillation frequency of 680 kHz was obtained. The range of oscillation frequency was 663 kHz-707 kHz, and the maximum offset was ＋3.97% with the power supply voltage changing from 2.2 V to 6 V and the temperature changing from -40℃ to 85 ℃. The oscillation frequency offset was within ±1.18% at the power supply voltage of 5 V.

关 键 词：充放电电容 宽电源电压 高精度 基准电流 

分 类 号：TN432[电子电信—微电子学与固体电子学]