Oscillator Design and Analysis for Temperature Compensation

• Main Authors: Chang-Feng Lin, 林正峰
• Other Authors: Yang, Web-Bin
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/24a85k

碩士 === 淡江大學 === 電機工程學系碩士在職專班 === 97 === This paper presents a simple oscillator with temperature compensation which is different from the other complex circuit. The oscillator is composed of ring oscillator and current reference which works with power supply and temperature compensation. In current reference circuit, the traditional current reference circuit is utilized to exhibit positive supply voltage and positive temperature coefficient. And the advance current reference circuit is utilized to exhibit negative supply voltage and temperature coefficient. By combining these two components with adding operation, the output current will eliminate the variation of supply voltage and temperature. The current reference simulate with 0.35μm standard CMOS process. Simulated results shows that the variation is roughly ±2% with a supply voltage range from 2.5 V to 3.8 V and the temperature variation is roughly ±99.2ppm/ ℃ over a temperature range from -40 ℃ to 85℃. In ring oscillator, a five-stage inverter is utilized. The time delay produced by the circuit which is given by the total parasitical capacitance seen at the output of each stage. The output frequency of this study is 4MHz, which can be used in IC with frequency divider. Due to a limited power consumption, the output frequency can not be increased.