一种低功耗低温漂振荡器的设计

Design of a Low Power Low Temperature Drift Oscillator

基于0.15μm BCD工艺,提出了一种低功耗低温漂振荡器。分析了环形振荡器的振荡频率温度漂移特性,采用翻转电平优化技术,结合短路电流控制技术,获得了低温度漂移的振荡频率。且电流消耗极低。该振荡器适用于锂电池保护监测芯片。测试结果表明,在-40℃~100℃温度范围、32 kHz振荡频率、5 V电源电压条件下,该振荡器的振荡频率随温度的变化率小于3.3%,电流消耗仅为170 nA。

A low power oscillator with a low frequency-temperature drift was designed in a 0.15μm BCD IC process.The ring oscillator’s temperature drift characteristics of oscillating frequency were analyzed.By adopting flip level optimization technique and short circuit current control technique,an oscillating frequency with a low temperature drift was obtained while a low current consumption was required.The proposed oscillator was integrated in a Li-ion/polymer battery protection and monitor IC.Test results showed that,under the conditions of-40℃~100℃temperature range,32 kHz output frequency and 5 V power supply,the variation range of oscillating frequency with the temperature was less than 3.3%,and the current consumption was only 170 nA.