中圖分類(lèi)號(hào)： TM752 文獻(xiàn)標(biāo)識(shí)碼： A DOI：10.16157/j.issn.0258-7998.222668 中文引用格式： 尚林林，周盼，趙鵬. 應(yīng)用于電源監(jiān)控芯片的高精度、低功耗RC振蕩器設(shè)計(jì)[J].電子技術(shù)應(yīng)用，2022，48(10)：43-47，53. 英文引用格式： Shang Linlin，Zhou Pan，Zhao Peng. Low power consumption, high precision RC oscillator for power monitoring chip[J]. Application of Electronic Technique，2022，48(10)：43-47，53.
Low power consumption, high precision RC oscillator for power monitoring chip
Abstract： High precision and low power RC oscillator is designed which is applied to power monitoring chip . The circuit is fabricated in a 0.35 μmBCD process . The RC oscillator includs reference module and RC circuit generation module. Based on the principle of RC oscillator and the intention of reducing the influence of temperature and power supply voltage changes on the oscillator frequency. In order to reduce oscillator period varies with the supply power, a new type of power supply voltage compensation is introduced to reduce the influence of the change of power supply voltage on the hysteresis time of the comparator. And to suppress the effect of temperature on oscillator frequency, the on-resistance and linear resistance of MOS tube are used for temperature compensation. To improve the accuracy of the on-resistance of the MOS tube,and overcome the problem of the traditional supplementing resistance inaccurate, a high precision and low power digital tuning circuit with 5 bit decoder is designed. The simulation results show that the input voltage range is 2.5 V ~ 5.5 V, the oscillation period error range is -0.8%~+0.14%， the temperature range is-40°C~125°C,and the oscillation period error range is -0.3%~+0.79%.The maximum quiescent current 5.1 μA, RC circuit generation module is 0.9 μA.This circuit is simple in structure, low in cost and easy to implement, applied to many power monitoring chips.
Key words : RC oscillator; temperature compensation; supply voltage compensation; digital tuning circuit
