摘要
为了降低DC/DC电源芯片过流期间的功耗,本文设计了一种可频率迁移的高精度振荡器,芯片出现过流情况时,振荡器频率可降至100 kHz以下.基于CSMC 0.25μm 30 V-60 V BCD工艺完成了电路设计、仿真.该振荡器常温下可以得到信号幅值为0.6 V~3.2 V、频率为260 kHz的锯齿波.温度偏差在±4.23%以内,电源灵敏偏差在±1.6%以内.出现工艺角偏差时,采用熔丝修调对振荡器的频率加以修正.
In order to reduce the power consumption during the over-current of the DC/DC power supply chip,a high-precision oscillator with frequency shift is designed in this paper.When an overcurrent condition occurs in the chip,the oscillator frequency can be reduced to below 100 kHz.The circuit is simulated based on CSMC 0.25μm 30 V-60 V BCD process.A sawtooth wave with a signal amplitude of 0.6 V~3.2 V and a frequency of 260 kHz can be obtained at normal temperature.Temperature deviation is within ±4.23%,power supply sensitivity deviation is within ±1.6%.When the process corner deviation occurs,the frequency of the oscillator is corrected by fuse trimming.
作者
刘伟
王丹妮
黄东
顾鸣
商世广
LIU Wei;WANG Dan-ni;HUANG Dong;GU Ming;SHANG Shi-guang(Xi'an University of Posts and Telecommunications,Institute of Electronics and Engineering,Xi'an 710121,Shaanxi China)
出处
《微电子学与计算机》
2021年第4期29-34,共6页
Microelectronics & Computer
基金
陕西省自然科学基础研究计划项目(2020JM-583)
陕西省教育厅科研计划项目(18JK0714)。
关键词
振荡器
频率迁移
锯齿波
熔丝修调
Oscillator
frequency shift
sawtooth wave
fuse trimming
