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提出了一种基于标准双极工艺、能同步外部时钟的低成本RC振荡器。由于采用迟滞技术和高压双极型工艺,振荡周期对温度、电压及工艺偏差均有很好的宽容度,且周期大小易于调整。在输入电压为5～40 V、-55℃～125℃温度范围,以及三个电阻工艺偏差的情况下,进行HSPICE仿真。结果表明,在最坏情况下,振荡器周期的最大偏差为9.8%;在不考虑温度的情况下,由电压和电阻工艺偏差引入的振荡周期最大偏差为5.6%。该振荡器满足电源管理芯片要求,适合低成本AC-DC、DC-DC转换器和充电器等电源管理芯片的应用。
A low cost RC oscillator based on a standard bipolar process that can synchronize an external clock is proposed. Due to the hysteresis technology and high-voltage bipolar process, the oscillation period has good tolerance to temperature, voltage and process deviation, and the cycle size is easy to adjust. In the input voltage of 5 ~ 40 V, -55 ℃ ~ 125 ℃ temperature range, as well as three resistance process deviation case, the HSPICE simulation. The results show that in the worst case, the maximum deviation of the oscillator cycle is 9.8%. The maximum deviation of the oscillation period introduced by the voltage and resistance process deviation is 5.6% without considering the temperature. The oscillator to meet the power management chip requirements for low-cost AC-DC, DC-DC converters and chargers and other power management chip applications.