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提出了一种结构简单、电源电压宽、精度高的振荡器。利用系统的基准偏置电流对电容进行充放电,并且与该偏置电流作用在电阻上的电压进行比较,产生680kHz的方波信号。该电路在电源电压大于2.2V时,就可得到高精度的振荡频率。采用0.5μm OKI工艺,利用Hspice和Cadence对电路进行仿真。在芯片系统典型应用环境下仿真得到振荡频率为680kHz;电源电压在2.2~6V,温度为-40℃~85℃变化范围时,振荡频率的范围为663~707kHz,最大偏移量为+3.97%;电压为5V时,该振荡器振荡频率的偏移在±1.18%以内。
An oscillator with simple structure, wide supply voltage and high precision is proposed. The system’s base bias current is used to charge and discharge the capacitor and is compared to the voltage at which the bias current acts on the resistor to produce a 680kHz square wave signal. The circuit in the supply voltage is greater than 2.2V, you can get high-precision oscillation frequency. Using a 0.5μm OKI process, the circuit was simulated using Hspice and Cadence. The oscillation frequency is 680kHz under the typical application of the chip system. When the power supply voltage is between 2.2 ~ 6V and the temperature is between -40 ℃ ~ 85 ℃, the oscillation frequency range is 663 ~ 707kHz and the maximum offset is + 3.97% When the voltage is 5V, the oscillation frequency of the oscillator shifts within ± 1.18%.