下图所示的三级对称有源电阻网络振荡器电路可以生成一个很好的三角波。在电路中，运放的内部输入级的电容特性不能忽视，运放的输入偏置电流周期性地充放电，因此可以不需要外部电容。振荡周期Ｔ可以表达为Ｔ＝ＡＣ，Ｃ是绝对温度，Ａ是一个常数，取决于运放的转换率、运放输 The three-stage symmetrical active resistor network oscillator circuit shown in the figure below produces a good triangular wave. In the circuit, the capacitive characteristic of the internal input stage of the operational amplifier can not be neglected. The input bias current of the operational amplifier is periodically charged and discharged, so that no external capacitor is needed. Oscillation period T can be expressed as T = AC, C is the absolute temperature, A is a constant, depending on the op amp’s conversion rate, op amp input