论文部分内容阅读
同频率的两个波形之间的相位差通常是采用异或电路将输入信号转换成方波来测得,异或门输出的平均值与相位差戍比例。这个方法可测量0～180℃的相位,但不能指示相位超前或滞后的方向。图1所示的电路就是上述方案的变形,该电路可测量0～±180°的相位。产生的方波信号A和B送至D触发器,当输入1超前输入2时,触发器输出C为逻辑1;当输入1滞后输入2时,输出为逻辑0。在输出运放电路中,D触发器的输出C用来控制晶体管2N2369的导通和关断。当C为逻辑0时,运算放大器输出F为正且与异或电路输出的平均值E成正比;当C为逻辑1时,F为负,
The phase difference between the two waveforms of the same frequency is usually obtained by converting the input signal into a square wave using an exclusive OR circuit. The ratio of the average value of the exclusive OR gate output to the phase difference is measured. This method can measure the phase 0 ~ 180 ℃, but can not indicate the direction of phase advance or lag. The circuit shown in FIG. 1 is a variation of the above solution, which can measure the phase from 0 to ± 180 °. The resulting square-wave signals A and B are sent to the D flip-flop. When input 1 leads input 2, the output C of the flip-flop is logic 1; when input 1 hysteresis is input 2, the output is logic 0. In the output op amp circuit, the D flip-flop output C is used to control the transistor 2N2369 on and off. When C is logic 0, the op amp output F is positive and proportional to the average E of the output of the XOR circuit. When C is logic 1, F is negative,