简单的方波输出正交发生器

• 作 者: 胡碧
• 出 处: 实用电子文摘
• 发表日期: 1997年02期
• 关键词: 运算放大器 电源电压 不对称性 占空比 指数变化

本RC振荡器能产生相位差为90°、占空比为1∶1的90Hz方波。当门输入为低电位时开始工作,二极管D能补偿运算放大器的不对称性。相位差小于5%,频率约为0.36/CR。因为所有阀值与电源电压成正比,故频率几乎不受Vcc变化的RC影响。电压Vj在此周期内变化,可补偿按指数变化的RC充电曲线。此简单的发生器适合驱动器进电机。图中运放为LM324,D为1N4148。

The RC oscillator produces a 90Hz square wave with a phase difference of 90 ° and a duty cycle of 1: 1. When the gate input is low when work, diode D can compensate for the operational amplifier asymmetry. The phase difference is less than 5% and the frequency is about 0.36 / CR. Because all thresholds are proportional to the supply voltage, the frequency is almost unaffected by the RC of Vcc changes. The voltage Vj changes during this period to compensate for exponential RC charging curves. This simple generator fits into the drive into the motor. The op amp for the LM324, D is 1N4148.