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如图所示的自由振荡脉冲发生器,有几个特点,可作多种应用。该电路简单、对称并有一个50Ω输出阻抗,脉冲宽度为100ns,并且为互补输出,电路的输出幅值从地到电源电压。此外,它的功能是在小于1V到大于15V这样的一个电源范围里工作。它具有一个低电压、低温度漂移,而且消耗功率小。为了使振荡器产生振荡,每个晶体管的增益必须大于1。这就限制了R值应在1K到1MΩ这样一个范围里。当晶体管是处于饱和或者β值是低的时候(由于收集极电流小),增益仍然是低于1。这两个RC时间网络不需要匹配,因为具有长时间常数的RC将决定振荡器的
As shown in the free-running pulse generator, there are several features that can be used for a variety of applications. The circuit is simple, symmetrical and has a 50Ω output impedance, pulse width of 100ns, and for the complementary output, the circuit's output amplitude from ground to supply voltage. In addition, it functions in a power range of less than 1V to more than 15V. It has a low voltage, low temperature drift, and low power consumption. In order for the oscillator to oscillate, the gain of each transistor must be greater than one. This limits the R value should be in the range of 1K to 1MΩ. When the transistor is saturated or the value of β is low (due to the collector current is small), the gain is still below 1. The two RC time networks do not need to be matched because an RC with a long time constant will determine the oscillator's