That extra voltage is used by a neighboring device, called a ring oscillator, to create a string of electrical pulses.
相邻的设备(称为环形振荡器)使用额外的电压来产生一串电脉冲。
英语百科
Ring oscillator
A ring oscillator is a device composed of an odd number of NOT gates whose output oscillates between two voltage levels, representing true and false. The NOT gates, or inverters, are attached in a chain and the output of the last inverter is fed back into the first.