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“电压-频率转换电路”(图1)是将线性电压从零伏到3伏的变化,通过一个简易的转换电路得到每秒从零次到1千赫的重复频率。它的线性在0.3％左右,稳定度主要是决定于电源电压。转换电路是由BG_1、BG_2、BG_3组成,BG_1是发射极跟随器,BG_2是作为电流源,当信号电压进入BG_2基极时,则BG_2相应地在集电极产生电流对电容器C_A充电,引起BG_3达到峰点,并通过BG_3的发射极e和第一基极b_1及360欧电阻放电,同时在BG_3的b_1极输出正脉冲,b_2极输出负脉冲。输出脉冲数与输入线性
The “voltage-to-frequency conversion circuit” (Figure 1) converts the linear voltage from zero volts to 3 volts, giving a repetitive frequency of zero to one kilohertz per second through a simple conversion circuit. Its linearity is about 0.3%, the stability is mainly determined by the power supply voltage. The conversion circuit is composed of BG_1, BG_2 and BG_3. BG_1 is the emitter follower. BG_2 is used as the current source. When the signal voltage enters the base of BG_2, BG_2 correspondingly generates current at the collector to charge capacitor C_A, causing BG_3 to reach Peak and discharge through BG_3 emitter e and the first base b_1 and 360 ohm resistor discharge, at the same time BG_3 b_1 pole output positive pulse, b_2 pole output negative pulse. Output pulse number and input linearity