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对一基准正弦波取样,可以获得约在12个周期内,将压控振荡器锁定的控制电压。达样,不必用通常的积分电路,也无积分电路的附加延时(这两者往往是产生初始不稳定性的原因),就能使压控振荡器获得稳定的周期内电压。 60赫的基准频率加在电容器C_1上。取样开关在一定时间时将C_1的电压转换到电容器C_2上。取样时间应比基准信号的周期时间短,C_2应小于C_1。由取样电压控制压控振荡器。开始将振荡器频率调到等于基准频率与分频器分频系数的乘积,即调到6千赫(基准频率60赫×分频器分频系数100)。分频器的输出约60赫加到间歇振荡器,使取样开关每个周期工作一次。这样就使6千赫输
By sampling a reference sine wave, you get a control voltage that locks the voltage-controlled oscillator in about 12 cycles. For a sample, a VCO can be given a stable period voltage without having to use the usual integrator circuit and without the additional delay of the integrating circuit, both of which are often the cause of initial instability. The 60 Hz reference frequency is applied to capacitor C_1. The sampling switch converts the voltage of C_1 to the capacitor C_2 at a certain time. Sampling time should be shorter than the reference signal cycle time, C_2 should be less than C_1. Voltage-controlled oscillator controlled by sampling voltage. The oscillator frequency is tuned to equal the product of the reference frequency and the divider divider factor, which is set to 6 kHz (reference frequency of 60 Hz × divider division factor of 100). The output of the divider is added to the intermittent oscillator at about 60 Hz, causing the sampling switch to operate once per cycle. This makes 6 kHz lose