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文章介绍了一种可编程的频率电压变换电路(F/V),将频率信号通过复杂可编程逻辑器件(CPLD)变换为与频率成正比的脉宽信号,脉宽信号控制模拟开关对基准电压信号进行斩波,斩波信号经低通滤波后输出直流电压信号。
In this paper, a programmable frequency voltage conversion circuit (F / V) is introduced. The frequency signal is converted into a pulse width signal proportional to the frequency by a complex programmable logic device (CPLD). The pulse width signal controls the voltage of the analog switch to the reference voltage Signal chopping, chopping signal output low-pass filtered DC voltage signal.