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本发明介绍一种自动保持扫描VCO(压控振荡器)中心频率的系统。在已知扫描电压输入的幅度上激励锁定脉冲。振荡器输出频率经分频器除以N后与基准信号一起加到相位和/或频率检测器。检测到的信号在锁定脉冲控制下经选通电路加到记忆装置,它的输出被用来保持中心频率。
The present invention describes a system for automatically maintaining the center frequency of a swept VCO (Voltage Controlled Oscillator). The lock pulse is excited at the magnitude of the known scan voltage input. The oscillator output frequency is divided by the divider by N and applied to the phase and / or frequency detector along with the reference signal. The detected signal is applied to the memory device via the gated circuit under lock pulse control and its output is used to maintain the center frequency.