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Phase-locked loop circuit having deadlock prevention circuit and deadlock prevention method thereof
Phase-locked loop circuit having deadlock prevention circuit and deadlock prevention method thereof
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机译:具有防死锁电路的锁相环电路及其防死锁方法
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摘要
A phase locked loop (PLL) circuit having a deadlock protection circuit and a deadlock protection method of the PLL circuit are provided. The PLL circuit includes: a phase frequency detector, which receives an input clock signal and a divided clock signal and compares the phase and frequency of the input clock signal with the phase and frequency of the divided clock signal; a charge pump, which receives an output signal of the phase frequency detector; a voltage-controlled oscillator, which oscillates in response to an output voltage of the charge pump; a main divider, which divides the frequency of an first output clock signal of the voltage-controlled oscillator and outputs the divided clock signal as the division resu and a deadlock protection circuit, which is electrically coupled to an output port of the voltage-controlled oscillator and an input port of the main divider, and divides the frequency of the first output clock signal of the voltage-controlled oscillator and then provides the division result to the main divider if the frequency of the first output clock signal of the voltage-controlled oscillator is above a threshold frequency.
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