| 摘要 |
Disclosed is a phase locked loop having a plurality of negative feedback loops, which comprises: a first negative feedback loop for locking a predetermined frequency and a predetermine phase of an output signal by comparing a divided signal of the output signal outputted from a voltage control oscillator with a reference signal to output voltage corresponding to the frequency difference and the phase difference; and a second negative feedback loop formed as a negative feedback loop different from the first negative feedback loop, and formed with a generation switch and a generation capacitor performing a role as a negative feedback to an output signal of an external loop filter of the first negative feedback loop. |
