Phase-locked loop frequency synthesizer
A technology of frequency synthesizer and phase-locked loop, applied in automatic control of power, electrical components, etc., can solve problems such as slow capture, achieve the effect of accelerating the locking process and expanding the range of linear tracking
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[0037] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention.
[0038] Compared figure 1 and figure 2 , it can be seen that the PLL frequency synthesizer according to the embodiment of the present invention adds a charge pump extension circuit 204 and a phase detector frequency detector extension circuit 202 on the basis of the traditional PLL frequency synthesizer. Wherein, the charge pump expansion circuit 204 includes: a first current source module, connected in parallel with the upper power supply, for providing current together with the upper power supply after triggering; and a second current source module, connected in parallel with the lower power supply, for triggering Then provide current together with the lower power sup...
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