Loading patent…
AssigneeUniversity of Electronic Science and Technology of China
InventorsJian Fang, Yaoyao Jia, Tongwei Yuan, Hua Pan
Estimating the term…
A charge pump circuit used for a charge pump phase-locked loop that includes a charging and discharging unit, two complementary circuit units, two operational amplifier units, an inverter unit, and a current mirror unit. The charge pump circuit resolves the matching problem of charging and discharging currents and the charge sharing problem in existing charge pump circuits. Both complementary circuit units positively and reversely compensate the charging and discharging unit to keep the charging and discharging currents of capacitors constant. Thus, the problem of the change of charging and discharging currents is resolved, the voltage linear variation of the charge pump capacitors is achieved, and the charging and discharging of the capacitors can be accurately controlled. The charge pump circuit is simple in structure, easy to integrate, high in the matching precision of the charging and discharging current sources, and suitable for low voltage and low power consumption applications.
A charge pump circuit for a charge pump phase-locked loop, comprising:
Dependencies are inferred from the claim text.