2 results about "Charge pump phase locked loop" patented technology

This application relates to the field of electronic circuit technology, providing a current-steering charge pump circuit and a charge pump phase-locked loop. The current-steering charge pump circuit includes: a reference current mirror connected to the analog circuit's positive power supply, current source, first switch, and the non-inverting input of the first rail-to-rail operational amplifier; a discharge current mirror connected to the first switch, the output of the first rail-to-rail operational amplifier, a second switch, a fifth switch, a seventh switch, and analog ground; a charging current mirror connected to the analog circuit's positive power supply, a third switch, a fourth switch, a sixth switch, and the output of the second rail-to-rail operational amplifier; a third switch connected to the second switch and the non-inverting input of the second rail-to-rail operational amplifier; and a fourth switch connected to the fifth switch and the output of the third rail-to-rail operational amplifier. This circuit can increase the output voltage swing while ensuring that the charging and discharging currents are equal.

The application discloses a charge pump phase-locked loop and relates to the field of phase-locked loops. In order to solve the problem that a traditional charge pump phase-locked loop cannot effectively reduce VCO output phase noise while ensuring normal operation of the charge pump, the application provides a charge pump phase-locked loop. The charge pump phase-locked loop is structured by a new type of analog phase detector + charge pump, and the difference between mirror currents of the charge pump generated by a reference clock signal and a feedback clock signal in different phase stages is used to charge / discharge a loop filter. The charge pump phase-locked loop can meet stable control of a control voltage of the loop filter, and CMOS switches are not needed. Therefore, the adverse effects caused by clock feedthrough and charge injection can be obviously reduced, and the normal operation of the charge pump phase-locked loop is not affected.