Patent ID: 8797088

Claim:
A device coupled to a charge pump unit for feedback control, the charge pump unit comprising a plurality of switches and at least one capacitor, and also receiving an input voltage so as to generate an output voltage, the device comprising: a compensation unit coupled to the charge pump unit, receiving the output voltage and generating an error signal accordingly, the compensation unit comprising: an impedance; and an amplifier, the amplifier comprising: an output end; a positive input end, coupled to a reference voltage; and a negative input end, coupled to the charge pump unit and a modulation unit, wherein the impedance couples across the negative end and the output end of the amplifier, and compensates the output voltage for stability to generate the error signal; the modulation unit, coupled to the compensation unit, receiving and modulating the error signal, and correspondingly generating a modulation signal, wherein the modulation unit is a voltage controlled oscillator (VCO), coupled to the compensation unit for receiving the error signal, and generating the modulation signal using pulse frequency modulation according to the error signal; and a phase control unit, coupled between an input end of the charge pump unit and an output end of the modulation unit, the phase control unit receiving the modulation signal, generating a plurality of phase signals to control the switches of the charge pump unit so that the input voltage charge/discharge at least one of the capacitors of the charge pump unit and generating the output voltage accordingly, the plurality of generated phase signals comprising at least three separate phase signals generated based on the received modulation signal.