Method and apparatus for increasing voltage in a charge pump used in a phase locked loop

摘要

An apparatus and method of increasing the voltage of a charge pump (111) used in a synthesizer charge pump network (100). The invention enables a voltage boost network (123) to be connected to a charge pump (111) and utilizes a capacitor which is charged and discharged synchronously with the charge pump to allow the charge pump (111) to effectively operate at a higher voltage than ordinary supply (V2). The invention allows the synthesizer charge pump network (100) to be operated in a low voltage condition without providing switching of external voltages greater than supply thereby eliminating EMI and increasing operating efficiency.