Patent ID: 6057739
Filing Date: 2000-05-02
Classification: G06F,H03L

Abstract:
An electronic system comprising:a phase-locked loop (PLL) having a PLL parameter modification circuit to receive PLL parameter modification data and to modify an operational parameter of the PLL in accordance with the PLL parameter modification data;wherein the PLL parameter modification circuit further comprises:a programmable current source to provide at least an UP charge pump output control signal and a DOWN charge pump output control signal; andwherein the programmable current source further comprises:a control current source to provide a reference current;an UP control current source to provide the UP charge pump output control signal;a DOWN control current source to provide the DOWN charge pump output control signal; andprogrammable circuitry to modify a ratio between the reference current and the UP and DOWN charge pump output control signals, wherein the ratio between the reference current and the UP and DOWN charge pump output control signals is a programmable ratio in accordance with the parameter modification data.