Patent ID: 6995604

Claim:
A communication system for transmitting data in the form of short data packets (bursts), the communication system including a phase-locked loop (PLL) with a charge pump, the charge pump including a current source circuit for generating a low-noise current, the communication system comprising: a current mirror circuit, containing: transistors, including a first transistor and a second transistor, said transistors each having a source connection, a drain connection, and a gate connection; a capacitance connected between said source connection and said gate connection of said second transistor; and a switching element connected between said drain connection of said first transistor and said gate connection of said second transistor and controlled in dependence on an operating state of the current source circuit; a switching element control device for controlling the switching element; an operations monitoring device corresponding to a burst control device of the communications system; and said switching element control device and said operations monitoring device being disposed to close said switching element at the beginning of each reception or transmission burst for a duration of a switched-on phase of the current source circuit.