A method for matching the charge current in a charge pump of a phases as well as phase locked loop for this purpose, generally loop

摘要

A method for matching the charge current in a charge pump of a phase locked loop, which has:Providing a pair of direct current sources (20, 21), which is a regulated direct current source (21) comprises;Providing a fully differential phases as a rule, the grinding filter (34) with a first and a second input;Application of current of the direct current sources (20, 21) to the first and the second input of the phases as a rule, the grinding filter (34) by means of switches (28, 29, 30, 31, 32, 33) under the control of a switching control of the turbocompressor (19) in response to signals from a phase detector;Detecting a common mode $(vcp\; +\; of)\; /\; 2$ of the first and of the second input;Comparing the common mode voltage $(vcp\; +\; of)\; /\; 2$ with a reference voltage (of _ ref); andControl of the regulated direct current source (21) in a sampling - regulation loop (100) with a feedback signal, which is made of the common-mode voltage of the first and second input is derived, in order to keep the common-mode voltage at a value, which is fixed by the reference voltage, and the bandwidth of the sampling - regulation loop (100) of low..