| 摘要 |
A phase locked loop arrangement (1) beamformingcomprises two or more phase locked loops. The loops include a phase comparator (21, 22) and an adjustable charge pump arrangement (31, 32) having a loop filter (51, 52) and charge pump current source (41, 42) with an adjustment input (ϕadj) connected to the loop filter (51, 52) to inject an adjustable charge pump current into the loop filter. A constant current source (71, 72) is configured to inject a first predetermined charge current into the loop filter (51, 52). The adjustable charge pump arrangements (31, 32) are connected to the respective phase comparators(21, 22) to provide a voltage control signal (vctrl) to an oscillator (61, 62) of the respective phase adjustable phase locked loop (11, 12)in response to the respective control signal (up, down) and to generate a phase deviation between the first and one of the at least one second oscillator signals (fosc1,fosc2) based on an adjustment signal applied to the adjustment input (ϕadj). |
