Invention Grant
- Patent Title: Phase locked loop arrangement, transmitter and receiver and method for adjusting the phase between oscillator signals
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Application No.: US15580046Application Date: 2015-06-11
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Publication No.: US11309901B2Publication Date: 2022-04-19
- Inventor: Tony Påhlsson , Staffan Ek , Henrik Sjöland
- Applicant: Telefonaktiebolaget LM Ericsson (publ)
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee: Telefonaktiebolaget LM Ericsson (publ)
- Current Assignee Address: SE Stockholm
- Agency: Murphy, Bilak & Homiller, PLLC
- International Application: PCT/EP2015/063109 WO 20150611
- International Announcement: WO2016/198116 WO 20161215
- Main IPC: H03L7/23
- IPC: H03L7/23 ; H03L7/089 ; H03L7/091 ; H01Q3/34

Abstract:
A phase locked loop arrangement (1) beamforming comprises 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).
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