Invention Grant
- Patent Title: Analog phase-locked loop with enhanced acquisition
- Patent Title (中): 模拟锁相环增强采集
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Application No.: US14362563Application Date: 2012-11-14
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Publication No.: US09252786B2Publication Date: 2016-02-02
- Inventor: Staffan Ek
- Applicant: Telefonaktiebolaget LM Ericsson (publ)
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget L M Ericsson (publ)
- Current Assignee: Telefonaktiebolaget L M Ericsson (publ)
- Current Assignee Address: SE Stockholm
- Agency: Murphy, Bilak & Homiller, PLLC
- Priority: EP11192433 20111207
- International Application: PCT/EP2012/072638 WO 20121114
- International Announcement: WO2013/083376 WO 20130613
- Main IPC: H03L7/10
- IPC: H03L7/10 ; H03L7/087 ; H03L7/089 ; H04B1/40

Abstract:
An analog phase-locked loop, PLL, (100, 200) is disclosed, comprising a voltage controlled oscillator (102, 202); a frequency divider (104, 204) having its input connected to an output of the VCO; a first phase detector (106, 206) arranged to detect a phase difference between an output signal of the frequency divider and a reference frequency signal and provide an output signal based on the phase difference, wherein the detectable phase difference is within one cycle of the reference frequency; a first charge pump (108, 208) connected to an output of the first phase detector and arranged to output a charge per detected phase error based on the output of the first phase detector; and an analog loop filter (110, 210) connected to the first charge pump and arranged to provide a voltage, based on the output of the first charge pump, to the VCO. The PLL further comprises a second phase detector (112, 212, 300, 400, 500) arranged to detect a number of cycles in phase difference between the output signal of the frequency divider and the reference frequency signal and provide an output signal based on the number of cycles in phase difference; and a second charge pump (114, 214, 600, 700) connected to an output of the second phase detector and arranged to provide a charge per detected phase error, based on the output of the second phase detector, to the loop filter. A radio circuit, a communication device and a communication node are also disclosed.
Public/Granted literature
- US20150004919A1 Analog Phase-Locked Loop with Enhanced Acquisition Public/Granted day:2015-01-01
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