Invention Grant
US08786341B1 Frequency synthesizer with hit-less transitions between frequency- and phase-locked modes
有权
频率合成器具有频率和锁相模式之间的无跳跃转换
- Patent Title: Frequency synthesizer with hit-less transitions between frequency- and phase-locked modes
- Patent Title (中): 频率合成器具有频率和锁相模式之间的无跳跃转换
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Application No.: US13833360Application Date: 2013-03-15
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Publication No.: US08786341B1Publication Date: 2014-07-22
- Inventor: Colin Weltin-Wu , Yunteng Huang
- Applicant: Silicon Laboratories Inc.
- Applicant Address: US TX Austin
- Assignee: Silicon Laboratories Inc.
- Current Assignee: Silicon Laboratories Inc.
- Current Assignee Address: US TX Austin
- Agency: Abel Law Group, LLP
- Main IPC: H03L7/06
- IPC: H03L7/06

Abstract:
A digital frequency synthesizer provides absolute phase lock and shorter settling time through the use of a digital filter with a phase and frequency path. Control logic control disables the frequency path during the frequency acquisition and sets a wide bandwidth. After frequency acquisition, a counter with digital phase information is reset using the input clock signal to bring the output phase closer to lock with the input signal and the control logic enables the phase path in the digital loop filter to achieve phase lock with a narrower bandwidth than the initial bandwidth.
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