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

Frequency synthesizer with hit-less transitions between frequency- and phase-locked modes
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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