Invention Grant
US07567644B2 Phase-lock loop, method for frequency switching in a phase-lock loop, and use of said phase-lock loop 有权
锁相环,锁相环中的频率切换方法以及所述锁相环的使用

Phase-lock loop, method for frequency switching in a phase-lock loop, and use of said phase-lock loop
Abstract:
The invention relates to a phase comparison circuit including a reference input and a feedback input, and an output provided with a controlled oscillator which is connected thereto. A frequency divider with an adjustable division ratio resides in the feedback path of the phase-lock loop. The phase-lock loop includes a frequency adjusting arrangement having a first and a second control input, a first output which is connected to the frequency divider and is used to generate a digital regulating signal, and a second output which is coupled to the controlled oscillator and is used to generate an analog control signal. The first control input is embodied in such a way as to adjust a frequency of the phase-lock loop, and the second control input is embodied in such a way as to switch the frequency of the phase-lock loop according to a frequency offset. The phase-lock loop can advantageously be used to compensate frequency offsets of received signals.
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