| 摘要 |
An adjustable bandwidth phase-locked loop (100) including a phase-locked loop having a first input node receiving an input signal (114) having a first frequency, a second input node receiving a feedback signal (116) and an output node (118) which has a signal indicative of an error signal characterizing a frequency error between the input signal and the feedback signal. The adjustable bandwidth phase-locked loop includes a voltage controlled oscillator (130), coupled to the second input node, receiving the error signal and generating the feedback signal where the feedback signal has a frequency which tracks the first frequency. The adjustable bandwidth phase-locked loop includes a variable loop filter (120, 135, and 140), coupled between the phase-locked loop and the voltage controlled oscillator, filtering the error signal. The variable loop filter is configurable to allow for the tracking of the input signal over both of a broad bandwidth and a narrow bandwidth.
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