| 摘要 |
In a phase control loop, an output signal which is used to control an oscillator in a PLL or a phase-delay device in a DLL is generated by means of a phase/frequency detector. In accordance with the invention, the oscillator or the phase-delay device is controlled by means of a control signal which is made up of a controlling component and an adjusting component. The controlling component is generated as a proportional function of the output signal, whereas the adjusting component is generated as a proportional function of the low-pass-filtered output signal. At low frequencies, the loop gain is higher in this case for generating the adjusting component than for generating the controlling component, which means that the output signal and the component parts through which it passes can be operated at their optimum operating point, at the centre of the range of variation for example. The adjusting component may be generated by both analog and digital procedures.
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