| 摘要 |
An apparatus (200) includes a filter (220) and a gain control circuit (250). The filter (220) receives and filters an input signal and provides an output signal in a first mode and operates as part of an oscillator in a second mode. The gain control circuit (250) varies the amplitude of an oscillator signal from the filter (220) in the second mode, e.g., by adjusting at least one variable gain element within the filter (220) in the oscillator second mode to obtain a target amplitude and/or non rail- to-rail signal swing for the oscillator signal. The apparatus (200) may further include a bandwidth control circuit (280) to adjust the bandwidth of the filter (220) in the second mode. The bandwidth control circuit (280) receives the oscillator signal, determines a target oscillation frequency corresponding to a selected bandwidth for the filter, and adjusts at least one circuit element (312, 314, 316, 318, 322, 324) within the filter to obtain the target oscillation frequency. |
