| 摘要 |
In some implementations, an apparatus includes a filter circuit that receives an input signal and generates in response a filtered signal; and a comparison circuit that receives the input signal and the filtered signal, and outputs in response a comparison output signal having a first level when a magnitude of the filtered signal is less than or substantially equal to a magnitude of the input signal and a second level when the magnitude of the filtered signal is greater than the magnitude of the input signal. The filter circuit can be configured to generate the filtered signal including applying a first transfer function to the input signal when the magnitude of the input signal is substantially constant or increasing, and applying a second transfer function to the input signal when the magnitude of the input signal is decreasing.
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