| 摘要 |
A closed-loop power control system includes an analog input and an analog output. An analog signal applied to the analog input is summed with an analog signal derived from the analog output to produce a difference signal representative of the polarity of the difference between the analog input signal and the derived analog output signal. A digital signal is produced representative of the polarity of the difference signal. The system includes at least two switching networks, having high energy outputs, and which are responsive to the digital signal to reduce the levels of the difference signal in a frequency band of interest at the source of the digital signals. A low-pass filter is included between the high energy outputs and the means to produce the digital signal to attenuate high frequency noise. The phase lag created by a low-pass passive filter at the output of the high energy outputs is, in one embodiment, reduced by a high-pass filter to maintain stability. Instability that may occur in the presence of large amplitude signals is avoided by the use of a clipping circuit.
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