| 摘要 |
A system for comparing, measuring, or providing a reference signal based on a oscillator having variable loop gain is described. Only when the oscillator loop gain is at least the value of one does the oscillator produce an AC output signal. The oscillator's ability to oscillate is controlled by the one or more sensor/transducer input signal levels. In some cases, negative feedback of the AC output signal is also used to control the loop gain of the oscillator circuit keeping the loop gain at or close to the value of one. The system's output signal indicates whether the oscillator is oscillating or not, or the AC signal level required to just maintain oscillation.
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