| 摘要 |
Two semiconductor diodes are serially interconnected across a ratio detector in the same polarity. When the detected output from the ratio detector reaches a predetermined magnitude, both diodes are conducting and the detected output is taken from the junction of the diodes. When the detected output from the ratio detector falls due to a lower received signal level, an increase in noise level is ordinarily experienced. Because the output of the ratio detector is lower, the diodes are no longer fully conductive. This causes an increase in output impedance and a corresponding reduction in noise output.
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