| 摘要 |
PURPOSE:To shorten signal OFF detection time after the state transition of eliminating an input signal from a large signal input state at a receiver for handling AC input signals from a small signal to a large signal. CONSTITUTION:This device is composed of an amplifier 101 to amplify the input signal, rectifier 102 to perform half wave rectification, integrator 103 to extract a DC voltage, and voltage comparator 104 provided with an amplitude limiter 300 for limiting the amplitude range of the signal inputted to the integrator 103 and a comparative voltage source, the amount of charges inputted to the integration circuit 103 is limited by passing the output of the rectifier 102 through the amplitude limit circuit 300, and signal OFF detection time is shortened at the time of the state transition when the input signal is rapidly eliminated from the large signal input time. |
