| 摘要 |
The circuit for analyzing the received signals having different pulse widths but same frequency comprises an amplifier (10), a schmitt triger circuit (20) for preventing the abnormal operation caused by the noise, a comprator (30), a pulse oscillator (40), a decoder (50), an output driving circuit (60), a constant voltage circuit (70), a rectifier (150), and a ripple dividing circuit (160). The rectifier provides a quenching and a noise signal when receiving no carrier signal, but provides a quenching singal only when receiving the carrier signal because the rectifier is resonated with the carrier frequency.
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