| 摘要 |
PURPOSE:To obtain a normal detection output without phase distortion even with a level variance in an input signal, by applying a detection signal and a signal obtained through the differentiation of the said detection signal to a differential amplifier. CONSTITUTION:An AM demodulation wave is amplified at an amplifier 2 after band limit at a band filter 1, and applied to one input terminal of a differential amplifier 9 after being rectified at a rectifying circuit 3. The rectified output of the circuit 3 is picked up via a differentiation circuit 5, rectifying circuit 6, and OR circuit 8 and applied to another input terminal of the amplifier 9. A constant voltage is applied to another input of the OR circuit 8 from a fixed bias power supply 7, and a detection signal without effect of signal level variance of signal can be obtained from the output of the differential amplifier 9 by adjusting this fixed bias voltage. |
