| 摘要 |
<p>PURPOSE:To reduce noise, and also, to stabilize an amplitude limiting operation by supplying differentially each of the output of a first timing extracting element and the output of a second timing extracting element to an amplitude control circuit. CONSTITUTION:An output signal of a full-wave rectifying circuit 1 is supplied to a timing extracting element 3 and a timing extracting element 4 having a response being 180 deg. out of phase with said timing extracting element 3, respectively. Each of the output of the timing extracting element 3 and an output of the timing extracting element 4 is supplied to an amplitude limiting circuit 2. Since the output signal is 180 deg. out of phase with the input signal of the timing extracting elements 3, 4 the amplitude limiting circuit operates differentially. Accordingly, the noise from a power source and a noise superposed onto a signal line are reduced due to the same phase mode suppressing effect by the differential operation. Also, the amplitude limiting circuit 2 operates stably due to a face that a differential gain portion is further obtained.</p> |
