| 摘要 |
PURPOSE: To instantaneously adjust a threshold level according to high and low specified levels and the threshold of a window generator. CONSTITUTION: An input signal is transmitted on a line 58 and supplied to a rectifier 60 and a window generator 62. The window generator 62 compares the input signal with a voltage threshold and when the input signal exceeds the threshold, a high level output on a line 64 is applied. Then, the signal from the rectifier 60 is compared with a high certified level 68 and a low certified level 70 by a logic circuit 66 composed of a comparator and a latch circuit. The output of the logic circuit 66 controls a current source 72, changes the voltage threshold of the window generator 62 and is supplied to an input for enabling a peak detection system. Besides, the high and low certified levels 68 and 70 are applied by an automatic gain control level shift circuit 74. |
