JPS6424622A - Level detection circuit - Google Patents

Abstract

PURPOSE:To facilitate the level detection by providing an OR circuit ORing a level detection signal obtained from a peak detector circuit and a level detection signal being a high frequency signal separated from the 2nd flip-flop circuit in a measuring electronic circuit network or the like. CONSTITUTION:Since a signal width of a low level is large and the signal width of a high level is increased gradually in a level detection signal masked at first, a terminal voltage across a capacitor 15, that is, a signal (k) has a signal form curved downward. Since the signal width is changed reversely in case of the signal masked at first in the level detection signal masked at the 2nd, the signal waveform is curved upward. The signal (k) is supplied a peak detector 17 and a peak detector circuit 17 detects the peak level of the signal (k) to extract the level detection signal (j). Then the signals (j) and (l) are inputted to an OR circuit 18, which outputs a level detection signal (m).