| 摘要 |
PURPOSE:To enable the accurate and rapid detection of the rising width of an input signal, by triggering an input signal at two threshold levels and performing weighting during a triggering period. CONSTITUTION:An input signal is amplified to a supersaturation signal 1 by an amplifier circuit 150 while said signal is applied to first and second threshold circuits 102, 104 having threshold values VT1, VT2 while the circuit 102 supplies an output rectangular wave 3 to an AND gate 106, an EXOR gate 108 and a falling detection circuit 110. The gate 106 supplies a number of clock pulses corresponding to a period during which a signal 3 exceeds the value VT1 to a first counter circuit 118 and the gate 108 forms a pulse 4 corresponding to a period during which the signal 3 is present between the values VT1, VT2 while the gate 114 imparts a clock pulse during the period of the pulse 4 to a second counter circuit 120 and the circuit 110 supplies the detection signal in the falling of the signal 3 to an operation processing circuit 116. The circuit 116 performs weighting due to constant K {K=(VT2-VT1)/VT2} to one counting output and adds said output to the other counted value to impart the added value to a display device 122. |
