PURPOSE: To attain a monostable multivibrator with high speed, by connecting a diode in parallel between the base and emitter of an inverter transistor (TR) of a bistable multivibrator.
CONSTITUTION: Diodes D6∼D9 are connected respectively in parallel between the base and emitter of the inverter TRs Q1∼Q4 of the bistable multivibrator and the D6 and the Q1, the D7 and the Q2, the D8 and the Q3 and the D9 and the D4 are formed respectively as the current mirror coupling. In impressing a trigger pulse to a terminal T3, the same current flows to the D9 and the Q4, a potential at a point (b) is nearly at a ground potential, a TRQ7 is turned off, a capacitor Ct is charged with a resistor Rt, the current to the Q2, the Q7 is zero and the potential at a point (a) goes to a high level. When the potential at the Ct reaches a comparison voltage VREF of a voltage comparison circuit comprising TRs Q8, Q9, a current of a TRQ10 flows to the D5, the TRQ11 turns on, a current flows to the D6 and the Q1, the potential at the point (a) reaches nearly the ground potential, the current to the Q3 and the D7 is zero, and the potential at the point (b) is increased rapidly to turn on the TRs Q12, Q7 so as to discharge rapidly the charge of the Ct. Since the Q1∼Q4 are unsaturated because of the D6∼D9, high speed is attained.
| JPS53145456 | OSCILLATOR CIRCUIT |
IKEGAMI ICHIROU
HAYASHI TAKAHARU
OOURA KENKICHI
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