Monostable multivibrator having minimal recovery time
AssigneeFairchild Camera and Instrument Corporation
InventorJames Ren-Jke Kuo
Life of this patent
Estimating the term…
Abstract
A monostable multivibrator has improved output control by minimizing the recovery time of a transistor pair and using a voltage comparator for comparing the recharging voltage of the timing network with a reference for output signal development. Recovery time is minimized by employing a Darlington circuit for accelerating discharge of the timing network in response to the trigger signal to the monostable transistor pair, whereby the voltage comparator generates an output signal which is a function primarily of recharging time of the timing network.
Claims6
A monostable multivibrator with improved timing control comprising:
- a. a pair of transistors interconnected whereby one transistor is conductive when the other transistor is nonconductive and wherein said transistors have a stable state and an unstable state,
- b. resistive-capacitive means interconnected with said pair of transistors for establishing the time period of said unstable state,
- c. means operably connected with said transistors for triggering said pair of transistors to said unstable state and effecting a discharge of said resistive-capacitive means, said pair of transistors reverting to said stable state when said resistive-capacitive means discharges to an established voltage level whereupon said resistive-capacitive means begins recharging,
- d. voltage comparator means operably connected to said resistive-capacitive means for comparing the voltage charge of said resistive-capacitive means with a reference voltage and developing an output signal responsive to said comparison, and
- e. means operably connected to said resistive-capacitive means for accelerating the discharge of said resistive-capacitive means whereby the recharge time period is much longer than the discharge time period, including a Darlington circuit interconnected with said means for triggering and said resistive-capacitive means whereby said resistive-capacitive means discharges through said Darlington circuit.
A monostable multivibrator with improved timing control comprising:
- a. a pair of transistors interconnected whereby one transistor is conductive when the other transistor is nonconductive and wherein said transistors have a stable state and an unstable state,
- b. resistive-capacitive means interconnected with said pair of transistors for establishing the time period of said unstable state,
- c. means operably connected with said transistors for triggering said pair of transistors to said unstable state and effecting a discharge of said resistive-capacitive means, said pair of transistors reverting to said stable state when said resistive-capacitive means discharges to an established voltage level whereupon said resistive-capacitive means begins recharging,
- d. voltage comparator means operably connected to said resistive-capacitive means for comparing the voltage charge of said resistive-capacitive means with a reference voltage and developing an output signal responsive to said comparison,
- e. means operably connected to said resistive-capacitive means for accelerating the discharge of said resistive-capacitive means whereby the recharge time period is much longer than the discharge time period, and,
- f. output gate means operatively connected with said means for triggering whereby an output pulse is generated in response to a trigger signal, said output gate means operatively connected with said voltage comparator means for terminating said output pulse in response to an output signal from said voltage comparator means.
Dependencies are inferred from the claim text.