US3582687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monostable and astable multivibrator apparatus including differential amplifier, rc network and switch means for initiating and terminating output pulses
Assignee: Massachusetts Institute of Technology
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Filing: 1969-07-15
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Granted: 1971-06-01
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Expires: 1989-07-15
Abstract
Abstract Monostable multivibrator apparatus (one shot) is disclosed which was conceived to fill the need for a reliable, stable, low-power pulse generator that is not sensitive to temperature and supplyvoltage variations. In one embodiment, two of the monostable multivibrators are connected in a closed-loop configuration for use as an astable low frequency clock generator. To provide stability the monostable includes a differential amplifier having one input connected to a reference input voltage (midpoint of a resistance voltage divider), the other input receiving a pulsewidth determining voltage from a capacitance-resistance network. Switch means, which functions to initiate and terminate output pulses, is activated by an external signal to initiate pulses and by the output of the differential amplifier to terminate pulses.
Inventors
- 👤 Antonio F Bellomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/353; H03K3/26; H03K3/28; H03K3/281
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
A monostable multivibrator comprising, in combination, a differential amplifier, a capacitance-resistance network connected to one input of the differential amplifier, a voltage divider connected to the other input of the differential amplifier, normally closed switch means connected across the capacitance to bypass the same when the switch is in the closed condition, and normally open switch means adapted to close when the normally closed switch is opened, the normally open switch means being connected to provide an output from the monostable multivibrator.
Claim 2
Dependent Claim
82 words
A monostable multivibrator comprising, in combination, a differential amplifier, a capacitance-resistance network connected to one input of the differential amplifier, a voltage divider connected to the other input of the differential amplifier, normally closed switch means connected across the capacitance to bypass the same when the switch is in the closed condition, and normally open switch means adapted to close when the normally closed switch is opened, the normally open switch means being connected to provide an output from the monostable multivibrator.
Claim 3
Dependent Claim
53 words
Apparatus as claimed in claim 1 in which the network comprises a resistance and a capacitance serially connected and said one input is connected to the common connection therebetween, and in which the voltage divider comprises two serially connected thermally matched resistances and said other input is connected to the common connection therebetween.
Claim 4
Dependent Claim
28 words
A monostable multivibrator as claimed in claim 1 including flip-flop means which acts to control the normally closed switch means and which constitutes the normally open switch means.
Claim 5
Dependent Claim
29 words
A monostable multivibrator as claimed in claim 1, including Schmidt trigger means which acts to control the normally closed switch means and which constitutes the normally open switch means.
Claim 6
Dependent Claim
21 words
A monostable multivibrator as claimed in claim 1, in which the normally open and normally closed switch means are junction transistors.
Claim 7
Dependent Claim
16 words
A monostable multivibrator as claimed in claim 1 in which the transistors are field effect transistors.
Claim 8
Dependent Claim
18 words
A monostable multivibrator as claimed in claim 6 in which the transistors are metal oxide field effect transistors.
Claim 9
Dependent Claim
135 words
A monolithic integrated circuit monostable multivibrator comprising, in combination, a differential amplifier, a voltage divider connected to the one input of the differential amplifier, the voltage divider comprising thermally matched serially connected resistances, normally closed switch means, normally open switch means adapted to close when the normally closed switch is opened and connected to provide an output from the monostable multivibrator, a flip-flop to control the normally closed switch means, the foregoing elements of the multivibrator being in the form of a monolithic integrated circuit to provide close thermal coupling between said elements; and a time-determining component comprising an external serially connected resistance-capacitance network connected to the other input of the differential amplifier, the normally closed switch means being connected across the capacitance to bypass the same when the switch is in the closed condition.
Claim 10
Dependent Claim
135 words
A monolithic integrated circuit monostable multivibrator comprising, in combination, a differential amplifier, a voltage divider connected to the one input of the differential amplifier, the voltage divider comprising thermally matched serially connected resistances, normally closed switch means, normally open switch means adapted to close when the normally closed switch is opened and connected to provide an output from the monostable multivibrator, a flip-flop to control the normally closed switch means, the foregoing elements of the multivibrator being in the form of a monolithic integrated circuit to provide close thermal coupling between said elements; and a time-determining component comprising an external serially connected resistance-capacitance network connected to the other input of the differential amplifier, the normally closed switch means being connected across the capacitance to bypass the same when the switch is in the closed condition.
Claim 11
Dependent Claim
97 words
A monostable multivibrator comprising, in combination, a differential amplifier, a capacitance-resistance network connected to one input of the differential amplifier, a voltage divider connected to the other input of the differential amplifier, and switch means connected to short circuit the capacitance of said network in one switch position and to remove the short circuit in the other switch position, the switch means being connected to provide an output from the monostable multivibrator during the period that the short circuit is removed, the network and the voltage divider being adapted to connect in parallel across a voltage source.
Claim 12
Dependent Claim
97 words
A monostable multivibrator comprising, in combination, a differential amplifier, a capacitance-resistance network connected to one input of the differential amplifier, a voltage divider connected to the other input of the differential amplifier, and switch means connected to short circuit the capacitance of said network in one switch position and to remove the short circuit in the other switch position, the switch means being connected to provide an output from the monostable multivibrator during the period that the short circuit is removed, the network and the voltage divider being adapted to connect in parallel across a voltage source.
Claim 13
Dependent Claim
21 words
Apparatus having two monostable multivibrators as claimed in claim 9 in closed-loop configuration to provide an astable low frequency clock generator.
References Cited (Backward Citations)
US3441872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |