US3757142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined threshold detector and multivibrator circuit
Assignee: Fiat SpA
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Filing: 1972-01-11
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Granted: 1973-09-04
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Expires: 1992-01-11
Abstract
Abstract A circuit which acts simultaneously as a threshold circuit and a monostable multivibrator is disclosed. The circuit, in its preferred form comprises three transistors two of which form the multivibrator and the third of which performs a control switching operation to determine the threshold function. The circuit operates from a single voltage source. When in operation one of the transistors of the multivibrator part of the circuit is biased to saturated conducting state and the other is biased to a non-conducting state, the threshold transistor is biased to a saturated conducting state and connected to the non-conducting transistor such that when a signal is applied to its base its conducting or non-conducting state determines the switching of the multivibrator.
Inventors
- 👤 M Palazzetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:31
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/284; H03K3/286; H03K3/2893
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
An electronic circuit comprising a. multivibrator means including a first transistor, means biasing said first transistor to a non-conducting State, a second transistor, means biasing said second transistor to a saturated conducting state, and means interconnecting said first and second transistors, b. threshold circuit means including a third transistor, means biasing said third transistor to a saturated conducting state, wherein a negative input signal to the base of the third transistor switches the third transistor to a nonconducting state; and a signal input terminal, said base of said third transistor being coupled to said signal input terminal c. capacitive means coupling the base of said first transistor to the collector of said third transistor, d. resistive means coupling the base of said third transistor to the collector of said first transistor, and e. circuit means coupling the collector of said first transistor to the base of said second transistor said circuit means including a first diode and a condenser connected in series wherein said first diode provides temperature compensation for said first transistor.
Claim 2
Dependent Claim
173 words
An electronic circuit comprising a. multivibrator means including a first transistor, means biasing said first transistor to a non-conducting State, a second transistor, means biasing said second transistor to a saturated conducting state, and means interconnecting said first and second transistors, b. threshold circuit means including a third transistor, means biasing said third transistor to a saturated conducting state, wherein a negative input signal to the base of the third transistor switches the third transistor to a nonconducting state; and a signal input terminal, said base of said third transistor being coupled to said signal input terminal c. capacitive means coupling the base of said first transistor to the collector of said third transistor, d. resistive means coupling the base of said third transistor to the collector of said first transistor, and e. circuit means coupling the collector of said first transistor to the base of said second transistor said circuit means including a first diode and a condenser connected in series wherein said first diode provides temperature compensation for said first transistor.
Claim 3
Dependent Claim
33 words
The electronic circuit of claim 1, further including temperature compensation means including a second diode coupled to said signal input terminal, said temperature compensation means compensating for thermal drift of said third transistor.
Claim 4
Dependent Claim
39 words
The electronic circuit of claim 1 wherein the collector of said first transistor, the collector and base of said second transistor, and the collector of said third transistor, are all coupled by respective resistors to said biasing voltage source.
Claim 5
Dependent Claim
23 words
The electronic circuit of claim 1 wherein the collector of said second transistor is connected to the input of a low pass filter.
Claim 6
Dependent Claim
19 words
The electronic circuit of claim 4 wherein said low pass filter comprises a series resistor and a grounded condenser.
Claim 7
Dependent Claim
39 words
The electronic circuit of claim 5 wherein the junction between said series resistor and said grounded condenser of said low pass filter is coupled to the collector of said first transistor by a condenser and a resistor in series.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |