US3811097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A variable frequency astable multivibrator
Assignee: US Philips Corp
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Filing: 1972-11-10
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Granted: 1974-05-14
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Expires: 1992-11-10
Abstract
Abstract Emitter-coupled astable multivibrator in which the charging and discharging currents for the coupling capacitor are supplied by a current source circuit the two outputs of which are connected each to a terminal of the capacitor. This current source circuit comprises a differential stage and a four-quadrant multiplier.
Inventors
- 👤 E Dijkmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:40
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2821
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A variable frequency astable multivibrator comprising two amplifying elements each having a control electrode, an output electrode and a supply electrode, a coupling network for coupling the control electrode of one amplifying element to the output electrOde of the other amplifying element, said network including a capacitive element connected between the supply electrodes, a first circuit including a differential stage having a common input terminal connected in series with a current source, two first output terminals and means for controlling the amount of current flowing therethrough, and a second circuit including two bistable gating stages having input terminals connected to said first output terminals, second output terminals connected to the supply electrodes of said amplifying elements, respectively, and control means coupled to at least one amplifying element to alternate the states of said bistable gating stages in accordance with the alternation of stages of said amplifying elements, thereby providing substantially equal charging and, respectively, discharging currents paths for said capacitive element.
Claim 2
Dependent Claim
161 words
A variable frequency astable multivibrator comprising two amplifying elements each having a control electrode, an output electrode and a supply electrode, a coupling network for coupling the control electrode of one amplifying element to the output electrOde of the other amplifying element, said network including a capacitive element connected between the supply electrodes, a first circuit including a differential stage having a common input terminal connected in series with a current source, two first output terminals and means for controlling the amount of current flowing therethrough, and a second circuit including two bistable gating stages having input terminals connected to said first output terminals, second output terminals connected to the supply electrodes of said amplifying elements, respectively, and control means coupled to at least one amplifying element to alternate the states of said bistable gating stages in accordance with the alternation of stages of said amplifying elements, thereby providing substantially equal charging and, respectively, discharging currents paths for said capacitive element.
Claim 3
Dependent Claim
39 words
An astable multivibrator as claimed in claim 1, wherein said amplifying elements are switching transistors each having a base corresponding to said control electrode, a collector corresponding to said output electrode and an emitter corresponding to said supply electrode.
Claim 4
Dependent Claim
132 words
An astable multivibrator as claimed in claim 2, wherein said first circuit includes a source of a variable control signal, a pair of transistors having emitters connected to said common input terminals, collectors connected to said first output terminals, respectively, and bases connected to said source of the variable control signals, said second differentiating circuit including two pairs of transistors, each pair having emitters connected to an assigned output terminal of said first circuit, the base of each transistor in one pair being connected to the base of a corresponding transistor in the other pair, the collector of one transistor in each pair being coupled to the emitter of one switching transistor and the collector of the other transistor in each pair being coupled to the emitter of the other switching transistor.
Claim 5
Dependent Claim
31 words
An astable multivibrator as claimed in claim 3, further comprising semiconductor junction means for coupling the base of one switching transistor to a connected pair of bases in said second circuit.
Claim 6
Dependent Claim
33 words
An astable multivibrator as claimed in claim 3, further comprising a pair of separating transistors each being coupled between the emitter of one switching transistor and the connected collectors in said second circuit.
References Cited (Backward Citations)
US3061799A
Cited
US3077567A
Cited
US3167726A
Cited
US3204200A
Cited
US3445788A
Cited
US3382457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |