Patent US4353039A successfully refreshed from Google Patents.
US4353039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic astable multivibrator circuit
Assignee: 148074 HOLDINGS CANADA Ltd
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Filing: 1980-05-15
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Granted: 1982-10-05
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Expires: 2000-05-15
Abstract
Abstract First and second NPN transistors are direct connected in an astable multivibrator configuration. Each collector is connected to the positive terminal of a DC power source through series connected diodes. A resistor, which is selected to control the amplitude of oscillation, is connected between the collectors. The frequency of oscillation is controlled by a frequency determining component which is connected between the emitters of said transistors. The emitters are connected to current sources.
Inventors
- 👤 Christopher R. Huntley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:45
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2821; H03K3/283
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
295 words
An oscillator in which the loop gain is well controlled comprising: a source of direct current power having a positive and a ground terminal; first and second transistors having base, emitter and collector electrodes, the base of the first transistor being directly connected to the collector of the second transistor, and the base of the second transistor being directly connected to the collector of the first transistor; a current source having first and second input terminals arranged for connection to the emitters of said first and second transistors, respectively, and having a third terminal connected to said ground terminal; a frequency determining component having a pair of terminals the first one of the pair being connected to the emitter of said first transistor and the other terminal of the pair being connected to the emitter of said second transistor; and a collector load impedance comprising a first pair of diodes, the first diode of the pair having its anode connected to said positive terminal, and the second diode having its anode connected to the cathode of said first diode and its cathode connected to the collector of said first transistor; a second pair of diodes, the first diode of the second pair having its anode connected to said positive terminal, and the second diode of the second pair having its anode connected to the cathode of said first diode of said second pair and its cathode connected to the collector of said second transistor; and a resistor having one end thereof connected to the collector of said first transistor and the other end connected to the collector of said second transistor, said resistor performing the function of limiting the amplitude of oscillation and the value of said resistor being selected to obtain the desired amplitude.
Claim 2
Dependent Claim
295 words
An oscillator in which the loop gain is well controlled comprising: a source of direct current power having a positive and a ground terminal; first and second transistors having base, emitter and collector electrodes, the base of the first transistor being directly connected to the collector of the second transistor, and the base of the second transistor being directly connected to the collector of the first transistor; a current source having first and second input terminals arranged for connection to the emitters of said first and second transistors, respectively, and having a third terminal connected to said ground terminal; a frequency determining component having a pair of terminals the first one of the pair being connected to the emitter of said first transistor and the other terminal of the pair being connected to the emitter of said second transistor; and a collector load impedance comprising a first pair of diodes, the first diode of the pair having its anode connected to said positive terminal, and the second diode having its anode connected to the cathode of said first diode and its cathode connected to the collector of said first transistor; a second pair of diodes, the first diode of the second pair having its anode connected to said positive terminal, and the second diode of the second pair having its anode connected to the cathode of said first diode of said second pair and its cathode connected to the collector of said second transistor; and a resistor having one end thereof connected to the collector of said first transistor and the other end connected to the collector of said second transistor, said resistor performing the function of limiting the amplitude of oscillation and the value of said resistor being selected to obtain the desired amplitude.
Claim 3
Dependent Claim
15 words
An oscillator as in claim 1 wherein said frequency determining component is a piezoelectric crystal.
Claim 4
Dependent Claim
16 words
An oscillator as in claim 1 wherein said frequency determining component comprises an LC resonant circuit
Claim 5
Dependent Claim
19 words
An oscillator as in claim 2 or 3 wherein said first and second transistors are of the NPN type.
Claim 6
Dependent Claim
25 words
An oscillator as in claim 4 wherein the collector load impedance and the first and second transistors are all formed on a bipolar monolithic circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |