US4038611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable on-and off-time relaxation oscillator
Assignee: Individual
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Filing: 1976-02-27
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Granted: 1977-07-26
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Expires: 1996-02-27
Abstract
Abstract A relaxation oscillator comprising three cascaded operational voltage comparators is described. The on-time of the inventive circuit is established in accordance with a variable input element to the first operational comparator. The off-time is established by an RC network in the input circuit of the second operational comparator. The first and second operational comparators are interconnected so that the turning on or off of the second operational comparator affects the first operational comparator to cause it to also turn on or off.
Inventors
- 👤 Douglas J. Greig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:58
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/023; H03K3/0231
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
241 words
A variable on-and off-time relaxation oscillator comprising: a plurality of dual input terminal electron control means connected in cascade for generating outputs of predetermined polarities in response to inputs; variable impedance means connected to one input terminal of a first of said electron control means; first fixed impedance means connected to the other input terminal of said first electron control means; the output terminal of said first electron control means being connected to one input terminal of a second of said electron control means, a resistance-capacitance network connected to said one input terminal of said second electron control means; second fixed impedance means connected to the other input terminal of said second electron control means; the output terminal of said second electron control means being connected to an input terminal of a third electron control means, the polarity of the output of said second electron control means being the opposite of the polarity of said first and third electron control means; third fixed impedance means connected to the other input terminal of said third electron control means; the output terminal of said second electron control means being coupled to said one input terminal of said first electron control means so that an output signal on the output terminal of said second electron control means causes said first and third electron control means to be turned off and said resistance-capacitance network controls the off-time of said variable on-and off time relaxation oscillator.
Claim 2
Dependent Claim
241 words
A variable on-and off-time relaxation oscillator comprising: a plurality of dual input terminal electron control means connected in cascade for generating outputs of predetermined polarities in response to inputs; variable impedance means connected to one input terminal of a first of said electron control means; first fixed impedance means connected to the other input terminal of said first electron control means; the output terminal of said first electron control means being connected to one input terminal of a second of said electron control means, a resistance-capacitance network connected to said one input terminal of said second electron control means; second fixed impedance means connected to the other input terminal of said second electron control means; the output terminal of said second electron control means being connected to an input terminal of a third electron control means, the polarity of the output of said second electron control means being the opposite of the polarity of said first and third electron control means; third fixed impedance means connected to the other input terminal of said third electron control means; the output terminal of said second electron control means being coupled to said one input terminal of said first electron control means so that an output signal on the output terminal of said second electron control means causes said first and third electron control means to be turned off and said resistance-capacitance network controls the off-time of said variable on-and off time relaxation oscillator.
Claim 3
Dependent Claim
14 words
The oscillator of claim 1 wherein said electron control means are operational voltage comparators.
Claim 4
Dependent Claim
24 words
The circuit of claim 1 wherein said resistance-capacitance network includes a capacitor in parallel with a serial combination of a potentiometer and a resistance.
Claim 5
Dependent Claim
25 words
The circuit of claim 2 wherein said resistance-capacitance network includes a capacitor in a parallel with a serial combination of a potentiometer and a resistance.
Claim 6
Dependent Claim
157 words
A variable on-and off-time relaxation oscillator comprising three cascaded operational amplifiers having alternately poled outputs: a first input terminal of a second of said operational amplifier being coupled to the output terminal of a first of said operational amplifiers, the output terminal of said second operational amplifier being coupled to a first input of said first operational amplifier, means biassing the second inputs of said first and second operational amplifiers so that said first operational amplifier is turned off when said second amplifier is turned on; one input terminal of said third operational amplifier being coupled to the output terminal of said second operational amplifier and the other input terminal of said third operational amplifier being biassed so that said third operational amplifier is off when said second operational amplifier is on; and means for varying the on-time of said first and second operational amplifiers to thereby vary the on-time and off-time of said third operational amplifier.
Claim 7
Dependent Claim
157 words
A variable on-and off-time relaxation oscillator comprising three cascaded operational amplifiers having alternately poled outputs: a first input terminal of a second of said operational amplifier being coupled to the output terminal of a first of said operational amplifiers, the output terminal of said second operational amplifier being coupled to a first input of said first operational amplifier, means biassing the second inputs of said first and second operational amplifiers so that said first operational amplifier is turned off when said second amplifier is turned on; one input terminal of said third operational amplifier being coupled to the output terminal of said second operational amplifier and the other input terminal of said third operational amplifier being biassed so that said third operational amplifier is off when said second operational amplifier is on; and means for varying the on-time of said first and second operational amplifiers to thereby vary the on-time and off-time of said third operational amplifier.
Claim 8
Dependent Claim
14 words
The oscillator of claim 5 wherein said means for varying is a resistance-capacitance network.
Claim 9
Dependent Claim
24 words
The oscillator of claim 6 wherein said resistance-capacitance network includes a capacitor in paralled with a serial connection of a potentiometer and a resistor.
References Cited (Backward Citations)
US3763322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |