US3879684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuneable UJT oscillator circuit
Assignee: INVENTRONICS Inc
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Filing: 1973-09-24
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Granted: 1975-04-22
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Expires: 1993-09-24
Abstract
Abstract A relaxation oscillator with an offset control. A timing circuit including a charge storage device in the relaxation oscillator is energized from a normally constant voltage source and one or more variable voltage sources. The first source also establishes a reference signal in a discharge circuit in the relaxation oscillator. Changes in the voltage from the variable voltage source do not affect the reference signal, but do affect a timing signal from the charge storage device. As the discharge circuit discharges the charge storage device each time the timing signal exceeds the reference voltage, changing the voltage from the variable voltage source does alter oscillator frequency.
Inventors
- 👤 Albert E Sanderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:30
CPC Classifications
G; G10; G10G; G10G7/00; G10G7/02; H; H03; H03K; H03K3/00; H03K3/02; H03K3/35; H03K3/351; Y; Y10; Y10S; Y10S84/00; Y10S84/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A variable frequency oscillator circuit comprising: A. a relaxation oscillator including i. a timing circuit including a charge storage unit and an input terminal for transmitting a timing signal, and ii. a discharge circuit connected to said timing circuit to receive the timing signal, said discharge circuit transmitting an output signal at a frequency nominally determined by the timing signal from said timing circuit, and including means for comparing the timing signal and a reference signal, B. a normally constant voltage source connected for energizing said discharge circuit to establish the reference signal, C. means connecting said normally constant voltage source to said timing circuit input terminal for providing a voltage thereto, and D. a variable voltage source connected to said timing circuit input terminal for transmitting a variable voltage thereto whereby said variable voltage source can offset the oscillator frequency from the nominal frequency determined by said timing circuit and said normally constant voltage source.
Claim 2
Dependent Claim
156 words
A variable frequency oscillator circuit comprising: A. a relaxation oscillator including i. a timing circuit including a charge storage unit and an input terminal for transmitting a timing signal, and ii. a discharge circuit connected to said timing circuit to receive the timing signal, said discharge circuit transmitting an output signal at a frequency nominally determined by the timing signal from said timing circuit, and including means for comparing the timing signal and a reference signal, B. a normally constant voltage source connected for energizing said discharge circuit to establish the reference signal, C. means connecting said normally constant voltage source to said timing circuit input terminal for providing a voltage thereto, and D. a variable voltage source connected to said timing circuit input terminal for transmitting a variable voltage thereto whereby said variable voltage source can offset the oscillator frequency from the nominal frequency determined by said timing circuit and said normally constant voltage source.
Claim 3
Dependent Claim
156 words
A variable frequency oscillator circuit comprising: A. a relaxation oscillator including i. a timing circuit including a charge storage unit and an input terminal for transmitting a timing signal, and ii. a discharge circuit connected to said timing circuit to receive the timing signal, said discharge circuit transmitting an output signal at a frequency nominally determined by the timing signal from said timing circuit, and including means for comparing the timing signal and a reference signal, B. a normally constant voltage source connected for energizing said discharge circuit to establish the reference signal, C. means connecting said normally constant voltage source to said timing circuit input terminal for providing a voltage thereto, and D. a variable voltage source connected to said timing circuit input terminal for transmitting a variable voltage thereto whereby said variable voltage source can offset the oscillator frequency from the nominal frequency determined by said timing circuit and said normally constant voltage source.
Claim 4
Dependent Claim
156 words
A variable frequency oscillator circuit comprising: A. a relaxation oscillator including i. a timing circuit including a charge storage unit and an input terminal for transmitting a timing signal, and ii. a discharge circuit connected to said timing circuit to receive the timing signal, said discharge circuit transmitting an output signal at a frequency nominally determined by the timing signal from said timing circuit, and including means for comparing the timing signal and a reference signal, B. a normally constant voltage source connected for energizing said discharge circuit to establish the reference signal, C. means connecting said normally constant voltage source to said timing circuit input terminal for providing a voltage thereto, and D. a variable voltage source connected to said timing circuit input terminal for transmitting a variable voltage thereto whereby said variable voltage source can offset the oscillator frequency from the nominal frequency determined by said timing circuit and said normally constant voltage source.
Claim 5
Dependent Claim
61 words
A variable frequency oscillator circuit as recited in claim 1 wherein said variable voltage source comprises i. a potentiometer including a resistance connected for energization by said normally constant voltage source and tap means for obtaining a portion of the normally constant voltage from said resistance means, and ii. a resistor coupling said tap means to said timing circuit input terminal.
Claim 6
Dependent Claim
98 words
A variable frequency oscillator circuit as recited in claim 2 wherein: A. said relaxation oscillator discharge circuit comparison means includes a unijunction transistor, B. said timing circuit includes a resistor connected to said input terminal and in series with said charge storage unit, the voltage across said unit constituting the timing signal, said timing circuit resistor being variable to alter the nominal frequency between discrete values, and C. said variable voltage source altering the voltage at the timing circuit input terminal to produce an offset from each of said nominal frequencies as a percentage of the nominal frequency.
Claim 7
Dependent Claim
27 words
A variable frequency oscillator circuit as recited in claim 3 wherein said connecting means between said normally constant voltage source and said discharge circuit comprises a resistor.
Claim 8
Dependent Claim
98 words
A variable frequency oscillator circuit as recited in claim 1 additionally comprising another variable voltage source connected to said timing circuit input terminal for transmitting another variable voltage thereto, each of said variable voltage sources comprising: i. a potentiometer including a resistance connected for energization by said normally constant voltage source and tap means for obtaining a portion of the normally constant voltage from said resistance means, and ii. a resistor for coupling said tap connecting means to said timing circuit input terminal, each of said potentiometers and each of said connecting resistors having different values of resistance.
Claim 9
Dependent Claim
105 words
An oscillator circuit comprising: A. a relaxation oscillator including i. a unijunction transistor, with base electrodes and an emitter electrode, ii. a timing circuit including an input terminal and a capacitor, the voltage across said capacitor being coupled to said emitter electrode, B. a normally constant voltage source connected to said base electrodes, C. a resistor connecting said normally constant voltage source to said timing circuit input terminal, D. a variable voltage source including a potentiometer connected to said normally constant voltage source to provide a variable voltage at an adjustable tap therein and a resistor coupling said tap and said timing circuit input terminal.
Claim 10
Dependent Claim
105 words
An oscillator circuit comprising: A. a relaxation oscillator including i. a unijunction transistor, with base electrodes and an emitter electrode, ii. a timing circuit including an input terminal and a capacitor, the voltage across said capacitor being coupled to said emitter electrode, B. a normally constant voltage source connected to said base electrodes, C. a resistor connecting said normally constant voltage source to said timing circuit input terminal, D. a variable voltage source including a potentiometer connected to said normally constant voltage source to provide a variable voltage at an adjustable tap therein and a resistor coupling said tap and said timing circuit input terminal.
References Cited (Backward Citations)
US3559098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |