Patent US3916343A successfully refreshed from Google Patents.
US3916343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency stabilized relaxation oscillator
Assignee: Minolta Co Ltd
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Filing: 1974-07-31
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Granted: 1975-10-28
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Expires: 1994-07-31
Abstract
Abstract An improved relaxation oscillator circuit comprises a switching device such as a programmable unijunction transistor and a timeconstant circuit. A voltage dividing network consisting of two or more resistors and a diode connected together in series is employed to apply a constant bias voltage to the gate of the transistor or to the control electrode of the switching device. The diode inserted in the voltage dividing network serves to compensate for a voltage change of the source and to apply a constant bias voltage to the gate, hence to maintain the oscillation frequency constant, even for very low source voltage.
Inventors
- 👤 Takeshi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:55
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/01; H03K3/011; H03K3/02; H03K3/35; H03K3/352; H03K3/3525; H03L; H03L1/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
In a relaxation oscillator comprising: a switching device: a time-constant circuit connected to said switching device for applying a time-dependent voltage thereto; and a bias circuit, coupled to said switching device, for applying a bias voltage thereto; the improvement wherein said bias circuit comprises a plurality of voltage dividing resistors and a forward directed diode connected together in series, said switching device is a programmable unijunction transistor, said time-constant circuit comprises a resistor and a capacitor, connected together in series across both terminals of a power source, a first junction point therebetween being connected to the anode of the programmable unijunction transistor, said bias circuit being so constituted that a first resistor, a diode and a second resistor are connected in series together between the power source terminals; a second junction point between the diode and said second resistor is connected through a third resistor, to the gate of the programmable unijunction transistor, and a fourth resistor is connected between one of the power source terminals and the second junction point, and a P-N junction element is connected with its P-N junction between the gate of the programmable unijunction transistor and the second junction point.
Claim 2
Dependent Claim
195 words
In a relaxation oscillator comprising: a switching device: a time-constant circuit connected to said switching device for applying a time-dependent voltage thereto; and a bias circuit, coupled to said switching device, for applying a bias voltage thereto; the improvement wherein said bias circuit comprises a plurality of voltage dividing resistors and a forward directed diode connected together in series, said switching device is a programmable unijunction transistor, said time-constant circuit comprises a resistor and a capacitor, connected together in series across both terminals of a power source, a first junction point therebetween being connected to the anode of the programmable unijunction transistor, said bias circuit being so constituted that a first resistor, a diode and a second resistor are connected in series together between the power source terminals; a second junction point between the diode and said second resistor is connected through a third resistor, to the gate of the programmable unijunction transistor, and a fourth resistor is connected between one of the power source terminals and the second junction point, and a P-N junction element is connected with its P-N junction between the gate of the programmable unijunction transistor and the second junction point.
Claim 3
Dependent Claim
47 words
The improvement according to claim 1, wherein the P-N junction element is a bi-polar transistor connected with its collector through a fifth resistor to the power source, with its emitter to the gate of the programmable unijunction transistor and with its base to the second junction point.
Claim 4
Dependent Claim
22 words
The improvement according to claim 2, wherein the base of the transistor is connected to the second junction point through said diode.
Claim 5
Dependent Claim
24 words
The improvement according to claim 1, wherein the cathode of the programmable unijunction transistor is connected to the other of the power source terminals.
Claim 6
Dependent Claim
242 words
In a relaxation oscillator comprising: a switching device, which has a first electrode, a second electrode, and a third electrode and once the potential at the first electrode is higher than the potential of the second electrode by a specified voltage, the path from the first electrode to third electrode and the path from the second electrode to the third electrode become conductive; a time-constant circuit connected to said switching device for applying a time-dependent voltage thereto; and a bias circuit, coupled to said switching device for applying a bias voltage thereto; the improvement wherein said bias circuit comprises a plurality of voltage dividing resisTors and a forward directed diode connected together in series, said time-constant circuit comprises a resistor and a capacitor, connected together in series across both terminals of a power source, a first junction point therebetween being connected to the first electrode of the switching device, said bias circuit being so constituted that a first resistor, a diode and a second resistor are connected in series together between the power source terminals; a second junction point between the diode and said second resistor is connected through a third resistor, to the second electrode of the switching device, and a fourth resistor is connected between one of the power source terminals and the second junction point, and a P-N junction element is connected with its P-N junction between the second electrode of the switching device and the second junction point.
Claim 7
Dependent Claim
242 words
In a relaxation oscillator comprising: a switching device, which has a first electrode, a second electrode, and a third electrode and once the potential at the first electrode is higher than the potential of the second electrode by a specified voltage, the path from the first electrode to third electrode and the path from the second electrode to the third electrode become conductive; a time-constant circuit connected to said switching device for applying a time-dependent voltage thereto; and a bias circuit, coupled to said switching device for applying a bias voltage thereto; the improvement wherein said bias circuit comprises a plurality of voltage dividing resisTors and a forward directed diode connected together in series, said time-constant circuit comprises a resistor and a capacitor, connected together in series across both terminals of a power source, a first junction point therebetween being connected to the first electrode of the switching device, said bias circuit being so constituted that a first resistor, a diode and a second resistor are connected in series together between the power source terminals; a second junction point between the diode and said second resistor is connected through a third resistor, to the second electrode of the switching device, and a fourth resistor is connected between one of the power source terminals and the second junction point, and a P-N junction element is connected with its P-N junction between the second electrode of the switching device and the second junction point.
Claim 8
Dependent Claim
47 words
The improvement according to claim 5, wherein the P-N junction element is a bi-polar transistor connected with its collector through a fifth resistor to the power source, with its emitter to the second electrode of the switching device and with its base to the second junction point.
Claim 9
Dependent Claim
22 words
The improvement according to claim 6, wherein the base of the transistor is connected to the second junction point through said diode.
Claim 10
Dependent Claim
24 words
The improvement according to claim 5, wherein the third electrode of the switching device is connected to the other of the power source terminal.
Claim 11
Dependent Claim
40 words
The improvement according to claim 8, wherein the switching device is a programmable unijunction transistor with the first electrode being the anode, the second electrode being the gate and the third electrode being the cathode of the programmable unijunction transistor.
References Cited (Backward Citations)
US3660686A
Cited
US3794857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |