US4497998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature stabilized stop-restart oscillator
Assignee: National Semiconductor Corp
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Filing: 1982-12-23
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Granted: 1985-02-05
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Expires: 2002-12-23
Abstract
Abstract A closed loop integrated circuit temperature stabilizer 10 has an on-chip temperature sensor 12 for supplying a voltage indication of temperature to an op amp 22 which maintains chip temperature equilibrium by controlling a load transistor 30 which draws current through on-chip heating means 16.
Inventors
- 👤 Burnell G. West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:43
CPC Classifications
H; H03; H03L; H03L1/00; H03L1/02; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/2033; G05D23/2034
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
A temperature stabilized oscillator comprising: an oscillator for generating a clock signal; a gate connected to the oscillator for switchably connecting the clock signal from the oscillator to at least one output terminal, the gate being fabricated in an integrated circuit; at least one additional gate for heating the integrated circuit connected between the oscillator and a first node, each of the at least one additional gate being also fabricated in the integrated circuit; a temperature sensor disposed in the integrated circuit for producing signals varying in response to variations in temperature of the integrated circuit; and a control circuit coupled to the temperature sensor, the first node, and a source of electrical potential, for controlling operation of each of the at least one additional gate in response to the signals from the temperature sensor.
Claim 2
Dependent Claim
135 words
A temperature stabilized oscillator comprising: an oscillator for generating a clock signal; a gate connected to the oscillator for switchably connecting the clock signal from the oscillator to at least one output terminal, the gate being fabricated in an integrated circuit; at least one additional gate for heating the integrated circuit connected between the oscillator and a first node, each of the at least one additional gate being also fabricated in the integrated circuit; a temperature sensor disposed in the integrated circuit for producing signals varying in response to variations in temperature of the integrated circuit; and a control circuit coupled to the temperature sensor, the first node, and a source of electrical potential, for controlling operation of each of the at least one additional gate in response to the signals from the temperature sensor.
Claim 3
Dependent Claim
35 words
Apparatus in claim 1 wherein the temperature sensor comprises: a ground terminal; and a bipolar transistor having a base and a collector coupled to the ground terminal and a emitter connected to a second node.
Claim 4
Dependent Claim
85 words
Apparatus as in claim 2 wherein the control circuit comprises: a reference voltage supply; an operational amplifier having a positive input terminal connected to the voltage supply and a negative input terminal connected to the second node; a capacitor connected between the second node and an output terminal of the operational amplifier; and a bipolar transistor having a base connected to the output terminal of the operational amplifier, a collector connected to the first node, and an emitter connected to the source of electrical potential.
Claim 5
Dependent Claim
12 words
Apparatus as in claim 3 wherein the oscillator comprises a ring oscillator.
References Cited (Backward Citations)
US3320407A
Cited
US3308271A
Cited
US3395265A
Cited
US3393870A
Cited
US3431392A
Cited
US3719797A
Cited
US3818254A
Cited
US3887785A
Cited
US4157466A
Cited
US4317985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |