Patent US4716315A successfully refreshed from Google Patents.
US4716315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensation apparatus for an electrical circuit
Assignee: RCA Licensing Corp
•
Filing: 1986-10-29
•
Granted: 1987-12-29
•
Expires: 2006-10-29
Abstract
Abstract Apparatus for compensating a temperature dependent operating characteristic of a semiconductor device includes a compensation circuit which exhibits an electrical time constant closely approximating a thermal time constant of the semiconductor device. A control voltage exhibiting the electrical time constant is applied to the semiconductor device with a sense for substantially negating temperature dependent deviations of the operating characteristic of the semiconductor device.
Inventors
- 👤 Isaac M. Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:29
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
Apparatus for compensating a temperature dependent characteristic of a semiconductor device having a thermal time constant, said apparatus including: a source of operating potential coupled to said semiconductor device; a compensation circuit coupled to said source of operating potential and exhibiting an electrical time constant approximating said thermal time constant of said semiconductor device; means for deriving from said compensation circuit a control signal exhibiting said electrical time constant; and means for coupling said control signal to said semiconductor device to alter said characteristic of said semiconductor device in a direction opposite to a direction produced by temperature variations.
Claim 2
Dependent Claim
99 words
Apparatus for compensating a temperature dependent characteristic of a semiconductor device having a thermal time constant, said apparatus including: a source of operating potential coupled to said semiconductor device; a compensation circuit coupled to said source of operating potential and exhibiting an electrical time constant approximating said thermal time constant of said semiconductor device; means for deriving from said compensation circuit a control signal exhibiting said electrical time constant; and means for coupling said control signal to said semiconductor device to alter said characteristic of said semiconductor device in a direction opposite to a direction produced by temperature variations.
Claim 3
Dependent Claim
60 words
Apparatus according to claim 1 in a signal processing system, wherein said source of operating potential develops operating potentials for said semiconductor device and for said compensation circuit when said system is energized; and a decoupling circuit decouples said control signal from said semiconductor device within a predetermined time, determined by said electrical time constant, after said system is energized.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1, wherein said compensation circuit includes: a resistance coupled to an operating potential; and a capacitance for receiving current conducted by said resistance.
Claim 5
Dependent Claim
38 words
Apparatus according to claim 3, wherein: said deriving means derives said control signal from a voltage developed across said capacitance; and said deriving means includes a threshold conduction device for conveying said control signal to said semiconductor device.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 4, wherein: said control signal is coupled to said semiconductor device via a resistor.
Claim 7
Dependent Claim
46 words
Apparatus according to claim 4, wherein said deriving means includes: a transistor with an input first electrode coupled to said capacitance, and second and third electrodes defining a main current conduction path of said transistor, said main current conduction path being coupled to said semiconductor device.
Claim 8
Dependent Claim
14 words
Apparatus according to claim 6, wherein: said main current conduction path includes a resistor.
Claim 9
Dependent Claim
28 words
Apparatus according to claim 1, wherein: said semiconductor device is an integrated circuit; and said compensation circuit and said deriving means are located external to said integrated circuit.
Claim 10
Dependent Claim
35 words
Apparatus according to claim 1, wherein: said control signal is coupled to an input of said semiconductor device; and a thermistor responsive to ambient temperature changes is coupled to said input of said semiconductor device.
Claim 11
Dependent Claim
61 words
Apparatus according to claim 4 in a signal processing system, wherein: said source of operating potential develops operating potentials for said semiconductor device and for said compensation circuit when said system is energized; and said threshold conduction device decouples said control signal from said semiconductor device within a predetermined time, determined by said electrical time constant, after said system is energized.
Claim 12
Dependent Claim
103 words
Apparatus according to claim 1, wherein: said semiconductor device is a signal processing device having a temperature dependent signal gain characteristic and a gain control input for receiving a gain control voltage via a control path; said control signal is coupled to said control path for altering said gain control voltage received by said gain control input for the duration of a given interval, determined by said electrical time constant, after said semiconductor device is initially energized, to compensate for the effects of initial self-heating of said semiconductor device; and means responsive to ambient temperature changes is coupled to said gain control input.
References Cited (Backward Citations)
US3510579A
Cited
US3644757A
Cited
US3651379A
Cited
US4015149A
Cited
US3973147A
Cited
US4101841A
Cited
US4065721A
Cited
US4228338A
Cited
US4367408A
Cited
US4260956A
Cited
US4401898A
Cited
US4494145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |