US4134030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hall-effect integrated circuit switch
Assignee: Motorola Solutions Inc
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Filing: 1978-04-24
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Granted: 1979-01-09
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Expires: 1998-04-24
Abstract
Abstract An integrated circuit in which the Hall-Effect device and the sensing circuit can be incorporated on a single monolithic chip includes a Hall-Effect generator responsive to a magnetic flux change for generating a Hall-Effect voltage. A differential amplifier and current mirror circuit are coupled to the Hall-Effect device in order to vary or track the threshold voltage of the differential amplifier circuit in accordance with the output voltage from the Hall-Effect device irrespective of current changes in the Hall-Effect device due to temperature variations.
Inventors
- 👤 Wilson D. Pace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:21
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/06; F02P7/067; F02P7/07; H; H10; H10B; H10B61/00; H10N; H10N59/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A Hall-Effect integrated circuit comprising: (a) a Hall-Effect semiconductor device being responsive to a magnetic flux for providing a Hall-Effect output signal in response to the magnetic flux and having a Hall-Effect current flowing therethrough sensitive to temperature variations, (b) sensing means having a threshold voltage and an operating current coupled to said Hall-Effect device for generating an output voltage at a time when said output signal reaches said threshold voltage, and (c) means coupled to said Hall-Effect device and to said sensing means for maintaining said operating current at a value which has predetermined relationship to said Hall-Effect current during temperature variations for causing said Hall-Effect output signal to track with said threshold voltage for generating a sensing output signal substantially independent of temperature variations.
Claim 2
Dependent Claim
126 words
A Hall-Effect integrated circuit comprising: (a) a Hall-Effect semiconductor device being responsive to a magnetic flux for providing a Hall-Effect output signal in response to the magnetic flux and having a Hall-Effect current flowing therethrough sensitive to temperature variations, (b) sensing means having a threshold voltage and an operating current coupled to said Hall-Effect device for generating an output voltage at a time when said output signal reaches said threshold voltage, and (c) means coupled to said Hall-Effect device and to said sensing means for maintaining said operating current at a value which has predetermined relationship to said Hall-Effect current during temperature variations for causing said Hall-Effect output signal to track with said threshold voltage for generating a sensing output signal substantially independent of temperature variations.
Claim 3
Dependent Claim
79 words
A Hall-Effect circuit as recited in claim 1 wherein: (a) said means coupled to said Hall-Effect device and to said sensing means is operatively coupled to said Hall-Effect device and is responsive to said Hall-Effect current for maintaining said operating current at a value which has a predetermined relationship to said Hall-Effect current during temperature variations for causing said Hall-Effect output signal to track with said threshold voltage for generating a sensing output signal substantially independent of temperature variations.
Claim 4
Dependent Claim
59 words
A Hall-Effect circuit as recited in claim 2 wherein: (a) said means coupled to said Hall-Effect device and to said sensing means comprises a first terminal and a second terminal, said first terminal being coupled to said Hall-Effect device for conducting said Hall-Effect current, and said second terminal being coupled to said sensing means for providing said operating current.
Claim 5
Dependent Claim
44 words
A Hall-Effect circuit as recited in claim 3 wherein: (a) said means coupled to said Hall-Effect device and to said sensing means comprises a current mirror circuit for maintaining said operating current at a value which has a predetermined relationship to said Hall-Effect current.
Claim 6
Dependent Claim
27 words
A Hall-Effect circuit as recited in claims 3 or 4 wherein: (a) said sensing means comprises a differential amplifier circuit having a pair of differentially coupled transistors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |