Patent US4261044A successfully refreshed from Google Patents.
US4261044A
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Temperature compensated magnetic bubble memory sense amplifier
Assignee: Texas Instruments Inc
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Filing: 1979-11-05
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Granted: 1981-04-07
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Expires: 1999-11-05
Abstract
Abstract A temperature compensated, phase tolerant sense amplifier for use in a magnetic bubble memory system in which current is applied to the detector resistors only during a bubble detect operation.
Inventors
- 👤 Thomas A. Closson
- 👤 David B. Oxford
- 👤 Stephen R. Schenck
- 👤 Jerold A. Seitchik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:44
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/02; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
In combination with a magnetic bubble memory system comprising: a magnetic bubble memory device having magnetic bubbles stored therein, a detector resistor which changes resistance in response to the movement of a magnetic bubble therebeneath, and a dummy detector; and control means for moving the magnetic bubbles stored in the magnetic memory device beneath the detector resistor; an improved sense amplifier comprising: current source means for providing a flow of current at a level determined by a reference voltage, through each of the resistors to develop a voltage thereacross; amplifier means for providing an output signal proportionally greater than the voltage developed across the resistors; comparator means for providing a trigger signal in response to the amplifier output signal exceeding a predetermined threshold voltage; and temperature compensation means for providing the reference voltage at a voltage determined by the temperature of the temperature compensation means.
Claim 2
Dependent Claim
145 words
In combination with a magnetic bubble memory system comprising: a magnetic bubble memory device having magnetic bubbles stored therein, a detector resistor which changes resistance in response to the movement of a magnetic bubble therebeneath, and a dummy detector; and control means for moving the magnetic bubbles stored in the magnetic memory device beneath the detector resistor; an improved sense amplifier comprising: current source means for providing a flow of current at a level determined by a reference voltage, through each of the resistors to develop a voltage thereacross; amplifier means for providing an output signal proportionally greater than the voltage developed across the resistors; comparator means for providing a trigger signal in response to the amplifier output signal exceeding a predetermined threshold voltage; and temperature compensation means for providing the reference voltage at a voltage determined by the temperature of the temperature compensation means.
Claim 3
Dependent Claim
26 words
The amplifier of claim 1 wherein the temperature compensation means provides the threshold voltage at a voltage determined by the temperature of the temperature compensation means.
Claim 4
Dependent Claim
29 words
The amplifier of claim 2 wherein the temperature compensation means establishes the gain of the amplifier means at a level determined by the temperature of the temperature compensation means.
Claim 5
Dependent Claim
29 words
The amplifier of claim 1 wherein the temperature compensation means establishes the gain of the amplifier means at a level determined by the temperature of the temperature compensation means.
Claim 6
Dependent Claim
26 words
The amplifier of claim 1, 2, 3, or 4 wherein the temperature compensation means includes temperature sensing means responsive to the temperature of the sense amplifier.
Claim 7
Dependent Claim
28 words
The amplifier of claim 1, 2, 3, or 4 wherein the temperature compensation means includes temperature sensing means responsive to the temperature of the magnetic bubble memory device.
Claim 8
Dependent Claim
137 words
In combination with a magnetic bubble memory system comprising: a magnetic bubble memory device having magnetic bubbles stored therein, a detector resistor which changes resistance in response to the movement of a magnetic bubble therebeneath, and a dummy resistor; and control means for moving the magnetic bubbles stored in the magnetic memory device beneath the detector resistor; an improved sense amplifier comprising: current source means for providing a flow of current through each of the resistors to develop a voltage thereacross; amplifier means for providing an output signal proportionally greater than the voltage developed across the resistors; comparator means for providing a trigger signal in response to the amplifier output signal exceeding a predetermined threshold voltage; and temperature compensation means for providing the threshold voltage at a voltage determined by the temperature of the temperature compensation means.
Claim 9
Dependent Claim
137 words
In combination with a magnetic bubble memory system comprising: a magnetic bubble memory device having magnetic bubbles stored therein, a detector resistor which changes resistance in response to the movement of a magnetic bubble therebeneath, and a dummy resistor; and control means for moving the magnetic bubbles stored in the magnetic memory device beneath the detector resistor; an improved sense amplifier comprising: current source means for providing a flow of current through each of the resistors to develop a voltage thereacross; amplifier means for providing an output signal proportionally greater than the voltage developed across the resistors; comparator means for providing a trigger signal in response to the amplifier output signal exceeding a predetermined threshold voltage; and temperature compensation means for providing the threshold voltage at a voltage determined by the temperature of the temperature compensation means.
Claim 10
Dependent Claim
29 words
The amplifier of claim 7 wherein the temperature compensation means establishes the gain of the amplifier means at a level determined by the temperature of the temperature compensation means.
Claim 11
Dependent Claim
24 words
The amplifier of claim 7 or 8 wherein the temperature compensation means includes temperature sensing means responsive to the temperature of the sense amplifier.
Claim 12
Dependent Claim
26 words
The amplifier of claim 7 or 8 wherein the temperature compensation means includes temperature sensing means responsive to the temperature of the magnetic bubble memory device.
Claim 13
Dependent Claim
140 words
In combination with a magnetic bubble memory system comprising: a magnetic bubble memory device having magnetic bubbles stored therein, a detector resistor which changes resistance in response to the movement of a magnetic bubble therebeneath, and a dummy resistor; and control means for moving the magnetic bubbles stored in the magnetic memory device beneath the detector resistor; an improved sense amplifier comprising: current source means for providing a flow of current through each of the resistors to develop a voltage thereacross; amplifier means for providing an output signal proportionally greater than the voltage developed across the resistors; comparator means for providing a trigger signal in response to the amplifier output signal exceeding a predetermined threshold voltage; and temperature compensation means for establishing the gain of the amplifier means at a level determined by the temperature of the temperature compensation means.
Claim 14
Dependent Claim
140 words
In combination with a magnetic bubble memory system comprising: a magnetic bubble memory device having magnetic bubbles stored therein, a detector resistor which changes resistance in response to the movement of a magnetic bubble therebeneath, and a dummy resistor; and control means for moving the magnetic bubbles stored in the magnetic memory device beneath the detector resistor; an improved sense amplifier comprising: current source means for providing a flow of current through each of the resistors to develop a voltage thereacross; amplifier means for providing an output signal proportionally greater than the voltage developed across the resistors; comparator means for providing a trigger signal in response to the amplifier output signal exceeding a predetermined threshold voltage; and temperature compensation means for establishing the gain of the amplifier means at a level determined by the temperature of the temperature compensation means.
References Cited (Backward Citations)
US4159537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |