US3969619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog servo memory
Assignee: Combustion Engineering Inc
•
Filing: 1975-02-13
•
Granted: 1976-07-13
•
Expires: 1995-02-13
Abstract
Abstract A solid-state servo memory characterized by a maximum value selection circuit which provides, to an analog integrator, a signal commensurate with the magnitude of the one of a plurality of inputs having the instantaneously highest value. The memory is capable of operation in a manual or automatic mode and, in the automatic mode, the integrator is isolated from the memory output terminal but is continually reset to the output level of the selection circuit. In the manual mode the output of the integrator is coupled to the memory output terminal and may be driven in either direction.
Inventors
- 👤 Mohamed A. R. El-Ramly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:31
CPC Classifications
G; G11; G11C; G11C27/00; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186; G06G7/1865
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
261 words
An analog servo memory, said memory having an output terminal and receiving a plurality of input signals in the form of variable direct current potentials, said memory comprising: maximum value selector circuit means, said maximum value selector circuit means receiving said plurality of said input signals and providing an output signal commensurate with the magnitude of the input signal having the instantaneously highest magnitude; an analog integrator, said integrator having an input and an output; automatic-manual mode selector switch means; means coupling a first contact of said selector switch means to the memory output terminal; means connecting a second contact of said selector switch means to the output of said maximum value selector circuit means, said first and second contacts of said selector switch means being closed in the automatic mode position and being open in the manual mode position; means connecting a third contact of said selector switch means to the output of said integrator, said first and third contacts of said selector switch means being open in the automatic mode position and being closed in the manual mode position; means for selectively delivering the output signal provided by said maximum value selector circuit means to the input of said integrator, said selective delivering means isolating the integrator from the maximum value selector circuit means output signal when said selector switch means is in the manual mode position; and means for selectively varying the magnitude of the signal appearing at the output of said integrator independently of the value of input signals applied to said maximum value selector circuit means.
Claim 2
Dependent Claim
261 words
An analog servo memory, said memory having an output terminal and receiving a plurality of input signals in the form of variable direct current potentials, said memory comprising: maximum value selector circuit means, said maximum value selector circuit means receiving said plurality of said input signals and providing an output signal commensurate with the magnitude of the input signal having the instantaneously highest magnitude; an analog integrator, said integrator having an input and an output; automatic-manual mode selector switch means; means coupling a first contact of said selector switch means to the memory output terminal; means connecting a second contact of said selector switch means to the output of said maximum value selector circuit means, said first and second contacts of said selector switch means being closed in the automatic mode position and being open in the manual mode position; means connecting a third contact of said selector switch means to the output of said integrator, said first and third contacts of said selector switch means being open in the automatic mode position and being closed in the manual mode position; means for selectively delivering the output signal provided by said maximum value selector circuit means to the input of said integrator, said selective delivering means isolating the integrator from the maximum value selector circuit means output signal when said selector switch means is in the manual mode position; and means for selectively varying the magnitude of the signal appearing at the output of said integrator independently of the value of input signals applied to said maximum value selector circuit means.
Claim 3
Dependent Claim
58 words
The apparatus of claim 1 wherein said means for selectively varying the magnitude of the integrator output signal comprises: means for generating a positive bias signal; means for generating a negative bias signal; and means for selectively applying one of said bias signals to the integrator input when said selector switch means is in the manual mode position.
Claim 4
Dependent Claim
26 words
The apparatus of claim 2 wherein said means connecting the first contact of said selector switch means to the memory output terminal comprises: impedance matching means.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 wherein said means connecting the first contact of said selector switch means to the memory output terminal comprises: impedance matching means.
Claim 6
Dependent Claim
79 words
The apparatus of claim 1 wherein said maximum value selector circuit means comprises: a plurality of summing circuit means, each of said summing circuit means receiving one of said input signals; and a plurality of voltage responsive solid-state switch means, said switch means having a common output terminal connected to said means coupling the output signal provided by the maximum value selection circuit to said integrator, said switch means being respectively connected to individual of said summing circuit means.
Claim 7
Dependent Claim
100 words
The apparatus of claim 1 wherein said maximum value selector circuit means comprises: a plurality of transistor switches, said transistor switches having their collector electrodes connected to a common voltage source, said transistor switches having a common emitter circuit connected to said means selectively coupling the output signal provided by said maximum value selector circuit means to said integrator; and means coupling input signals of said plurality respectively to base electrodes of respective of said transistor switches whereby the transistor switch with the highest base voltage will be rendered conductive and the remainder of said transistor switches will be disabled.
Claim 8
Dependent Claim
25 words
The apparatus of claim 6 wherein said means coupling the input signals to the base electrodes of said transistor switches each comprises: a summing amplifier.
References Cited (Backward Citations)
US3655992A
Cited
US3694633A
Cited
US3662276A
Cited
US3740652A
Cited
US3772602A
Cited
US3858199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |