Patent US3633004A successfully refreshed from Google Patents.
US3633004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrator/synchronizer with infinite memory including drift-correcting feedback circuit
Assignee: Bendix Corp
•
Filing: 1969-09-24
•
Granted: 1972-01-04
•
Expires: 1989-09-24
Abstract
Abstract Apparatus including an analog integrator and means for operating the analog integrator in closed-loop configuration as a synchronizer. Circuits are provided for imparting infinite memory to the device and for minimizing output drift.
Inventors
- 👤 Robert L James
- 👤 David A Tawfik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:53
CPC Classifications
G; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/026; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
An electrical system, comprising: means for providing an input signal; an analog integrator connected to the input signal means for integrating the signal therefrom; means for converting the integrator output to a digital output for imparting memory thereto, and for converting the digital output to an analog output; comparator means connected to the analog integrator and to the converting means for comparing the integrator signal and the analog output, and for providing a signal corresponding to the difference therebetween for driving the cOnverter; the converting means being arranged so that the output therefrom lags the integrator output until the input signal is zero, and at which time the converting means output catches up with the integrator output and the difference signal is reduced to a level near zero within a threshold of the converting means, and the converting means output being a fixed reference held constant through the memory within the converting means as long as the difference signal is within the threshold.
Claim 2
Dependent Claim
163 words
An electrical system, comprising: means for providing an input signal; an analog integrator connected to the input signal means for integrating the signal therefrom; means for converting the integrator output to a digital output for imparting memory thereto, and for converting the digital output to an analog output; comparator means connected to the analog integrator and to the converting means for comparing the integrator signal and the analog output, and for providing a signal corresponding to the difference therebetween for driving the cOnverter; the converting means being arranged so that the output therefrom lags the integrator output until the input signal is zero, and at which time the converting means output catches up with the integrator output and the difference signal is reduced to a level near zero within a threshold of the converting means, and the converting means output being a fixed reference held constant through the memory within the converting means as long as the difference signal is within the threshold.
Claim 3
Dependent Claim
74 words
An electrical system as described by claim 1 including: means connected to the input signal means and to the analog integrator for summing the signals therefrom; normally closed switching means for connecting the summing means to the integrator so that the integrator signal washes out the input signal, and means for opening the switching means at a predetermined synchronizing instant so that the summing means provides a signal time related to the synchronizing instant.
Claim 4
Dependent Claim
37 words
An electrical system as described by claim 1, including: means connected to the comparator and to the integrator for applying the difference signal from the comparator as negative feedback to the integrator to correct for integrator drift.
Claim 5
Dependent Claim
35 words
An electrical system as described by claim 3, wherein said means includes: an amplifier having negligible threshold and infinite gain, and having an input connected to the comparator and an output connected to the integrator.
Claim 6
Dependent Claim
33 words
An electrical system as described by claim 4, wherein: the integrator includes an operational amplifier having a capacitor connected in feedback relation; and the operational amplifier has its output connected to the comparator.
Claim 7
Dependent Claim
50 words
An electrical system as described by claim 2 including: an amplifier having negligible threshold and infinite gain and having an input connected to the comparator and an output connected intermediate the switch and the integrator, and providing a signal in response to the comparator output to correct for integrator drift.
References Cited (Backward Citations)
US3070786A
Cited
US3152249A
Cited
US3192371A
Cited
US3430227A
Cited
US3475600A
Cited
US3404857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |