US3860877A
Expired / Lapsed
US
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Constant slew rate filtering
Assignee: RTX Corp
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Filing: 1974-01-31
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Granted: 1975-01-14
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Expires: 1994-01-31
Abstract
Abstract A pair of active rate limiting filters which limit the rate of change of the output thereof with respect to the input thereto include means to compare the output with the input and to increase the slew rate significantly when the output differs by more than the predetermined amount from the input. Additionally, the slew rate can be increased in response to an external control signal.
Inventors
- 👤 John E Games
- 👤 Jr Clarence Casper
- 👤 Lertram F Kupersmith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:14
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
A constant slew rate filter means comprising: a pair of active rate limiting filters, each including an amplifier, each normally operable to provide a preselected limit on the rate of change of an output signal with respect to an input signal, each including selectively operable means to increase substantially the rate at which the output signal may change with respect to the input signal; means responsive to the output signal and the input signal of each of said amplifiers for comparing the difference between the input and output of each amplifier with a predetermined limit and for generating an excess signal in response to said difference being greater than said predetermined limit; and timing means responsive to said excess signal for generating a signal for operating said selectively operable means in each of said active filters for a predetermined time interval following the occurrence of said excess signal.
Claim 2
Dependent Claim
148 words
A constant slew rate filter means comprising: a pair of active rate limiting filters, each including an amplifier, each normally operable to provide a preselected limit on the rate of change of an output signal with respect to an input signal, each including selectively operable means to increase substantially the rate at which the output signal may change with respect to the input signal; means responsive to the output signal and the input signal of each of said amplifiers for comparing the difference between the input and output of each amplifier with a predetermined limit and for generating an excess signal in response to said difference being greater than said predetermined limit; and timing means responsive to said excess signal for generating a signal for operating said selectively operable means in each of said active filters for a predetermined time interval following the occurrence of said excess signal.
Claim 3
Dependent Claim
117 words
A constant slew rate filter means according to claim 1 wherein said timing means comprises a counter means including means operative in the absence of said excess signal to force said counter means to a reset state, and selectively operable means to provide clock signals to said counter means to advance the state of said counter means when said counter means is in other than the forced reset state, said selectively operable means being blocked by the presence of said operation signal output from said timing means, whereby said timing means maintains the presence of said operation signal once it is generated until the removal of said excess signal causes the forced resetting of said counter means.
Claim 4
Dependent Claim
39 words
A constant slew rate filter means according to claim 1 wherein said timing means further comprises means responsive to a control signal applied thereto for substantially instantaneously causing the generation of said operation signal for a predetermined time interval.
Claim 5
Dependent Claim
74 words
A constant slew rate filter means according to claim 3 wherein said timing means further comprises bistable means responsive to a control signal for removing the forced reset to said counter means and for instantaneously generating said operation signal as an alternative to the input of said counter means; and means responsive to a predetermined count of said counter means less than that which normally generates said operation signal for resetting said bistable means.
References Cited (Backward Citations)
US3628163A
Cited
US3735266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |