US3567968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gating system for reducing the effects of positive feedback noise in multiphase gating devices
Assignee: Boeing North American Inc
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Filing: 1967-03-13
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Granted: 1971-03-02
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Expires: 1987-03-13
Abstract
Abstract A multiphase gating system which reduces the effects of positive noise normally present at the outputs of stages comprising prior art multiphase gating systems by providing switching means for clamping the outputs of particular stages previously set to a logical true level, to said level during the periods that the stage of the outputs of particular stages are being evaluated as inputs to other stages. If the outputs had been set false before the evaluation, the switching means would not be actuated.
Inventors
- 👤 Robert K Booher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:06
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/08; H03K19/094; H03K19/096; H04; H04B; H04B14/00; H04B14/02; H04B14/04; H04B14/044
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
282 words
A multiphase gating system comprising: a plurality of stages with each stage having an output and at least one input, the outputs of certain of said stages comprising inputs to others of said stages, stages; means for setting the output to either one of a true or false level as a function of the state of the inputs to that stage; means for clamping said output to a true level if it has been set to a true level by said means for setting and during the period that the output is being used as an input to other stages whereby the effects of positive noise feedback are reduced; said output including a first inherent capacitance which is either charged or discharged as a function of the state of the inputs; means for isolating said output from the inputs when the output is being used as an input to the other stages; said clamping means includes a switching device connected between said output and a true voltage level including a control electrode having a second inherent capacitance associated therewith, said capacitance being charged to either one of a true or false level as a function of the state of the inputs to the stage; and second isolation means connected between said control electrode and said inputs for isolating the control electrode and the second inherent capacitance associated therewith from the inputs when the output is being used as an input to other stages whereby charge on the second inherent capacitance turns the switching device on for resetting the output to said true level if positive noise feedback from said inputs to other stages increases the output voltage level above a predetermined amount.
Claim 2
Dependent Claim
282 words
A multiphase gating system comprising: a plurality of stages with each stage having an output and at least one input, the outputs of certain of said stages comprising inputs to others of said stages, stages; means for setting the output to either one of a true or false level as a function of the state of the inputs to that stage; means for clamping said output to a true level if it has been set to a true level by said means for setting and during the period that the output is being used as an input to other stages whereby the effects of positive noise feedback are reduced; said output including a first inherent capacitance which is either charged or discharged as a function of the state of the inputs; means for isolating said output from the inputs when the output is being used as an input to the other stages; said clamping means includes a switching device connected between said output and a true voltage level including a control electrode having a second inherent capacitance associated therewith, said capacitance being charged to either one of a true or false level as a function of the state of the inputs to the stage; and second isolation means connected between said control electrode and said inputs for isolating the control electrode and the second inherent capacitance associated therewith from the inputs when the output is being used as an input to other stages whereby charge on the second inherent capacitance turns the switching device on for resetting the output to said true level if positive noise feedback from said inputs to other stages increases the output voltage level above a predetermined amount.
Claim 3
Dependent Claim
243 words
A multiphase gating system comprising a plurality of stages with each stage having an output and at least one input, the output of certain of said stages comprising inputs to others of said stages, each of said stages comprising: a first field effect transistor having a control electrode; second field effect transistor means for unconditionally setting the output and the control electrode of said first field effect transistor to a voltage level during a first phase of the operation of said multiphase gating system, said second field effect transistor means including third field effect transistor means for conditionally resetting the output and the control electrode to a different voltage level during a second phase of the operation of said multiphase gating system as a function of the logical state of the inputs to a stage and for isolating the output and said control electrode from the inputs during a third phase of the operation of said multiphase gating system after the voltage level on said output and said control electrode have been conditionally reset during said second phase; and said first field effect transistor connected between said output and a reference voltage level for turning on as a function of a difference between the voltage level at the output and the voltage level on the control electrode of said field effect transistor for clamping said output to the reference voltage level during said third phase of the operation of the multiphase gating system.
Claim 4
Dependent Claim
243 words
A multiphase gating system comprising a plurality of stages with each stage having an output and at least one input, the output of certain of said stages comprising inputs to others of said stages, each of said stages comprising: a first field effect transistor having a control electrode; second field effect transistor means for unconditionally setting the output and the control electrode of said first field effect transistor to a voltage level during a first phase of the operation of said multiphase gating system, said second field effect transistor means including third field effect transistor means for conditionally resetting the output and the control electrode to a different voltage level during a second phase of the operation of said multiphase gating system as a function of the logical state of the inputs to a stage and for isolating the output and said control electrode from the inputs during a third phase of the operation of said multiphase gating system after the voltage level on said output and said control electrode have been conditionally reset during said second phase; and said first field effect transistor connected between said output and a reference voltage level for turning on as a function of a difference between the voltage level at the output and the voltage level on the control electrode of said field effect transistor for clamping said output to the reference voltage level during said third phase of the operation of the multiphase gating system.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |