Patent US3798636A successfully refreshed from Google Patents.
US3798636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series-shunt switching pair, particularly for synchro to digital conversion, dc or ac analog reference multiplying or plural synchro multiplexing
Assignee: Gordon Engineering Co
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Filing: 1971-04-23
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Granted: 1974-03-19
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Expires: 1991-04-23
Abstract
Abstract In a multiplexing converter of synchro data to digital form, a plurality of switching devices, associated control logic, and a single analog comparator are provided for specifying the octant in which the synchro shaft angle is located. In a device, particularly for converting synchro data to digital form, for multiplying a DC or AC analog reference signal or for multiplexing plural synchro signals, a series-shunt switching pair is provided for presenting a constant impedance to a driving source in order to eliminate transients reflected back to the driving source when a variable impedance is presented to the driving source.
Inventors
- 👤 B Gordon
- 👤 L Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:19
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/64; H03M1/645
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
A device for switching voltage, said device comprising: a. input means; b. impedance means for changing an input voltage at said input means to a current; c. operational amplifier means having input and output terminals, a virtual ground presented at said operational amplifier means input terminal; d. output means; e. a first solid state switch, said first solid state switch having energized and deenergized states; and f. a second solid state switch, said second solid state switch having energized and denergized states; g. said impedance means serially connected between said input means and said first solid state switch, said impedance means and said first solid state switch connected at a first junction, said first solid state switch connected between said first junction and a ground; h. said second solid state switch serially connected between said first junction and said operational amplifier means input terminal, said second solid state switch and said operational amplifier means input terminal connected at a second junction; i. said operational amplifier means output terminal connected to said output means; j. said current switched to said ground when said first solid state switch is in said energized state and said second solid state swtich is in said deenergized state, said current switched to said virtual ground when said second solid state switch is in said energized state and said first solid state switch is in said deenergized state, whereby a constant impedance is presented at said input means.
Claim 2
Independent Claim
241 words
A device for switching voltage, said device comprising: a. input means; b. impedance means for changing an input voltage at said input means to a current; c. operational amplifier means having input and output terminals, a virtual ground presented at said operational amplifier means input terminal; d. output means; e. a first solid state switch, said first solid state switch having energized and deenergized states; and f. a second solid state switch, said second solid state switch having energized and denergized states; g. said impedance means serially connected between said input means and said first solid state switch, said impedance means and said first solid state switch connected at a first junction, said first solid state switch connected between said first junction and a ground; h. said second solid state switch serially connected between said first junction and said operational amplifier means input terminal, said second solid state switch and said operational amplifier means input terminal connected at a second junction; i. said operational amplifier means output terminal connected to said output means; j. said current switched to said ground when said first solid state switch is in said energized state and said second solid state swtich is in said deenergized state, said current switched to said virtual ground when said second solid state switch is in said energized state and said first solid state switch is in said deenergized state, whereby a constant impedance is presented at said input means.
Claim 3
Dependent Claim
22 words
The switching device as claimed in claim 1 including feedback means serially connected between said operational amplifier means input and output terminals.
Claim 4
Dependent Claim
30 words
The switching device as claimed in claim 1 wherein said first solid state switch is a field effect transistor and said second solid state switch is a field effect transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |