US3867699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transceiver switching circuit
Assignee: Boeing North American Inc
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Filing: 1973-12-14
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Granted: 1975-02-18
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Expires: 1993-12-14
Abstract
Abstract A switching circuit for use in a transceiver whereby a unidirectional mixer may be used for both transmitting and receiving. The circuit allows the combination of the high gain obtainable from unidirectional active mixers with the versatility of bidirectional operation.
Inventors
- 👤 C Daniel Stoffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:47
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
240 words
A transceiver switch for use with a single unidirectional mixer for both transmission and reception comprising, in combination: RF transformer means including a first winding and a center tapped second winding; IF transformer means including a first winding and a center tapped second winding; first logic means comprising first and second diodes connected to a first common terminal means whereby current flow through either of said diodes goes out said first common terminal; second logic means comprising third and fourth diodes connected to a second common terminal means whereby current flow through either of said third and fourth diodes is from said second common terminal means; means for connecting said first and second diodes respectively of said first logic means to first ends of said second windings of said RF and IF transformers, respectively; means for connecting said third and fourth diodes respectively of said second logic means to the other ends of said second windings of said RF and IF transformers respectively; means for connecting said first and second common terminal means to a unidirectional mixer; means for connecting said first winding of said RF transformer to RF signal circuitry; means for connecting said first winding of said IF transformer to IF signal circuitry; and means connected between the center taps of said second windings of said IF and RF transformers for supplying current therebetween in one direction for receiving signals and in the other direction for transmitting signals.
Claim 2
Dependent Claim
240 words
A transceiver switch for use with a single unidirectional mixer for both transmission and reception comprising, in combination: RF transformer means including a first winding and a center tapped second winding; IF transformer means including a first winding and a center tapped second winding; first logic means comprising first and second diodes connected to a first common terminal means whereby current flow through either of said diodes goes out said first common terminal; second logic means comprising third and fourth diodes connected to a second common terminal means whereby current flow through either of said third and fourth diodes is from said second common terminal means; means for connecting said first and second diodes respectively of said first logic means to first ends of said second windings of said RF and IF transformers, respectively; means for connecting said third and fourth diodes respectively of said second logic means to the other ends of said second windings of said RF and IF transformers respectively; means for connecting said first and second common terminal means to a unidirectional mixer; means for connecting said first winding of said RF transformer to RF signal circuitry; means for connecting said first winding of said IF transformer to IF signal circuitry; and means connected between the center taps of said second windings of said IF and RF transformers for supplying current therebetween in one direction for receiving signals and in the other direction for transmitting signals.
Claim 3
Dependent Claim
144 words
Apparatus as claimed in claim 1 comprising, in addition: third logic means comprising fifth and sixth diodes connected to a third common terminal means whereby currenT flow through either of said diodes goes out said third common terminal; fourth logic means comprising seventh and eighth diodes connected to a fourth common terminal means whereby current flow through either of said seventh and eighth diodes is from said fourth common terminal means; means for connecting said seventh and eighth diodes respectively of said fourth logic means to the first ends of said second windings of said RF and IF transformers respectively; means for connecting said fifth and sixth diodes respectively of said third logic means to the other ends of said second windings of said RF and IF transformers respectively; and means for connecting said third and fourth common terminal means to said unidirectional mixer.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |