US3656002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit
Assignee: United States Department of the Army
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Filing: 1970-11-24
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Granted: 1972-04-11
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Expires: 1990-11-24
Abstract
Abstract A switching circuit for providing maximum isolation between a radio frequency source and a load when the circuit is in a first operating condition and for delivering substantially maximum energy from said source to said load when the circuit is in a second operating condition, while presenting a substantially constant impedance to the source during both operating conditions, whereby the load is always matched to the source.
Inventors
- 👤 Russell A Gilson
- 👤 William F Kiss
- 👤 Vincent J Organic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:42
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/68; H03K3/00; H03K3/80
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
207 words
In combination, a signal stage receptive of an input signal from a radio frequency source and adapted to supply a load, said signal stage having an A-C reference potential and being disposed between said source and said load for isolating the input circuit of said signal stage from changes in load impedance, a pair of switching transistors disposed in the output circuit of said signal stage and operating in complementary switching conditions, and control means for reversing the condition of both of said switching transistors, said control means including means responsive to a control input at said control means for rendering conductive a first of said switching transistors for coupling the signal in the output circuit of said signal stage to said load through said first of said switching transistors, means coupling the output of the second stage to said reference potential said control means further including means for rendering conductive the second of said switching transistors during the absence of said control input at said control means to provide an essential short circuit to said load by shunting the signal in the output circuit of said signal stage through the second of said switching transistors during the absence of said control input at said control means.
Claim 2
Dependent Claim
207 words
In combination, a signal stage receptive of an input signal from a radio frequency source and adapted to supply a load, said signal stage having an A-C reference potential and being disposed between said source and said load for isolating the input circuit of said signal stage from changes in load impedance, a pair of switching transistors disposed in the output circuit of said signal stage and operating in complementary switching conditions, and control means for reversing the condition of both of said switching transistors, said control means including means responsive to a control input at said control means for rendering conductive a first of said switching transistors for coupling the signal in the output circuit of said signal stage to said load through said first of said switching transistors, means coupling the output of the second stage to said reference potential said control means further including means for rendering conductive the second of said switching transistors during the absence of said control input at said control means to provide an essential short circuit to said load by shunting the signal in the output circuit of said signal stage through the second of said switching transistors during the absence of said control input at said control means.
Claim 3
Dependent Claim
13 words
The combination according to claim 1 wherein said signal stage is a transistor.
Claim 4
Dependent Claim
36 words
The combination according to claim 1 wherein said first switching transistor is positioned in series with said signal stage and with said load and said second switching transistor is disposed in shunt with said signal stage.
Claim 5
Dependent Claim
25 words
The combination according to claim 1 wherein said switching transistors are connected as an emitter-coupled pair disposed in the output circuit of said signal stage.
Claim 6
Dependent Claim
13 words
The combination according to claim 4 wherein said signal stage is a transistor.
Claim 7
Dependent Claim
25 words
The combination according to claim 5 wherein the collector current of said signal stage transistor passes in alternative fashion through each of said switching transistors.
Claim 8
Dependent Claim
45 words
The combination according to claim 1 wherein said control means includes a control transistor having one diode portion only rendered conductive in response to the presence of said control input and the other diode portion only rendered conductive during the absencE of said control input.
Claim 9
Dependent Claim
30 words
The combination according to claim 7 wherein said first switching transistor during conduction of said one diode portion provides a signal conductive path between said signal stage and said load.
Claim 10
Dependent Claim
25 words
The combination according to claim 7 wherein said switching transistors are connected as an emitter-coupled pair disposed in the output circuit of said signal stage.
Claim 11
Dependent Claim
36 words
The combination according to claim 7 wherein said first switching transistor is positioned in series with said signal stage and with said load and said second switching transistor is disposed in shunt with said signal stage.
Claim 12
Dependent Claim
34 words
The combination according to claim 7 wherein said second switching transistor during conduction of said other diode portion provides a conductive shunt to said signal stage to isolate said input signal from said load.
Claim 13
Dependent Claim
30 words
The combination according to claim 11 wherein said first switching transistor during conduction of said one diode portion provides a signal conductive path between said signal stage and said load.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |