US3870899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver protection circuit apparatus
Assignee: Boeing North American Inc
•
Filing: 1973-12-14
•
Granted: 1975-03-11
•
Expires: 1993-12-14
Abstract
Abstract A switching circuit for sensing the amplitude of input signals and deactivating a series switch to prevent application of high voltages to sensitive circuitry connected to the antenna input leads.
Inventors
- 👤 Cornelis Daniel Stoffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:14
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
357 words
Signal decoupling means comprising, in combination: apparatus input means for supplying an input signal; first transformer means including primary winding means for receiving a signal and tapped secondary winding means; voltage level sensing means, including input and output means, for providing in the alternative a first output when signals applied to said input means thereof are less than a predetermined value and a second output when signals applied to said input means thereof are greater than said predetermined value, said voltage level sensing means comprising from input means to output means, zener diode means, Schmitt Trigger means, switching amplifier means, and means connecting each of said above named means between said input means and said output means of said voltage level sensing means for providing said second output only when input signals are greater than said predetermined value; apparatus output means; means connecting said apparatus input means to said first transformer means and to said input means of said voltage level sensing means for supplying input signals thereto; secondary transformer means including tapped primary winding and secondary winding means; means connecting said tapped secondary winding means to said apparatus output means; diode means connected between the ends of said secondary winding means of said first transformer means and said primary winding means of said secondary transformer means, said diode means comprising, a first pair of diodes with common junctions connected together and the remaining junction of each diode connected to an end of said tapped secondary winding means and said tapped primary means, respectively, and a second pair of diodes similarly connected to the other end of each of said tapped winding means, and the connection of said output means of voltage level sensing means is to the common junction of each of said diode pairs; and means connecting said output means of said voltage level sensing means to the taps of said winding means of said first and second transformer means and to said diode means, said diode means permitting signal passage when said voltage level sensing means provides the first output and restricting signal passage when said voltage level sensing means provides the second output.
Claim 2
Dependent Claim
357 words
Signal decoupling means comprising, in combination: apparatus input means for supplying an input signal; first transformer means including primary winding means for receiving a signal and tapped secondary winding means; voltage level sensing means, including input and output means, for providing in the alternative a first output when signals applied to said input means thereof are less than a predetermined value and a second output when signals applied to said input means thereof are greater than said predetermined value, said voltage level sensing means comprising from input means to output means, zener diode means, Schmitt Trigger means, switching amplifier means, and means connecting each of said above named means between said input means and said output means of said voltage level sensing means for providing said second output only when input signals are greater than said predetermined value; apparatus output means; means connecting said apparatus input means to said first transformer means and to said input means of said voltage level sensing means for supplying input signals thereto; secondary transformer means including tapped primary winding and secondary winding means; means connecting said tapped secondary winding means to said apparatus output means; diode means connected between the ends of said secondary winding means of said first transformer means and said primary winding means of said secondary transformer means, said diode means comprising, a first pair of diodes with common junctions connected together and the remaining junction of each diode connected to an end of said tapped secondary winding means and said tapped primary means, respectively, and a second pair of diodes similarly connected to the other end of each of said tapped winding means, and the connection of said output means of voltage level sensing means is to the common junction of each of said diode pairs; and means connecting said output means of said voltage level sensing means to the taps of said winding means of said first and second transformer means and to said diode means, said diode means permitting signal passage when said voltage level sensing means provides the first output and restricting signal passage when said voltage level sensing means provides the second output.
Claim 3
Dependent Claim
357 words
Signal decoupling means comprising, in combination: apparatus input means for supplying an input signal; first transformer means including primary winding means for receiving a signal and tapped secondary winding means; voltage level sensing means, including input and output means, for providing in the alternative a first output when signals applied to said input means thereof are less than a predetermined value and a second output when signals applied to said input means thereof are greater than said predetermined value, said voltage level sensing means comprising from input means to output means, zener diode means, Schmitt Trigger means, switching amplifier means, and means connecting each of said above named means between said input means and said output means of said voltage level sensing means for providing said second output only when input signals are greater than said predetermined value; apparatus output means; means connecting said apparatus input means to said first transformer means and to said input means of said voltage level sensing means for supplying input signals thereto; secondary transformer means including tapped primary winding and secondary winding means; means connecting said tapped secondary winding means to said apparatus output means; diode means connected between the ends of said secondary winding means of said first transformer means and said primary winding means of said secondary transformer means, said diode means comprising, a first pair of diodes with common junctions connected together and the remaining junction of each diode connected to an end of said tapped secondary winding means and said tapped primary means, respectively, and a second pair of diodes similarly connected to the other end of each of said tapped winding means, and the connection of said output means of voltage level sensing means is to the common junction of each of said diode pairs; and means connecting said output means of said voltage level sensing means to the taps of said winding means of said first and second transformer means and to said diode means, said diode means permitting signal passage when said voltage level sensing means provides the first output and restricting signal passage when said voltage level sensing means provides the second output.
Claim 4
Dependent Claim
357 words
Signal decoupling means comprising, in combination: apparatus input means for supplying an input signal; first transformer means including primary winding means for receiving a signal and tapped secondary winding means; voltage level sensing means, including input and output means, for providing in the alternative a first output when signals applied to said input means thereof are less than a predetermined value and a second output when signals applied to said input means thereof are greater than said predetermined value, said voltage level sensing means comprising from input means to output means, zener diode means, Schmitt Trigger means, switching amplifier means, and means connecting each of said above named means between said input means and said output means of said voltage level sensing means for providing said second output only when input signals are greater than said predetermined value; apparatus output means; means connecting said apparatus input means to said first transformer means and to said input means of said voltage level sensing means for supplying input signals thereto; secondary transformer means including tapped primary winding and secondary winding means; means connecting said tapped secondary winding means to said apparatus output means; diode means connected between the ends of said secondary winding means of said first transformer means and said primary winding means of said secondary transformer means, said diode means comprising, a first pair of diodes with common junctions connected together and the remaining junction of each diode connected to an end of said tapped secondary winding means and said tapped primary means, respectively, and a second pair of diodes similarly connected to the other end of each of said tapped winding means, and the connection of said output means of voltage level sensing means is to the common junction of each of said diode pairs; and means connecting said output means of said voltage level sensing means to the taps of said winding means of said first and second transformer means and to said diode means, said diode means permitting signal passage when said voltage level sensing means provides the first output and restricting signal passage when said voltage level sensing means provides the second output.
Claim 5
Dependent Claim
217 words
Balanced RF signal decoupling apparatus compriSing, in combination: apparatus input means for providing RF input signals having a wide range of amplitudes; first transformer means including a primary winding and a center-tapped secondary winding having first and second ends; second transformer means including a center tapped primary winding having first and second ends and a secondary winding, the secondary winding providing apparatus output signals; signal amplitude sensing means, including input means and first and second output terminals for providing reversing polarity output signals between said output terminals as signals applied to said input means thereof pass through predetermined signal amplitude levels; means connecting said apparatus input means to said primary winding of said first transformer means and to said input means of said signal amplitude sensing means for supplying RF signal thereto; means connecting said first terminal of said signal amplitude sensing means to said center taps of said first and said second transformer means; four unidirectional current control means each having a first terminal thereof connected to said second terminal of said signal amplitude sensing means and each unidirectional current control means having a second terminal; and means connecting the second terminals of the four current control means respectively to the four ends of the center tapped winding means of said first and second transformer means.
Claim 6
Dependent Claim
217 words
Balanced RF signal decoupling apparatus compriSing, in combination: apparatus input means for providing RF input signals having a wide range of amplitudes; first transformer means including a primary winding and a center-tapped secondary winding having first and second ends; second transformer means including a center tapped primary winding having first and second ends and a secondary winding, the secondary winding providing apparatus output signals; signal amplitude sensing means, including input means and first and second output terminals for providing reversing polarity output signals between said output terminals as signals applied to said input means thereof pass through predetermined signal amplitude levels; means connecting said apparatus input means to said primary winding of said first transformer means and to said input means of said signal amplitude sensing means for supplying RF signal thereto; means connecting said first terminal of said signal amplitude sensing means to said center taps of said first and said second transformer means; four unidirectional current control means each having a first terminal thereof connected to said second terminal of said signal amplitude sensing means and each unidirectional current control means having a second terminal; and means connecting the second terminals of the four current control means respectively to the four ends of the center tapped winding means of said first and second transformer means.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |